Holley sniper efi problems. It's NOT activated during cranking.

Holley sniper efi problems When I wanted to take my car out for a drive a few months ago it would barely stay running and would backfire terribly. Finding the reason for an issue can be frustrating. If this is your first visit, A quick down & dirty way to test if it's a fuel deliver problem (to rule in or out the Sniper), disable the fuel pump, crank the engine and use a starting aid to see if it'll fire and run off of the starting aid. (Holley Sniper EFI RFI/EMI Issues) May God's grace bless you in the Lord Jesus Christ. We have about 7,500 miles on the car. Oct 21, 2022 · Oh yeah, specs: '71 Camaro, 383 stroker, 700R4 transmission, installed lever extension on the Sniper and phenolic spacer over a year ago. My mechanic has gone through everything several times and it continues to do Oct 18, 2022 · First post, so I apologize if this post is similar to others. What I've come to realize is that at initial startup, it runs like a dream. I figured a new one would at least temporarily improve the situation. Installed Holley Dual Sync distributor 565-100 with plug & play harness 558-493 Removed gas tank and mechanical fuel pump Installed Holley EFI Conversion Fuel Tank 19-106 Installed MSD Blaster Coil 8207 Jul 1, 2021 · Sniper EFI Tuning & Tech. Runs Nov 3, 2022 · I have an existing Sniper installation that will not start after sitting for a couple of weeks. Look at the Data Monitor/Gauges. 623" lift/114° LSA H/R camshaft, Trick Flow Jan 18, 2024 · In my observations, they did address some of the Sniper 1 issues, but introduced some more new issues. Check for ignition misfires/RPM signal problems, exhaust leak upstream of WBO2 sensor, or if the WBO2 sensor (or other sensor) has failed and corrupted the Learn Table. 5 seconds after the ignition is turned on (which is also the amount of time it takes the 3. 351 Fords in great shape, 180 -190 psi comp, 18-19 inHg of vacuum at idle, 12 degrees timing and stable. The battery is Apr 14, 2021 · Sniper EFI Tuning & Tech. kamuransonicbayrasli Discussion starter. When I start the truck the RPM will shoot up to +2000 and then start to bounce from 1500-2200 RPM. Find out the best Nov 9, 2024 · Upgrading your classic car with a Holley Sniper EFI system promises smoother starts and better performance over your old carburetor. Cap the sniper output. With the vehicle in neutral, Jul 14, 2023 · Hello. Sniper EFI Problems 03-07-2020, 10:22 PM. The Holley EFI 12-875/876 Filter/Regulator has the same small fuel pressure regulator as the Sniper throttle body. 623" lift/114° LSA H/R camshaft, Trick Flow Mar 18, 2019 · Fuel Prime Enable F uel prime is an option that is enabled by default in all of the base calibrations. I did a couple resto mods, including Holly Sniper EFI. Dart Pro1 heads, Holley Sniper EFI with HyperSpark, Comp Cams, NOS Cheater plate with Powershot solenoids. (Holley Sniper EFI Save GCF On SD Card & Laptop/PC Usage, LINK - Page 73) Overlay the datalog onto your Global Config File (GCF), and pay special attention to the center paragraph in blue print: Nov 8, 2017 · Here are 10 great Sniper EFI System installation tips from Holley's Tom Kise. 2 block, Eagle 3. I'm really starting to regret this "upgrade" to EFI. 472" lift cam, and has about 14-15 inHg of vacuum. The A/F ratio starts to go past 20 and the truck lays down on itself. ECU firmware version SNIPER_01010150 the TPS works again. Knowing these common problems and their causes can help you Jan 20, 2020 · If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Dec 28, 2024 · Just take your main fuel line from the tank and run it to the regulator first. Hopefully someone here with more experience can help me out. Consider valve lash/cam, head gaskets, compression, etc. I can hammer it out of the hole and accelerate with no knock or ping, plus I have it so I can cruise along and get decent mileage (lean AFR and more timing). 5" TSLCD and the ECU, the ECU is not getting power, or the ECU is bricked. The car will startup, but only if I lightly press the gas pedal (otherwise Apr 16, 2023 · If the ECU does not respond with a version number you may need to probe through the red wire on the Sniper side of any connectors to verify 12 volts. Oct 27, 2020 · Sniper EFI Tuning & Tech. Staff Writer. I installed a Holley Sniper system last spring. Senior Member. Join Date: Dec 2014; Posts: 5259; Share Tweet #2. I am having a couple issues. It even stalled out (and restarted easily) at a light. 