Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. Holley EFI Oxygen Sensor Replacement Sniper and Terminator X O2 Sensor Part # 554-155 2 Reviews In Stock Free Shipping - Lower 48 US States Your Price $132. The top cause is excessive fuel. OXYGEN SENSOR INSTALLATION WARNING! Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an. If the O2 cable has melted it is not something fixed under warranty and will require the unit to be sent back to Holley to be repaired at customer cost. If you suspect that your Holley Sniper EFI is having fuel delivery issues, there are a few things you can check. If you used the strap on bung that came with it check the gasket. Then when I started it a couple of days ago it ran rough and the handheld showed AFR at 35+. Sniper EFI Problems 06-04-2017, 03:17 PM Hey all. Holley Sniper - Oxygen Sensor Location Thread starter GA Architect; Start date Nov 22, 2019; Content may include affiliate links. Holley Sniper O2 Sensor ProblemsThe owner is frustrated because the engine is running way too rich, fouling plugs, and generally runs poorly. Next, check the fuel filter to see if it needs to be replaced. Also, while I have the laptop EFI software I havent used it and dont know how. Thoroughly inspect the WBO2 sensor circuit for misinstallation, possible cut or burnt wires. Best Aftermarket EFI Systems (Review & Buying Guide) in 2023. The reason it’s important to know how a WBOS works is because there are several conditions that can fool an oxygen sensor into thinking that the engine is running lean. Discussion Starter · Jul 2, 2013. 35+ AFR, replaced WBO2 sensor, same problem. Sniper EFI Problems 06-04-2017, 03:17 PM Hey all. Holley Sniper O2 sensor replacement. After about 15-30 restarts, the engine is now running excessively rich and yet the O 2 sensor still detects free oxygen present in the exhaust. Sensor Diagnostics and Statuses. Bad Oxygen Sensor? Holley NTK - YouTube This car runs on methanol, and at the track the last couple outtings the car was misbehaving and reading really rich. The first situation is actual. On EFI systems such as Holleys Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. I reloaded the last Config File and also went through the initial setup. After the external inspection, pull the WBO2 sensor and visually inspect it, maybe it fell apart. After about 15-30 restarts, the engine is now running excessively rich and yet the O 2 sensor still detects free oxygen present in the exhaust. So I think I may have a bad relay. Holley Sniper EFI Oxygen Sensors 554. Improper install leads to the ECU reading lean, which adds more fuel, which makes the issue worse. Hook battery up and go to turn on ignition. Discussion Starter · #1 · Aug 17, 2013. The Holley sensor took a few minutes to start working again, because of all the soot, but it came back to life. Thoroughly inspect the WBO2 sensor circuit for misinstallation, possible cut or burnt wires. Featured Products Holley EFI NTK Wideband Oxygen Sensor $318. 6%, at just off idle, where it normally may be like 2% It was now barely running. - Replaced all plugs, Ohm tested all plug wires I have ordered a new O2 sensor since idling and acceleration are my two trouble areas. Holley Sniper EFI suddenly severely overfueling. How an Exhaust Leak Affects Wideband/O2 Sensor Readings. Holley EFI; Sniper EFI; If this is your first ension-Harness (WBO2 Sensor Test At End Of Wideband O2 Sensor Notes) May Gods grace bless you in the Lord Jesus Christ. Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Holley Sniper O2 sensor replacement Holley part number 554-155. Holley is sending me a new wideband sensor, no questions asked, and it shipped today. Holley Technical Support 1801 Russellville Road Bowling Green, KY 42101 Phone: 270-781-9741 www. Holley Sniper Issue solved and a tip that might help>Holley Sniper Issue solved and a tip that might help. It felt like it was going to stall out at stoplights. I removed WBO2 sensor from pipe and let dangle in fresh air. This allowed moisture and cold cranking fuel to contaminate (soak) heating element causing premature failure during cranking and idling. 8 to 12 AFR and it does fluctuate/move, I can rev the engine and hold RPM, and WBO2 reads 14 then goes back to 12. Holley Sniper EFI and Hyperspark. Solution was to install a 90* fitting into the O2 sensor bung, relieving the sensor of the moisture shots. 95 Part# 554-101 Add To Cart Holley EFI Oxygen Sensor. