holley sniper o2 sensor problems
Why? While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. *Possible delays due to Covid-19 click for more information. In my experience the far majority of Sniper EFI customers never have a problem with radio frequency / electro-magnetic interference (RFI/EMI). The point is that not all gasoline has a stoich of 14.7:1. I"m going to gap down to 0.35 to 0.45. Yeah, it's easy to shave down because it's a thick copper washer. Crazy thing is they say, "Hey go to EFI to forget about Carb problems." If you do not understand a step seek assistance. This despite having a quality brand of plug and coil wires that were well-routed. Once that ratio is calculated, the meter displays that information as an air-fuel ratio (AFR). Start with the factory-recommended spark plug. This is the seventh unit I've installed and know there have been some bad sensors right off the bat with these. In your 7-pin harness, you will be either using the yellow or the purple wire for RPM input. #1 1/2 price o2 sensor for Holley Sniper. Heres why this is important. The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. Read this. If you think this will create a significant AFR error on a wideband O2sensor, you would be correct. One common issue is poor fuel delivery, which can cause a number of symptoms. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. If an O2sensor is used as a comparator on a given engine, then its accuracy isnt as critical. This install is on a 2000 Ram 1500 2 door short bed full size truck. Ignition coils can begin to break down internally, doing so gradually so that the engine will still run (particularly at idle.) All times are GMT-6. Find a lower price anywhere and we'll beat it by 5%! Reflected RFI situations like this one requires more in-depth investigation. Once potential causes have been ruled out, more targeted tests can be performed using a digital multimeter or a handheld tuner. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! If there is any corrosion on the ground or power wire terminals, clean them with a wire brush and apply a coating of dielectric grease. There is nothing that I am aware of in the material of the cap that restricts RFI/EMI in any way. Use a clean white cloth and wipe inside of the cap. On the other hand, low-powered signals (like the Wideband O2 sensor), signals that generate their own power (like the magnetic pickup in a distributor), and resistance-based sensors (like the Throttle Position Sensor) can be terribly corrupted by RF energy. Getting what I think is false lean readings. Even if it does show good continuity pull not only the alternator but the bracket as well. Take the alternator belt off and all is good. One is to get the vehicle somewhere it is as close to pitch dark as possible. More wires that are potentially unneeded. You'd know if you saved a Config File. It appears that I've lost my WBO2 sensor. This can be caused by a problem with the timing or fuel mixture. injection systems capable of Troubleshooting Holley Sniper that hesitates on acceleration Because O 2 sensors use free oxygen as their only measurement for calculating AFR, they can be subject to significant error when working at idle on engines equipped with long duration camshafts and/or cams with excessive overlap. Another way to put this is to not chase after a magic AFR number that you think the engine should achieve. Reply Save Like quick-silver Generally, that is bad advice. We then installed an EMS five-gas exhaust analyzer to evaluate the idle quality. Car runs perfect now!!!!! If it's clogged, replace it with a new one. Assuming your ohm meter zeros when you touch the leads together, if it is even one ohm that is more than it should be. This bung location needs to be verified before using it with the Oxygen sensor included in the Sniper EFI system. This is by far the best guide to EMI/RFI sources and troubleshooting Ive come across on the web. :-). I agree with Tony. I have been told that e-core coils tend to emit less RF energy than standard canister coils and I believe that to be true. I'm still on schedule to cruise my '71 Stingray from Ottawa, Canada to what should be a blast of a Corvette party at the NCM. Subscribe for updates! With a little detective work and some patience, you should be able to get your Sniper EFI system up and running like a dream. By following these steps, you should be able to fix fuel starvation in your Holley Sniper EFI system. Very good read! Even a small exhaust leak will pull fresh air in from the outside and greatly exacerbate this free oxygen problem. The excess oxygen fools the self-learning system into tuning for a rich AFR. After some research I replaced the o2 sensor. Let us know in the comments below. Even if it acts properly when powered off you might want to just get a new TPS and try it. Went to back the car out of the shop one day and it would not idle for anything. Any advice is greatly appreciated Under "System Parameters" is a section called "Engine Parameters" and a section called, "Ignition". Despite the cams mild overlap, the on-board wide-band sensor produced readings of between 16:1 and 17:1 AFR on our wideband O2sensor. The machine indicated very high HC (unburned hydrocarbons raw fuel). What works on one setup can cause problems on another. At the end of my roper here so any help is appreciated. 