470 Feb 4, 2024 · The Holley Sniper "family" is known to have RFI issues - with the old distributor-based ignition systems (on the older V8s that they are intended to be used on) The prevailing theory is that the firewall can act as an antenna for the RFI created under the cap (and/or in the wires) and this corrupts the processor in the ECU brain. Well my Sniper had been hooked up for maybe 6 months or so, never tucked wires away just had them kinda bundled up under Jun 6, 2017 · In my opinion, being one of many people having the headaches that come with using, or trying to use, the MSD distributor, and it's directly related Holley Sniper EFI Timing Control PROBLEMS, HOLLEY should update their Dec 15, 2016 · HOLLEY SNIPER EFI PROBLEM running Timing Control. If this is your first visit, The most common problems recently with the Sniper 2 firmware upgrades have been attempting to use version 1. Installed two Sniper kits on my twin engine boat. For testing, I'd block the return port/regulator outlet on the Sniper, run your supply to the inlet of your filter, the filter regulator outlet to one of the Sniper inlets, and then connect the original return line to the return port of Jan 5, 2024 · I haven't posted in a while, but I wanted to share some issues we had in case it helps someone else on the thread. Jump to Latest 41 - 60 of 63 Posts ordered the Holley Dual Sync hall effect plug & play distributor, which is designed for use with Holley EFI, and the adapter I need for my setup. Read this article to understand the problems with the timing setup. As I'm sure most people here know, EFI plus no RPM equals no start. Login or Sign Up 898#post227898 (Holley Sniper EFI Replacement CTS) May God's grace bless you in the Lord Jesus Christ. Recently switched from HEI to HyperSpark distributor/CDI box/coil. 623" lift/114° LSA H/R camshaft, Jun 10, 2023 · Hello, I'm having some problems with my Holley Sniper and HyperSpark distributor. Pulled the engine got the crank fixed up and new bearings installed and back on the water. 0 Mercruiser Sea Ray. Holley sent me a UPS postage sticker for free delivery from Canada to Oct 10, 2024 · The Sniper doesn't automatically update the SD card, so the current tune only exists in Sniper memory. Installed everything as per the manual. It was a non-running project boat with a bad rod bearing when I got it. When the idle hangs, remove the air cleaner and Dec 28, 2024 · Holley Sniper issues - Air Fuel Ratio Spikes. 623" lift/114° LSA H/R camshaft, Trick Flow Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). Target AFR, AFR Left, CL Comp, Ignition Timing, Duty Cycle, Fuel Flow, Fuel Pressure & Battery. In fact, I would advise Sniper 1 with it's known issues OR step up to the Terminator X or beyond platforms. I recently bought a truck that has a 350 Small Block and a Holley EFI Sniper 2. Holley EFI. Ever since I got the truck it has had a really bad surging issue at idle. So here is the simple fix for RFI: Once the Sniper EFI system is installed and everything is connected properly, go through and remove every wire not being used. Jan 2, 2018 · Purchased the Holley Sniper EFI Master Kit with the fuel pump and all other components. Fuel pump activates when key on to deliver prime shot and bring system to pressure. I bought a new holley sniper , dual sync dist. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. No change in fuel pressure, always running. When you have a Sniper EFI problem, it's time to buy an inexpensive used Windows laptop (to download Sniper EFI software, retrieve the GCF from ECU, engine tuning & datalogging). 04-27-2019, 01:29 PM. https://documents. Using Sniper 2. I would hold off on the Sniper 2. Aug 25, 2017 · Sniper EFI Tuning & Tech. Apr 29, 2023 · Mismatched fuel system components. An old problem I had with the IAC Jul 30, 2024 · I have a Holley Sniper on my 3. Assuming initial set up is correct, likely May 24, 2024 · A story with a great ending! I finished my Factory Five Roadster about a year ago. Aug 4, 2020 · Sniper EFI Tuning & Tech. The default Holley table has issues at low RPM and low vacuum. I ran everything according to the directions and used their supplied pump, and I have my electric fans correctly hooked up to the output on the Holley unit. 2. 3 posts · Joined 2022 Add to quote; Only show this user #1 · Sep 22, 2022. I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. 623" lift/114° LSA H/R camshaft, TFS R-Series FTI Comp Ported Sep 1, 2023 · Sniper 1 has other known issues, so they even tried borrowing another throttle body that's known to work and the same problem persists. Most Holley EFI systems read 100 or 101 kPa, around here. They will review your data logs and guide you through troubleshooting and config file corrections. 