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. When a wide band sensor is fouled or damaged, they read lean. Had the Holley Sniper EFI installed 4 years ago & I keep having trouble with the 02 sensors failing. It felt like it was flooding out at low speed, low RPM. Give Your 2011-2023 Ford More Breathing Room With Holleys Hi-Ram And Ultra Lo-Ram Coyote Manifolds. 5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. - Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi - All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Another way to drive an O2 rich is to tap into its signal return wire to the ECU above the O2 connector, disconnect the O2 and then put one hand on the tap and your other hand on the positive battery post. Solution was to install a 90* fitting into the O2 sensor bung, relieving the sensor of the moisture shots. When you need to service your Sniper EFI throttle body, Holleys list of parts include these O2 sensors to maintain a proper. Holley Sniper EFI O2 Sensors Keep Failing! 3rd one in 1,000 miles. So Im just going to order the O2 sensor posted above. Intro Holley EFI - How To Check For Potential Problems Holley 136K subscribers Subscribe 55K views 5 years ago https://www. Had to source a manifold riser spacer from performance fuel injection ($80) to accommodate the O2 sensor, found a nice stainless return to tank fuel fill adapter from CP Performance ($50) to avoid removing or drilling into the fuel tank, and used an existing threaded plug for the Coolant Temp sensor. I had a few issues with the Holley Sniper System. Holley Sniper EFI Problems: Best Fixes According to Manufacturer>Holley Sniper EFI Problems: Best Fixes According to Manufacturer. Thoroughly inspect the WBO2 sensor circuit for misinstallation, possible cut or burnt wires. com/brands/holley_ Show more Show more. Clean or replace the Mass Air Flow sensor; Check for exhaust leaks. At this point I think its most likely a sensor failure or ECU failure. Holley Sniper EFI is FIXED!. OK like in the last video I posted I unplugged the o2 sensor and fired it up and it ran great. You definitely dont want to run it too long like that. Holley was able to fix my Sniper EFI unit after the o2 sensor circuit went bad and they also replaced the ECU. Another way to drive an O2 rich is to tap into its signal return wire to the ECU above the O2 connector, disconnect the O2 and then put one hand on the tap and your other hand on the positive battery post. Had the Holley Sniper EFI installed 4 years ago & I keep having trouble. Finally, inspect the fuel lines for leaks or blockages. I think thats unlikely, but itll only take you a few minutes to inspect the harness. Discussion Starter · #1 · Aug 17, 2013. Holley Sniper EFI O2 Sensors Keep Failing! 3rd one in 1,000. Oxygen Sensor and Coolant Sensor Install. This is my 1959 Ford F100 that Ive had since I was 16. i just got my engine running with the holley efi. They didnt see anything but suspected a bad ECU, so I sent in the whole thing in and they rebuilt it for free (kudos Holley). How To Properly Place and Install an O2 Sensor. If you used the strap on bung that came with it check the gasket. i just got my engine running with the holley efi. Ordered Complete Roadster Kit - 12-24-09. Bad Oxygen Sensor? Holley NTK. Finished installing the Sniper on my 1969 Fairlane a few weeks back. The owner is frustrated because the engine is running way. I drove it around the block and not one ounce of issues. Started truck and WBO2 sensor showed 23 AFR. Bad Oxygen Sensor? Holley NTK - YouTube This car runs on methanol, and at the track the last couple outtings the car was misbehaving and reading really rich. I replaced the sensor with a Bosch 17025 sensor and also installed an HBX-1 extender. 7 Mercruiser EFI Conversion. Nov 28, 2021 #26 rmchrgr Well-Known Member Local time 2:07 AM Joined Oct 11, 2016 Messages 502. Holley>Troubleshooting Guide. Holley Sniper Installation Supplement. Holley can not plan for every case such as you not have a ECT sensor hole in aftermarket heads. I can look down throttle bodies and see all injectors are working. So, what are the symptoms of a bad O2 sensor? Here are 10 common bad oxygen sensor symptoms: Continually failed emission tests Flashing or illuminated CEL ( Check Engine Light) Misfiring, rough idling, or stalling Bad fuel economy/ gas mileage Poor engine performance Engine noises Black exhaust fumes Sulfuric/rotten-egg smell from the exhaust. 95 Part# 554-101 Add To Cart Holley EFI Oxygen Sensor. He asked me to leave my bad o2 sensor and he. Anyone have a good place to find a genuine Bosch O2 replacement sensor without paying $110? Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! Register now for free!) Advertising Sponsored Links 09-27-2020, 10:39 PM Gaz64 CC Member Join Date: May 2008 Location: Brisbane, QLD. - Found and repaired an exhaust leak upstream of the O2 sensor at the manifold donut. Note the sensor is being heated and the condensation can thermally shock it. PDF Troubleshooting Guide. O2 sensor placement is critical for getting your engine to read the oxygen in the exhaust correctly and can directly impact the performance of your new EFI installation. Holley Sniper EFI oxygen sensors are the best replacements for your system. Been a year since installed the repair and thereby fixing my problem. To Properly Place and Install an O2 Sensor. Holley Sniper EFI O2 Sensors Keep Failing! 3rd one …. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. I ended up disconnecting the WBO2 sensor to get it to run and back home. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. This one came in with black clouds and 100% fuel Learn on the handheld barely running, with the WBO2 reading at 35:1 AFR. Likewise, if an engine runs excessively rich, an oxygen sensor thats positioned farther downstream is less prone to fouling. WBO2 Sensor 17025 Bosch 554. Sniper EFI Initial Startup and Troubleshooting. Troubleshooting Holley Sniper that hesitates on acceleration. Holley Sniper EFI oxygen sensors are the best replacements for your system. 00 Add To Cart Add to Wish List Share 4 Emissions This part is legal for sale or use on Racing Use Only Vehicles. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holleys software to a lap top (which I dont own), and program the starting fuel pressure to the temperature of the coolant. If disconnecting AIR pump, check with local ordinances for the legality of this procedure. I have a feeling there is an issue inside the unit. Oxygen Sensor, Replacement, Sniper EFI, Terminator X, 3-wire, Thread-in, Each See More Specifications / Check the Fit. These are globally used for all sensors that have Caution or Warning outputs configured. The right side o2 was obviously reporting a fat 10. If you suspect that your Holley Sniper EFI is having fuel delivery issues, there are a few things you can check. This will help prevent condensation in the exhaust tubing from entering the sensor. Also check your cranking voltage if it starts hard. My O2 sensor issues were determined to be the sensor tip being to deep into the exhaust pipe. The WBO2 sensor initially reads Heating and then immediately reads an A/F Ratio of 35. I removed WBO2 sensor from pipe and let dangle in fresh air. O2 SENSORS: These need to be properly installed per Holley instructions. This is the seventh unit Ive installed and know there have been some bad sensors right off the bat with these. Solution was to install a 90* fitting into the O2 sensor bung, relieving the sensor of the moisture shots. Holley Sniper EFI offers the following instructions for fixing backfires: Check for intake leaks and make sure all connections are tight. Oxygen sensors read unburnt oxygen, not fuel. Discussion Starter · Jul 2, 2013. I was just hoping for some feedback before sitting on the phone waiting for tech support. O2 sensor placement is critical for getting your engine to read the oxygen in the exhaust correctly and can directly impact the performance of your new EFI installation. Make sure your exhaust flanges and exhaust gaskets are good or your o2 sensor will show youre running lean when your not. 2a/f with engine running or not. The oxygen sensor is a critical component of any electronic. Although these extreme conditions arent a concern in most street applications. Sniper had been running fine for about 2500 miles. The BOSCH #17025 is what fits the Holley Sniper. We double checked all wiring, no exhaust leaks, etc. Had to source a manifold riser spacer from performance fuel injection ($80) to accommodate the O2 sensor, found a nice stainless return to tank fuel fill adapter from CP Performance ($50) to avoid removing or drilling into the fuel tank, and used an existing threaded plug for the Coolant Temp sensor. If you cannot identify the problem yourself. OXYGEN SENSOR INSTALLATION WARNING! Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an extremely rich mixture, which could cause drivability problems and severe engine damage. Featured Products Holley EFI. I reinstalled sensor turned Closed Loop & Learn off and restarted truck. Came out and started the car, and noticed the O2 sensor reading, AFR, was steady climbing, and actually topped out at 35. Holley Sniper EFI O2 Sensors Keep Failing! 