534-199. The msd I was using was I dont know how old. Thanks Chris for the feed back regarding my rough running sniper/timing issue even though I bought my sniper through Holley. They are a couple of bucks each, right? Because they are easier to purchase than the Magnecor my favor is leaning in their direction. The first thing to do is key the system on, wait about five seconds so that the TPS zero's, and then press the throttle to the floor and watch the TPS. There are a few things you can check to see if it's the ignition system. If these are sooted up then you might have found part of your problem. A high HC number could mean that the AFR is excessively rich. When you're installing the Sniper, and until you have it running well, stick with copper and swap to a new set at the first hint of fouling. This is a photo of the screen as the car was running 65 mph on the highway in overdrive. This page was generated at 03:38 PM. PDF -849 Shiny, 550-850 Black, & 550-851 Gold) -852 Shiny, 550-853 - Holley Holley puts a resistor in the sensor harness under the shrink wrap . offer easy plug-and-play The Holley Tech after receiving my datalog said I need to send my throttle body and handheld in for repair of the ECU. Merely add the exhaust closing to the intake opening number to determine overlap. This is the Sniper unit on a big-block Chevrolet. Holley efi behavior with bad o2 sensor, safety feature We wont get into all the details of how this calculation occurs but each manufacturer uses a different smoothing process to record this data and determine the AFR. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 242/248 at 0.050 with 110 degree LSA and 110 degree intake centerline The AFR stays at 35. Increased gaps increase spark resistance, causing energy to be emitted from the plug wires. Fairly new Sniper EFI install around 200 miles. Other EFI Systems may require different terminals. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. Instead, its a matter of understanding what is really happening inside the engine. The most typical culprits are the spark plug and coil wires. VPs Q16 racing gasoline is a highly oxygenated example of a fuel that is a long way from a stoichiometric AFR of 14.7. To those that had to send your unit in, how long was the turnaround? Yeah, it's best to do it right, and you won't have any more early WBO2 failures with the Innovate Motorsports. Note: Do not attenpt to shorten (or lengthen, for that matter) an O2 sensor's pigtail. If the problem persists, it may be necessary to replace some parts of the Holley Sniper EFI system. #1 35+ AFR, replaced WBO2 sensor, same problem. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Before launching into the source of RF energy, it may be helpful to recognize those components of the Sniper EFI System that are most susceptible to RF energy. First, check the fuel pressure. check out the. Rather, it is acting as a reflector, and grounding it doesn't seem to have much impact on that. 2. I better heed their warning, since I have had no less than five returns on defective Holley parts so far, and I don't want to jeopardize the warranty. One solution to this issue is to make sure there are no leaks in the system that could contribute to this problem. We will safeguard your e-mail and only send content you request. Ultimately, troubleshooting a Holley Sniper EFI problem requires patience and attention to detail. In fact, if you have concluded that you don't need ECU-controlled ignition timing but can't resolve your RFI problems through the other means discussed here then I'd say it is imperative that you consider switching to the HyperSpark distributor if one is available. 0:00 / 7:35 O2 sensor failure on a Holley Sniper EFI Zanes Garage 4.74K subscribers Subscribe 14K views 3 years ago Attempted to make a parts run in my 1990 Third gen Chevy Camaro with a small. Then it quits. But most of them can easily be shortened to a length that dramatically decreases their susceptibility to RFI. My only issue as present is some misfiring popping through the throttle body. This one is not marked Digital WBO2 Sensor Problem - Holley Performance Products Forums We will discuss tuning tips a bit later in this article. Good luck! If you're like many car enthusiasts, you may be considering a Holley Sniper EFI system for your next project. Been through seven 02 sensors and seven or eight sets of plugs. But the quality of their wire is unsurpassed. Holley was able to fix my Sniper EFI unit after the o2 sensor circuit went bad and they also replaced the ECU. I did the Holley distributor as well. #2 Wire It Properly Most important!!! Holley did a warranty on it and I have it back Have you had any trouble with your Sniper EFI? But you aren't the only one seeing that. You can just clear the Learn Table of the corrupted values, or upload the last "known to be good" Config File. I've read the WBO2 sensor notes: That's OK. To underscore this point, VP Racing Fuels Q16 sports a stoichiometric ratio of 13.3:1. This can be caused by a problem with the timing or fuel mixture. Ignition There are a few things you can check to see if it's the ignition system. He directed me to a few articles and I'm just about done with the set-up after getting what was most likely RF Interference issues sorted out. Last ditch effort, i sent the entire unit back to Holley for testing. As much as I hate to admit it I myself was in RF signal denial. May God's grace bless you in the Lord Jesus Christ. Stretch, What I Learned Today With Jeff Smith Homemade Strap Wrench, Build It Yourself Builds Worlds First 8,000 RPM 4-Valve Triton V10, Everything You Need To Know About The 2024 L5P Duramax Engine. . Get a new alternator. 