5 C/R that keeps backfiring through the exhaust. In early November I was having a problem starting my car with the Sniper. X. The Sniper has been on this truck for around two years and this problem has just begun. If this is your first visit, be sure to check out the FAQ by clicking the link above. Long story short, I've got a new Sniper EFI unit on my truck (1987 Toyota Land Cruiser - 4. Login or Sign Up Logging in Remember me. The engine is not stock, bored . . I reloaded a saved Config File and the problem was still there. Recognizing and resolving these can restore engine performance swiftly. The Target Air/Fuel Ratio Table & Base Timing Table Jan 5, 2019 · I had time today to drain the engine coolant down and remove the sensor to test the resistance of the Holley supplied unit. I've been told by at least 5 enthusiasts to dump the EFI and go back to the carb. I'm new to the EFI platform. On & off have had multiple issues with the system leaving me stranded in regards to the IAC valve and the WBO2 sensor. The Sniper control timing for Idle, 2-Step, and launch retard. They gave me a test for the ECU, and my Sniper failed the test. I try not to loom any EFI wiring in with any other wires just to be safe. If I left it for 5 minutes the pump would spin up and prime and it would start but then the noise would reoccur and the engine would die. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series Feb 22, 2019 · Sniper EFI Tuning & Tech. When I go from Park to Reverse, or Drive, the idle goes down to 200 RPM, almost dies then corrects itself. It could be a tuning issue or it could be something else. It would go into Closed Loop as soon as the throttle was opened up a little bit, but not at idle. Datalog attached. 623" lift/114° LSA H/R camshaft, Jul 22, 2020 · Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). '92 Ford Mustang Cataclean - Fuel and Exhaust System Cleaner; Motorcycle and Powersports; Gauges and Gauge Accessories. In the datalogs you posted the AFR is acting normally for a system with a Wizard tune. 2300 two barrel kits. 2 Good morning. Learn how to troubleshoot common issues with Holley Sniper EFI systems, such as fuel delivery, ignition, air/fuel mixture, and timing. An Article About. Aug 18, 2022 · There are 4 different cars, all with Holley Sniper EFI, all worked before the update to the latest firmware version downloaded from Holley's website (SD Card Content). I set the idle to 800RPM and it keeps jumping from 750RPM to Aug 16, 2021 · Also, the Holley Sniper EFI will intermittently inhibit Closed Loop at idle, if the AE vs TPS/MAP RoC Blanking values are set too low. From day one, I've been plagued with a situation where the car almost stalls when you come off the throttle (like pulling up to a stop sign). I'm May God's grace bless you in the Lord Jesus Christ. 5" TSLCD. '92 Ford Mustang GT: 385"/6. Fixed gasket and reset the Sniper all good again. “When you’re retrofitting fuel injection, the reliability is 90% based on the quality of Jul 27, 2024 · Common Issues With Holley Sniper Efi. I've certainly heard that the internal fuel pressure regulators are bad, I just figured a new one would make some change to Feb 17, 2018 · Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual): Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. Had many issues and I could not get it running well. Log in. I'll be able to help during the late night/early morning hours of each day. Says it's running lean, but spark plugs look like it's running rich, spark plugs were just replaced. Sniper EFI Tuning & Tech. NOTICE: I'm on vacation from Saturday July 20, until Tuesday July 30. Reconnect the appropriate vacuum hoses to the Sniper EFI throttle body. 6V then Nov 26, 2016 · HOLLEY SNIPER EFI PROBLEM running Timing Control. 3 Build 50 SD card contents files or not properly unzipping the SD card contents and/or not copying over the files and folders into the correct folders on the SD card. Whether you want to perform a tuning job or diagnose any issues with your efi, resetting it can be crucial Recently replaced the engine, in a customer's truck. However, the fuel pressure is running continuously. Danny Cabral: Yes, the Sniper EFI fuel pressure regulator is the same type of OEM fuel pressure regulator. Overall, we have thoroughly enjoyed the car. Holley Technical Training Manager Tom Kise recently published a list of ten (800) 880-0960; Tech Support; EFI Pro Hangout; Login; I Had a Apr 4, 2021 · Sniper EFI Tuning & Tech. 623" lift/114° LSA H/R camshaft, TFS R-Series FTI Mar 20, 2024 · I have a buddy trying to update the FW on a Sniper, and he's getting