3rd one in 1,000 miles. Check the timing and adjust if necessary. It is possible for the ECU to have an internal failure that can kill O2 sensors. Featured Products EFI - Fuel Injection $2. the motor is rich it burns my eyes. 9K subscribers Subscribe 25 Share 2. Bad Oxygen Sensor? Holley NTK - YouTube This car runs on methanol, and at the track the last couple outtings the car was misbehaving and reading really rich. Holley sniper stealth tps issue. When you need to service your Sniper EFI throttle body, Holleys list of parts include these O2 sensors to maintain a proper reading of oxygen levels in the exhaust. Another way to drive an O2 rich is to tap into its signal return wire to the ECU above the O2 connector, disconnect the O2 and then put one hand on the tap and your other hand on the positive battery post. Started truck and WBO2 sensor showed 23 AFR. Explained: Holley EFI Sensors and What They Do>Explained: Holley EFI Sensors and What They Do. Ensure the location for the sensor is at the angle in Figure 1. Tested my o2 sensors and determined the ECU on my Holley Sniper Efi is bad. Make sure the fuel pressure is correct. I have a feeling there is an issue inside the unit. Then Friday night as I was driving home, the car started acting up. On my fitech, itll show the voltage its getting. Not much changed it, restarting, idle, full throttle. Holley efi behavior with bad o2 sensor, safety feature. Being a large gasket, should it fail, the resulting gap is significant and has the potential to introduce a. plug it back it , says heating then 27. Dont know how much excess fuel going thru the exhaust ruins the sensor but its a good bet it might be bad now. Holley Sniper EFI O2 Sensors Keep Failing! 3rd one in 1,000 miles. Holley Sniper O2 sensor replacement Holley part number 554-155. Pay specific attention to the O2 sensor cable lead. Warning and Caution Indicator Indicates status of the “Caution” and “Warning” parameters. suspect bad o2 sensor with Holley efi. I went to auto zone and told the very young counterman my problem and that I was looking for a less expensive version of what Holley was selling. From startup the AFR is sky high and visibly pumping fuel and smoke out. Engine reacts just as before, surges, loads up, smokes and then quits. Everything checks out except no power to the pink sniper wires, no power at fuses for sniper turn ons. The Sniper EFI unit only requires four wiring connections: battery positive and negative; a key-on, 12-volt source; a crank signal; and an rpm signal. It will pick up all those bad learns. If youre installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Featured Products. Very Detailed showing of installing the O2 sensor in the back of the water neck, and also installing the 02 sensor in the exhaust system. Holley’s Sniper EFI system is tough to beat in most situations. My tune is coincidentally set at 11. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. - Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi - All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. We Test It: Holley’s New Sniper EFI. I had an o2 sensor fail on a pass yesterday, and flatline at 11. Not being across WBO2 sensors, is this an indication its damaged and is failing? Seems funny that it is fine for 40 minutes, where engine temps hit just on 185°F and never stumbled, then decides on a restart to play up. You must upload the last known to be good Global Folder, upload. Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. The oxygen sensor is an ingenious little device and one of the most critical sensors in any EFI system. I had an o2 sensor fail on a pass yesterday, and flatline at 11. If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. Oxygen Sensor? Holley NTK. Holley was able to fix my Sniper EFI unit after the o2 sensor circuit went bad and they also replaced the ECU. After about 15-30 restarts, the engine is now running excessively rich and yet the O 2 sensor still detects free oxygen present in the exhaust. They didnt see anything but suspected a bad ECU, so I sent in the whole thing in and they rebuilt it for free (kudos Holley). O2 SENSORS: These need to be properly installed per Holley instructions. Any exhaust leak ahead of the o2 sensor and the sniper thinks its lean & starts putting the gas to it. 2 a/f, i unplug the sensor it says unplugged. This gives the ECU a lean signal and the mixture should richen a lot when in closed loop. On EFI systems such as Holleys Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. Oxygen Sensor? Fails way