25 Share 2.4K views 9 months ago This is my 1959 Ford F100 that I've had since I was 16. I tried Holley but didn't get much, so I thought I'd try Chris but knowing he owed me nothing.Well let me say he responded to my questions and concerns quickly, read some of my datalogs and provided some great advice. For a better experience, please enable JavaScript in your browser before proceeding. If you're going to try this, start by wrapping the harnesses wherever they are exposed. I was just told by Holley not to use the Bosch 17025 oxygen sensor as it may damage the ECU, since it's not calibrated for the Holley Sniper EFI. Overlap is defined as the amount of time (in crankshaft degrees) that both the intake and exhaust valves are open simultaneously. Admittedly, the HC difference was minor, but the point is that when we richened the idle AFR, idle vacuum also increased about 0.5 InHg. Ive been able to find some arching. Doubt it? Same. (Thank you Danny Cabral for pointing this out so well on the Holley user forums.). The ONLY definitive clue is that the RFI goes away when the alternator is unhooked, but replacing the alternator does NOT change the issue. Some tuners may then say that engine wants a 12.9:1 AFR. Problem is not the alternator. I keep a spare in my trunk, but I paid a lot more than $35. Just for fun, we calculated the overlap numbers for the largest Comp Mutha Thumpr cam which came to 88 degrees! Once arcing occurs, carbon traces form on the outside of the plug and that provides an even better conduit for ignition energy. Has anyone seen the WBO2 drivers fail in these Snipers yet? According to the manufacturer, the most common problems are fuel starvation, electrical interference, and backfires. It is best practice is to increase the Minimum Signal Value (which is currently defaulting to 0.0v) up to at least 0.35v and maybe as high as 0.65 volts. It never hurts to try but we've seen very limited success from grounding the air cleaner base plate. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Will this work in this order or is this even correct? My car was starving for fuel and breaking up bad. Installed a Lokar throttle linkage bracket custom made for the Sniper, removing the old one that had been on my Holley 750. I recommend setting this to 0.35v initially and then increasing to 0.5 and then 0.65 if that does not resolve your RF problems. The throttle body itself is generally fairly well grounded when bolted into place so, by extension, so are the air cleaner plates. This is where a preconceived notion that the engine should run at 13.8:1 would not necessarily be what was best for the engine. The owner commands a target idle AFR of 13.5:1. My tune is coincidentally set at 11.5 desired afr, with the failed side as the leanest bank, but the ecu added 15% fuel anyways. Today my truck started fine, ran great, and is now learning. This car runs on methanol, and at the track the last couple outtings the car was misbehaving and reading really rich. If your MSV is set to 0.0v it means that any amount of voltage that is able to induce itself onto the green/purple wire pair will be interpreted as a pulse. See the spikes on the brown fuel trace? If you suspect that there might be an issue with the timing, you can try installing a HyperSpark distributor or a coil driver module to improve timing control in the system. The oxygen sensor is a critical component of any electronic engine management system, and relays real-time air fuel mixture data to the computer for minute adjustments to fuel mixture. Newer alternators, (such as the Ford 3G, 4G/GM CS130, CS144), are able to produce near-full current at idle speeds plus they are so much more electrically quiet. Here is where the denial starts. But the primary goal has to be the prevention of RFI. However, it isnt a magic cure-all and you need to understand how the sensor works to truly get the most benefit out of one. In some cases, way too long. Personally, I have had the best experience with Magnecor wires. Explained: Holley EFI Sensors and What They Do The next step would be to try leaning the AFR slightly to improve the fuel mileage as long as the CO2 does not drop. You should then recheck the timing to make sure it is working properly. What's the AFR value? Lets confuse this situation further by adding that any oxygenated race gasoline will likely spec a different stoichiometric AFR. As their name implies, oxygen sensors measure the presence of oxygen in the exhaust. Super Sniper or Sniper XFlow? It does not work with the Sniper EFI oxygen sensor. Any other advice or ways i can further pin point the issue? 