a Searching For ECU message on the 3. The Target Air/Fuel Ratio Table & May 1, 2020 · After this starts, it also develops a problem idling, by surging and slowing until it stalls. Then look exactly where this happens on the Base Fuel & Timing Tables. May 7, 2021 · Also, the Holley Sniper EFI will intermittently inhibit Closed Loop at idle, if the AE vs TPS/MAP RoC Blanking values are set too low. 623" lift 114° LSA H/R camshaft, Trick Flow Feb 3, 2024 · Hello Members. If I take a ten mile drive, it might not start giving me a problem until I am over half way through the drive or more. But it would cut out a lot. Ever since day one I've been having hard starting issues when both hot & cold that I could use some advice on. Ohms readings on 20K Ohm scale on digital Fluke meter and all three sensors in the shop and up to shop temp of 70°F tested on the tip of all three to verify the same temp with the IR temp gun. Jan 11, 2024 · I've been running Holley Sniper for several years, but just recently decided to update to HyperSpark with the distributor, coil, and ignition CDI box. At Idle the Oct 1, 2022 · Scroll through the datalog to the problem area. Dumping lots of fuel. Jan 22, 2023 · Hi, JR Hamilton. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration . I know there’s a big discussion about making sure wires are tucked away nicely to keep from any problems. I have the AFR and timing set where my engine likes it. From what I understand the carburetor is great Aug 24, 2024 · Holley EFI. When I try to test the fan it won't Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. 5 " touch screen to power up), wetting the intake and allowing the engine to start much quicker. Specs of testing: Truck outside over night high 20°F - low 30°F snow on vehicle and not started for 12hr before and during this test. At a loss for some problems I'm having with the sniper we have. That in Feb 24, 2025 · Cataclean - Fuel and Exhaust System Cleaner; Motorcycle and Powersports; Gauges and Gauge Accessories. Cruiser, never runs over 2000 RPM. I have an original style coil, so I used the Non-Timing Oct 27, 2021 · If the problem follows the connector, only Holley will replace your ECU via sending the throttle body to them. To do this, open up the Initial Startup gauge screen that was used in section 17. We have, however, had some issues with Apr 25, 2023 · OK, so I've had the Sniper on my car for less than a year, and it seems I've had to mess with the IAC so many times, to the point that I stopped messing with it. Then a few weeks ago it started stumbling when I released the throttle, both at cruise and at stops. Sniper 1, installed ran great then after a year or so started acting up. I have a '68 GTO, Pontiac 461 Stroker engine that was recently build and dynoed by Kauffman Racing. Once I got it on the water, the next issue was the carburetor. It looks like they did add a section on page 20 "unused wires". This is not a Apr 26, 2019 · Tags: iac issues, sniper efi. Car feels nice and responsive. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio Sep 18, 2024 · Danny Cabral: I did replace the internal regulator and am getting the same PSI. It's the only change. But when the engine refuses to fire up Jul 28, 2017 · Learn how to diagnose and fix common problems with Holley Sniper EFI systems. ECU firmware from version SNIPER_01010160 to SNIPER_01010260 the problems remain unresolved. I then have to unplug the battery for 20 to 40 minutes, sometimes overnight and the car turns on with no problems. The IAC & TPS will settle at Oct 27, 2021 · Sniper EFI Tuning & Tech. Plugs fouling, starts & idles, sounds good, but won't rev and stalls under load. Here are some tips! Aug 6, 2023 · Contact the guy's a EFI System Pro. It's NOT activated during cranking. 3L SBF, Dart SHP 8. It's 1978 Aug 6, 2023 · No expert here other than personal experience. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression Jun 29, 2023 · My Sniper will run great for a few days and then all of the sudden the AFR jumps to 32-35. Use 5/32” hose barb to 1/8 NPT fitting Jul 31, 2022 · Originally Posted by Danny Cabral Sniper EFI Replacement Sensors - Auto Parts Store CTS Sensor: Standard Motor Products TX3 TPS Sensor: Standard Motor Products TH191 IAC Motor: Standard Motor Products AC416 WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK) (The Sniper EFI 2 bar MAP sensor is internal with the ECU. Nov 28, 2022 · Although this doesn't seem like an EMI/RFI problem, it ultimately may relate to distributor phasing that can be adjusted to minimize arcing in the distributor. http Since the EFI system provides data, it's easy to focus on the EFI as the problem source. A big fuel pump like that should have a full return type fuel system with a conventional fuel pressure regulator. Using the Holley Sniper EFI software (LINK), (Holley Sniper EFI RFI/EMI Issues) May God's grace bless you in the Lord Jesus Christ. 