too early. Warning and Caution Indicator Indicates status of the “Caution” and “Warning” parameters. Try unhooking the O2 sensor and see what it does. At this point I think its most likely a sensor failure or ECU failure. Started truck and WBO2 sensor showed 23 AFR. The Sniper EFI unit only requires four wiring connections: battery positive and negative; a key-on, 12-volt source; a crank signal; and an rpm signal. Efi will make small problems seem huge. They didnt see anything but suspected a bad ECU, so I sent in the whole thing in and they rebuilt it for free (kudos Holley). Picked up the 1st Mk 4 Roadster, 3-5-10, Still not finished. I ended up disconnecting the WBO2. car is a third gen 1990 Chevy Camaro with flowmaster mufflers. After the external inspection, pull the WBO2 sensor and visually inspect it, maybe it fell apart. 2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported. 74K subscribers Subscribe 14K views 3 years ago Attempted to make a parts run in my 1990 Third gen Chevy Camaro with a small block chevy. Ive never seen the shop I had install my Sniper hook up a lap top to the car. 3 afr as a result, but the car still went 139mph, LOL. Estimated Ship Date: Monday 5/8/2023 Holley Sniper EFI Oxygen Sensors. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. O2 sensor placement is critical for getting your engine to read the oxygen in the exhaust correctly and can directly impact the performance of your new EFI installation. First, make sure that the fuel pump is turned on and working properly. The harnesses are long enough to mount into. The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. Hook battery up and go to turn on ignition. If the O2 cable has melted it is not something fixed under warranty and will require the unit to be sent back to Holley to be repaired at customer cost. Things like a small vacuum leak or exhaust leak wi throw off readings. Make sure that it is tied out of the way from any heat sources or other hazards. The Sniper EFI throttle-body drops in place of your. Sniper had been running fine for about 2500 miles. - Found and repaired an exhaust leak upstream of the O2 sensor at the manifold donut. I reinstalled sensor turned Closed Loop & Learn off and restarted truck. This really applies to any O2 sensor regardless of EFI system. On EFI systems such as Holleys Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. When a wide band sensor is fouled or damaged, they read lean. Wideband Realities: The Truth About Oxygen. com/parts/spe-4730 Also the clamp for the O2 sensor will be too small if you have 3 header collectors. or at least disable learning while its running all goofy. These are globally used for all sensors that have Caution or Warning outputs configured. But if the system thinks your at 35AFR, then the injectors will be pushing 100% of duty cycle to try bring it down. I know from some of the other posts, there have been WBO2 sensor issues. bbf single turbo in the o2 is hung on 27. You can use a T-stat housing like this on that accepts an ECT https://www. My Bronco with Holley Sniper EFI was running poorly. Holley Sniper EFI Troubleshooting. 74K subscribers Subscribe 14K views 3 years ago Attempted to make a parts run in my 1990 Third gen. Long story short, I managed to delete the current file and replace it with the current FW: tslcd35st_sniper_fw_01_03_0500. Holley Video Team. 1/2 price o2 sensor for Holley Sniper. Holley Sniper - Oxygen Sensor Location Thread starter GA Architect; Start date Nov 22, 2019; Content may include affiliate links. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. 95 Part# 554-100 Add To Cart Holley EFI LSU4 Bosch Wideband $194. Holley was able to fix my Sniper EFI unit after the o2 sensor circuit went bad and they also replaced the ECU. Sniper EFI Installation Tips from Holleys Tom Kise>Top 10 Sniper EFI Installation Tips from Holleys Tom Kise. It is really A pretty good setup. Direct plug in and even has a longer harness. It is possible for the ECU to have an internal failure that can kill O2 sensors. Holley can not plan for every case such as you not have a ECT sensor hole in aftermarket heads. Try unhooking the O2 sensor and see what it does. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. Likewise, if an engine runs excessively rich, an oxygen sensor that’s positioned farther downstream is less prone to fouling. - Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi - All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Holley Sniper EFI offers the following instructions for fixing backfires: Check for intake leaks and make sure all connections are tight. Holley Sniper EFI o2 sensor location. Featured Products Holley EFI NTK Wideband Oxygen Sensor $318. Additionally, if an Sniper or Terminator X EFI System has repeated O2 sensor failures and none of the above-listed suggestions seem likely then contact Holley and arrange to have the unit tested. These replacement Bosch wideband sensors feature anti-seize pre-applied to sensor threads. New to the forum and new to Sniper EFI. - Replaced all plugs, Ohm tested all plug wires I have ordered a new O2 sensor since idling and acceleration are my two trouble. So apparently the 02 is definitely the issue. 95 2129 Products View Parts Sensors. O2 sensor failure on a Holley Sniper EFI Zanes Garage 4. This minimizes installation time and. This is my 1959 Ford F100 that I’ve had since I was 16. o2 is ntk, i did not plug it up until the last thing as the instructions. 1/2 price o2 sensor for Holley Sniper. It’s simple, competitively priced, and compatible with a long list of. After about 15-30 restarts, the engine is now running excessively rich and yet the O 2 sensor still detects free oxygen present in the exhaust. Efi will make small problems seem huge. My O2 sensor issues were determined to be the sensor tip being to deep into the exhaust pipe. First sensor I ordered myself, was wrongBosch 17014 does fit the Fitech harness, but does NOT fit the Holley Sniper. Holley Performance >Changed mufflers, now 35. Holley EFI Oxygen Sensor Replacement Sniper and Terminator X O2 Sensor Part # 554-155 2 Reviews In Stock Free Shipping - Lower 48 US States Your Price $132. This minimizes installation time and packages really well on a diverse group of engine applications. First sensor I ordered myself, was wrongBosch 17014 does fit the. Fuel pressure has been verified at the Sniper EFI throttle body and is between 55 & 65 psi All wiring has been tied away from potential hazards such as the exhaust, fans, pulleys, spark plug wires, 12 Volt accessory wires, the ignition coil and ignition coil wiring. Been a year since installed the repair and thereby fixing my problem. Pay specific attention to the O2 sensor cable lead. If the Learn Table is corrupted, you cant just replace the WBO2 sensor, and restart the engine. I spend and hour and a half with a meter checking every single wire and connection I made. Holley EFI Oxygen Sensor Replacement Sniper and Terminator X O2 Sensor Part # 554-155 2 Reviews In Stock Free Shipping - Lower 48 US States Your Price $132. Holley Sniper EFI Oxygen Sensors 554-155 HLY-554-155. About Press Copyright Contact us Creators Advertise Developers. 4K views 9 months ago This is my 1959 Ford F100 that I’ve had. Holley efi behavior with bad o2 sensor, safety feature>Holley efi behavior with bad o2 sensor, safety feature. Although these extreme conditions aren’t a concern in most street applications. It was installed in a short bung so that made sense. The Holley sensor took a few minutes to start working again, because of all the soot, but it came back to life. PDF Sensor Diagnostics and Statuses. Part: 90 degree brass extension spacer, angled Oxygen sensor extended adaptor M18x1. In many aftermarket applications, the O2 sensor is mounted behind a collector gasket. Holley is sending me a new wideband sensor, no questions asked, and it shipped today. Part: 90 degree brass extension spacer, angled Oxygen sensor extended adaptor M18x1. Holley Sniper that hesitates on acceleration>Troubleshooting Holley Sniper that hesitates on acceleration. If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. Since it was reading rich, the. 6 Also, the CL COMP % was at 100, as was the CURRENT LEARN, also at 100 I did also notice the INJECTOR P/W was way highlike 11. Sensor Verification Verify all. From reading on here it sounded like my WBO2 sensor was bad. Holley EFI Oxygen Sensor Replacement Sniper and Terminator X O2 Sensor Part # 554-155 2 Reviews In Stock Free Shipping - Lower 48 US States Your Price $132. Holley Sniper EFI. Not being across WBO2 sensors, is this an indication its damaged and is failing? Seems funny that it is fine for 40 minutes, where engine temps hit just on 185°F and never stumbled, then decides on a restart to play up. The basic kit comes with the TBI unit, touchscreen controller, water temperature sensor, a wideband oxygen sensor, and all the necessary wiring. Warning and Caution Indicator Indicates status of the Caution and Warning parameters. In a horizontal or if pointed upwards it can collect exhaust condensation liquids upon start up.