268/276 Degrees Advertised Duration (at 0.006-inch tappet lift) First, one must address why ignition charge is preferring to run down the side of the spark plug rather than arcing across the gap. These wires should be removed at the connector and replaced with a sealing cavity plug. So thats problem #1- #2 you have too fabricate a bracket too mount the pre and post fuel filters and the inline fuel pump behind the tank or spend about $800 on a new tank and intank pump unit. "Hey, you don't happen to have an electric fan coming on at about 185 degrees, do you?" Many, many years ago I discovered the "lightning storm" mentioned in the article. Even new wires occasionally have defects, and all it takes is one crack in the insulation for a wire to start arcing to the nearest grounded chunk of metal. Dec 23, 2016 Was off today, so decided to take my car out for a spin. If does the same funky behavior with the engine off then you definitely have a bad TPS. At that point, if I do anything that creates RFI then its an easy matter to back up.A final word on plugs not related to RFI. The O2 sensor is not a passive sensor that simply sends back data. Another symptom to watch out for is an excessively high idle speed. So, failing that, replacing the coil is a good way to test this theory. 218 / 224 at 0.050 with 113 degree LSA and 109 degree intake centerline Recently I received a data log from a customer who said that his car starting misbehaving when it got warm. Had the Holley Sniper EFI installed 4 years ago & I keep having trouble with the 02 sensors failing.. Your vehicle may already have an O2 sensor bung welded into the exhaust. A couple of options for getting one. Well my HBX-1 is sitting at 1 o'clock vs straight ahead, I wonder how critical it is to be straight at 12 o'clock? Thank you very much for this article. ive done dozens of these things and have one where air cleaner goes down bam she dies. While it was gone out I ordered the hyperspark ignition box from u and will be starting the set up and tuning shortly. Carbureted engines can suffer problems as well. Finally, if all else fails, you can try increasing the size of the fuel pump. So we then changed jetting to two jet sizes leaner than the original jetting. With excess free oxygen in the exhaust, the O2sensor reads this as a too-lean condition, so the ECU adds fuel. Engine displacement, idle speed, and manifold vacuum are also integrated into the equation used to produce an idle fuel number. If you're experiencing any of the symptoms we've outlined in this article, take a look at the manufacturer's recommendations for fixes. The engine may run rough or stall, and the vehicle may have difficulty starting. It is internally shielded and can easily be rendered an expensive failure. There are a couple of things that you can do that are relatively easy and might give you some solid leads on the problem. The engine has run about one or two minute since the AFR flashed red. The most important point is that O2sensors do not measure air-fuel ratio. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! MAIN POWER AND GROUND need to go to the battery. I was truly in denial. Most have an "LED Indicator" shown next to each as well. Instead, if you are experiencing RFI then do yourself a favor and do a complete ignition tune-up: Spark Plugs (the exact plug specified by the manufacturer for your engine), spark plug wires, cap, and rotor. At low levels RF interference will often reset the ECU so quickly that the engine will not stall. I like the idea of the washer shaving, thanks for that. In this case, a big cam in the engine was fooling the O2 sensor and the tuner thought the engine was too lean! That is not true of alternators. Then you'll get an outstanding product. By following these simple tips, you can help ensure that your system will continue to run smoothly for years to come. But if you have any problem (particularly with a rich running condition) you can know that you know that it's not spark plugs when you can just swap in a fresh set. I might be on my forth WBO2 sensor. - Holley Performance Products Forums Everyone else was backordered several months. Not a bad idea and definitely worth a try but so much of this is trial and error. Keep up the great work Chris, I'm sold! So I didn't join to complain, but this is ridiculous IMO. Minor but has only just started after 3 weeks . I have seen cases where the ECU gains an appetite for eating O2 sensors. All wideband O2sensors calculate an AFR based on a known standard, which is called the fuels stoichiometric air-fuel ratio. I'm glad you enjoyed the article. The new WBO2 is pegged at 35.6 before I even started the engine (reset tables first), and it stays there after I start the engine. I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. Fine tuned the timing to 12-15 degrees. There is very little free oxygen at 2,000 rpm and the calculated AFR reveals that it might be running slightly rich. - Replaced all plugs, Ohm tested all plug wires. That is understandable, because there may be absolutely no other indication. PDF Holley Sniper Installation Supplement - Summit Racing Equipment If your distributor is old then recognize that it could be rotating in a non-concentric manner. the two " tails " on the resistor were touching hence , not resisting.lol also had another bosch sensor die within one month . This fixed the high throttle position sensor reading (TPS) of above 1% that likely caused my idle issues. Tech Resources. Oct 12, 2022 ME4NSTRK69 said: Recent issue with my set up.