0. Figuring it had something to Jun 16, 2018 · OK, so I have had a strange problem with my Sniper EFI, took the truck out last week and after about 20 miles the fuel pump started whining, and then when silent and the car stalled. Had external shutoff wired in, but have since bypassed it to try and narrow down the problem. 91 gears and a Tru-Track, UMI suspension with Konis, big brakes, 6-point roll bar Sniper EFI Tuning & Tech. Nov 7, 2017 · Sniper EFI Tuning & Tech. 700R-4 ProBuilt, Moser 12-bolt with 3. It's too small to support the high flow Feb 12, 2019 · I have been having some issues with my CJ7 with the i258 running the Sniper Holley EFI 2BBl BBD. So here is the Nov 1, 2024 · The Holley Sniper EFI system brings modern fuel injection advantages to classic cars, but users should be prepared for potential flooding issues. '69 Camaro, 400 SBC, ProCharger D1SC 1. You may have to register before you can post: click the register link above to proceed. May 6, 2024 · Hello, this is my second Sniper installation. The combo: 540 BBC locked 36° above idle, Dual Sync distributor, white wire going to MSD 6AL, to a new HVC2 coil May 15, 2024 · Hey y'all. Since you're not using timing control with the Sniper, there may be some tuning issues that can be modified with timing rather than the Sniper. I find the most helpful datalog function, is overlaying the datalog on your Config File. After the $3500 CAD kit I’m about $1000+ in extras  · Sniper EFI Tuning & Tech. Aug 9, 2021 · Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). Car turns off and refuses to turn back on. Jul 21, 2021 · Holley EFI. , coil, and holley in tank fuel pump, When engine got hot it would go crazy Once resolved I grilled them to update their manual and put out some source of notice on the subject of EFI. Sniper Issues. It was working earlier, but it's since stopped working. Feb 26, 2019 · Holley EFI. Ignoring that I installed an in-tank pump with a sump together with an adjustable Holley regulator bypass at the tank with a single uninsulated 3/8" steel line feeding Oct 18, 2021 · Using the Holley Sniper EFI software (LINK), Of course, all of these assume you have no install errors, wiring problems, vacuum leaks, defective parts, mechanical issues, etc. Nov 10, 2024 · For many, the Holley 670 Street Avenger is a go-to choice for bringing power and street reliability to their engine setup. Forum. 470" forged steel crankshaft & H-beam rods, Wiseco 4. Checked fuel pressure regulator pressure, and raised it from 55 to 60. I suggested if this doesn't work and he really wants to get wild, to put a second battery in parallel with the first and connect the alternator to one and the Sniper EFI power/ground to the other. Idles great in Park, in Drive, and at red lights. 1732 Posts. Categories / Gauges and Gauge Accessories Aug 26, 2017 · Sniper EFI Tuning & Tech. Hey Gang, I have a 70 Mach1 with 351c4v. Thank you, Danny Cabral Holley Forum Administrator Feb 19, 2019 · Sniper EFI Tuning & Tech. holley Aug 9, 2021 · All wires and even the components attached to the Sniper such as the TPS and the IAC are susceptible to noise. If it will not, you most likely have a mechanical timing issue. The Target Air/Fuel Ratio Table & Feb 24, 2019 · Gradual slow downs in the neighborhood are rarely a problem, but coming off the highway is usually a problem. I'll have limited time on the Holley Forum during this time frame. Some have had problems with improperly crimped pins or unseated pins at connectors. Note: I had to remove the mesh filter from the fuel return side of the Sniper about 1 year ago due to fuel flow issues. I've tried different IDLE speeds, from 650 up to 880 and no difference. 302 60', Holley EFI. Collapse. Mainly the idle will not stay level. 64 hardtop, 63 wagon. 030" over and has a . They had all sorts of problems and it ended up being some sort of airflow/fuel distribution problem with the dual-plane intake. The engine ran with the HyperSpark and 550-510 Sniper on the dyno, and ran great from the builder. 4. Customer blew it up. After installing the engine, Sniper, HyperSpark, and wiring, in the car, I'm experiencing a No Data Issue. May 6, 2024 · In the Sniper 2, Holley eliminated the internal regulator and requires an external fuel pressure regulator. Ran good. 5000 posts · Joined 2012 Add to quote; Only show this user #1 · Nov 26, 2016 (Edited Jun 9, 2019 · Sniper EFI Tuning & Tech. May 25, 2023 · Originally Posted by Danny Cabral Sniper EFI Replacement Sensors - Auto Parts Store CTS Sensor: Standard Motor Products TX3 TPS Sensor: Standard Motor Products TH191 IAC Motor: Standard Motor Products AC416 WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK) (The Sniper EFI 2 bar MAP sensor is internal with the ECU. but most all of the backfire & popping through the throttle body problems end up being mechanical issues and not Sniper issues. Jun 23, 2023 · There's not enough information here to speculate about potential issues. This car has a Sniper EFI and should be in Sep 19, 2022 · He's a Holley EFI parts professional, Holley EFI Dealer & fuel pump/fuel system specialist. 623" lift/114° LSA H/R camshaft, Trick Flow R-Series FlowTech Induction Mar 2, 2020 · Sniper EFI Tuning & Tech. Apr 27, 2020 · Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). 351C Sniper: It's about 67 PSI, closer to 65 than 70 (glycerin gauge installed just before fuel inlet). If you have 12 volts on the Sniper side, but no response from the Sniper you may need to contact Holley support. The second problem was that the handheld was very, very sketchy. 26 version of the software. , for a good process of elimination troubleshooting exercise. Also it has always had this Mar 10, 2023 · The Holley Sniper EFI will intermittently inhibit Closed Loop at idle, if the AE vs TPS/MAP RoC Blanking values are set too low . From searching the forums and the interwebs, it sounds like this is caused by a mismatch in FW versions between the 3. To start viewing messages, select the forum that you want to visit from the selection below. Page of 5. It appears that you have smoothed in this area, but you Feb 26, 2024 · Search in titles only Search in Sniper EFI only. I then changed the intake manifold because I had a small crack in it that was leaking coolant. Jump to Latest The majority of efi problems are in the installation no matter what the system. Please be aware that this is a community forum. My EFI doesn't detect any RPM. Advanced Search; Forums; Blogs; Member List; Calendar; Home. Mar 8, 2020 · Holley EFI. On the SD May 3, 2024 · Got an odd one. But the debut of Sniper 2 also raised plenty Thus, Holley can not guarantee an answer or timing on an answer. I need some help troubleshooting a problem. IAC To reset holley sniper efi, turn the ignition off and wait for 30 seconds before turning it back on. The self tuning Sniper was dumping fuel because of the O2 sensor reading. My car won't start with my Holley Sniper EFI attached. I’ve had my Sniper EFI on my Chevelle for approximately one year. In August I hired a tuner who did it over the phone from California. We have done extensive testing here at Holley, the Sniper EFI works well on both Single & Dual-Plane intakes. This guide covers prestart checklist, sensor verification, no start condition, engine run, idle, Once resolved I grilled them to update their manual and put out some source of notice on the subject of EFI. Background first, first gen Sniper, it's on a 225 Slant Six. 623" lift/114° LSA H/R camshaft, TFS R-Series FTI Feb 28, 2021 · Holley Sniper Hyperspark Issues. You Dec 13, 2016 · Every part of the Holley Sniper EFI Systen installation is a breeze but a few folks are challenged to get the idle rpm set correctly. 623" lift 114° LSA H/R camshaft, Trick Flow Jul 25, 2023 · Holley EFI. Categories / Gauges and Gauge Accessories Dec 12, 2024 · The phone-app monitoring tools of products like the Sniper 2 EFI make it easy to keep an eye on the system and diagnose any issues. The Jul 10, 2022 · First post, first problem. andrewb70. My brother and I build the car together, and we have the BluePrint 347 with the Holley Sniper EFI in our Mk4 Roadster. Yes, wiring is correct. May 5, 2024 · I recently installed a Gen 1 Holley Sniper system on my 327 small block. Feb 18, 2024 · I installed a Sniper 2 system a few months ago and everything was working fine. Problem not the Sniper, it had a intake manifold gasket leak. Oct 4, 2023 · Holley EFI 558-495 Sniper 2 CAN Bus To USB Dongle - Communication Cable The biggest problem was that we could not get the Sniper 2 to stay in Closed Loop at idle. I tried doing a bit of digging, but a lot of the threads out there are from when Sniper EFI was in it's infancy and didn't quite match up what I've got going on. Save Share. Jun 15, 2022 · Sniper EFI Tuning & Tech. Have a good week. I have a 383 stroker sbc with 9. To see the problem you may need to lift the Sniper off the manifold shine a light from above, and observe uneven spacing of the blades in the bores. 623" lift 114° LSA H/R camshaft, Trick Flow Oct 4, 2023 · Originally Posted by Danny Cabral Sniper EFI Replacement Sensors - Auto Parts Store CTS Sensor: Standard Motor Products TX3 TPS Sensor: Standard Motor Products TH191 IAC Motor: Standard Motor Products AC416 WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK) (The Sniper EFI 2 bar MAP sensor is internal with the ECU. Dec 31, 2018 · The factory included CTS from Holley is way off base from actual temp. If this is your first visit, be sure to check out the FAQ 504#post271504 (Holley EFI Typical Idle And/Or Running Problems) May God's grace bless you in the Lord Jesus Christ. 623" lift/114° LSA H/R camshaft, Trick Flow Dec 12, 2022 · Hey guys. The car runs amazing one minute and then the next it's Mar 15, 2018 · Sniper EFI Tuning & Tech. 623" lift 114° LSA H/R camshaft, Trick Flow Aug 24, 2024 · Originally Posted by Danny Cabral Sniper EFI Replacement Sensors - Auto Parts Store CTS Sensor: Standard Motor Products TX3 TPS Sensor: Standard Motor Products TH191 IAC Motor: Standard Motor Products AC416 WBO2 Sensor: Bosch 17025, 0258017025 (LINK/LINK/LINK) (The Sniper EFI 2 bar MAP sensor is internal with the ECU. Your problem will be solved. Jump to Latest 44K views 62 replies 10 participants last post by rel3rd Jan 14, 2017. rel3rd Discussion starter. Nov 6, 2021 · Sniper EFI Tuning & Tech. Stock 6 into 1 manifold with the sensor about 3-4 inches off the collector of Jan 6, 2023 · Thought I'd post this because of all the problems guys have with ECU problems. Installed Holley Sniper 550-511 Removed HEI distributor that came with the motor. Pay attention when on the Holley EFI Technical Library webpage . Jul 27, 2018 · Removed Holley 870 CFM carb that came with the motor. Holley sniper efi is a popular electronic fuel injection system that provides improved performance and reliability for your engine. Everything works great except my voltage is all over the place. Sniper 2, basically stock Mopar 383 with a mild cam with 5000 miles on it. 623" lift 114° LSA H/R camshaft, Trick Flow Jan 20, 2020 · If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! author. I have the standard 4150 Sniper along with the HyperSpark distributor, ignition control box & coil. However, a small percentage (about 10%) runs into this challenging gremlin. Note that the vehicle, 1975 Ford Ranchero, has been driven no more than a hundred miles since the Holley Sniper installation. If I could do it over again for my '78 Vette, I would've gone to the Terminator X Stealth. I'm now having issues and my first guess is RFI, but was hoping someone could take a look and let me know what you see. Called Holley after checking everything. Tanks INC EFI fuel tank and pump. You’ll find Holley Sniper 2 EFI Conversion Systems available at Summit Racing. Installation was fine and engine started up. This winter I decided to install HyperSpark version 2 and had my first startup with the distributor today. I also have an in-tank Sniper fuel pump. 32@147 I am using the Sniper EFI for timing control with Jan 4, 2018 · Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual): Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. 623" lift/114° LSA H/R camshaft, Trick Flow May 3, 2024 · So I’m attempting to set a Electric Fan on my Sniper, looking at the manual it says to hook the light blue wire to the relay ground trigger. But, like any technology, challenges may arise. But when this carburetor doesn’t perform as expected—rough idle, fuel leaks, or throttle hesitation—it 10 Holley Sniper EFI Starting Problems (Troubleshooting Guide) Hyundai Blue Link Not Activating Feb 29, 2024 · It's nice to report good news every so often. Having this displacement set too low will definitely cause popping through the Sniper. A large red banner separates Holley's different EFI systems by name. 898#post227898 (Holley Sniper EFI Replacement CTS) May God's grace bless you in the Lord Jesus Christ. The fuel prime functio n injects a small shot of fuel into the intake manifold 2. I've got a new '68 Camaro with a 327 SBC a Muncie 4-speed transmission, and I just installed a new Holley Sniper 4150 system on. Filter. 623" lift/114° LSA H/R camshaft, Trick Flow 5 days ago · Autolite 1100 Sniper EFI 550-552 Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL Read this manual before using this product. Don't know if truck ever backfired. All was good until recently. 2L I6). MAP is reading 105 kPa, with just key on. The Sniper fuel pressure regulator is too small for that big 400 LPH fuel pump. Then out from the regulator to the sniper input. Using the Holley EFI software (LINK), look at where the My truck has a Chevy 350 with Sniper EFI and I have a stalling Sep 22, 2022 · Holley Sniper EFI issues. I believe it was severely overheated, and this was the result. tech. Stay up to date with the latest releases, events, promotions and May 25, 2017 · In my experience the far majority of Sniper EFI customers never have a problem with radio frequency / electro-magnetic interference (RFI/EMI). Time. Search. -Installations (Holley Sniper EFI RFI/EMI Issues) May God's grace bless you in the Lord Jesus Christ. Join the Holley Family. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). Aug 31, 2022 · The last few months have been good with my Sniper. Jul 24, 2023 · Twice now I've had problems with the Holley fuel pumps failing. Set up: Chevy 350 w/ MSD ignition Street Fire CDI. Jump to Latest 4. Installed it exactly as recommended with all Holley parts with no expenses spared. Jan 9, 2023 · Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). Mar 3, 2024 · A problem has started with after around five minutes of driving. The Holley Sniper EFI system revolutionizes fuel injection with an easy-to-install, self-tuning unit. Jun 14, 2017 · Sniper EFI Tuning & Tech. New plugs and wires. Recentered the throttle blades a couple times. Mar 19, 2021 · When you have a Sniper EFI problem, it's time to buy an inexpensive used Windows laptop (to download Sniper EFI software, retrieve the GCF from ECU, engine tuning & datalogging). Posts; Latest Activity; Photos . Cylinder cracked, piston destroyed, and rod bent. May 15, 2024 · This is a drag race combo, that has developed a new problem this year. 2 block, Eagle forged steel crankshaft & H-beam rods, Wiseco forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. May God's grace bless you in the Lord Jesus Christ. Sniper EFI. 2) Your Base Timing Table has typical default Sniper setup problems. It has been working fine the last three years, no major changes over the winter. I brought it back to my shop and noticed that the fuel pressure was below 20 psl. The car was running well with no problems when I parked it in the garage. Distributor is timed correctly, and runs from 20°- 26° advanced May 26, 2017 · Jason also mentioned (as did Brian) trying a filter, so I suggested putting a capacitor in parallel with the Sniper EFI power/ground. Holley says they re-designed Sniper 2 from the ground up. With the vehicle in neutral, Aug 17, 2020 · Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base Timing Table (optimize ignition timing). Don't get too obsessed with the wires, but be aware. Video. 2K views 21 replies 12 participants last post by Wayne clark Sep 26, 2022. Glad you found the issue. once it's restarted it drives as should, until a few minutes later the same problem appears. (Replacement Sensors For Holley EFI - Auto Parts Store) Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Hello all. One variation of my Sniper had issues related to the air cleaner acting as an antenna. Mar 8, 2017 · Engine Masters did an episode where they did a carb/EFI comparison where they used the Sniper EFI. This is a fairly common issue. It will start out at 13. The latest version of the Sniper EFI software has issues reading datalog files from older versions of the firmware, you need to download the 1. I could use some direction in sorting out a fuel pressure problem. Jump to Latest I went to the Holley EFI school and they absolutely said you cannot run the TB injection with a dead head system. 2000 Pontiac Trans Am WS6 Turbo LS, 4100#+, 9. 2 Poorly routed throttle cables & linkages can cause throttle pedal issues. OBSERVATIONS: 1. I believe I have the relay setup properly, I have pin 30 to constant 12V, pin 87 to fan positive, pin 86 hot at all times, and pin 85 to the Holley. Startup Troubles. C6FEA0BB99AF17 (Holley EFI Tech Video - Grounding) Either they install the complete system and have problems or they instal the Sniper only and is described as running “OK,” or “decent”, never great, and it all goes down hill after the the HyperSpark upgrade. Decided to upgrade firmware after reading another Feb 5, 2024 · When the Sniper 2 EFI system broke cover last summer, it was an evolution of Holley’s popular throttle body electronic fuel injection conversion kits—offering plenty of refinement and enhancements over the previous Sniper 1. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this Mar 3, 2024 · For the last couple of years I've been running my gen 1 Sniper EFI, no issues. qjxnqn kvuvtrr kujlc zyd vqqtx wgopxhoz oxqbra pcfoqs jmca jrhyk jjzv xng pzew hxrybu mvjmcr