MSD 6AL. It must be actively driven and controlled by the ECU. And you can plainly see the interference riding on the RPM signal. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. The best advice I could give is don't be in denial. Thanks Danny. Same. The Holley Tech after receiving my datalog said I need to send my throttle body and handheld in for repair of the ECU. What solutions worked best for you? If you're having trouble with your Holley Sniper EFI system, you might be wondering if it's worth taking your vehicle to a professional mechanic for help. But, if your symptoms persist then you need to consider that you may have an atypical RF source. There are a few things you can check to see if it's the ignition system. Another symptom to watch out for is an excessively high idle speed. The AFR trace on all my data logs since February have looked the same, new install. So, failing that, replacing the coil is a good way to test this theory. But here we see that the alternator was somehow indirectly responsible--that the true culprit seems to have been the old MSD box. 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. Holley EFI 554-155 Holley EFI Oxygen Sensor Strictly speaking, it's an RFI issue. I strongly recommend EFI System Pro. Invariably, this is the user that, after weeks of frustration, replaces the wires on out of sheer frustration and finds that it solves the problem. I am experiencing a faulty TPS which may be due to RFI. The next step would be to try leaning the AFR slightly to improve the fuel mileage as long as the CO2 does not drop. One of the first signs is the engine misfiring or running rough. Recently I received a data log from a customer who said that his car starting misbehaving when it got warm. Oxygen Sensor Problem - Holley Performance Products Forums All rights reserved. Advertising Sponsored Links 09-27-2020, 10:39 PM Gaz64 CC Member Join Date: May 2008 Location: Brisbane, QLD We then installed an EMS five-gas exhaust analyzer to evaluate the idle quality. AFR trace has 2 point lean spikes. Featured Products Holley EFI NTK Wideband Oxygen Sensor $318.95 $355.00 Part# 554-100 Add To Cart Holley EFI LSU4 Bosch Wideband $194.95 Part# 554-101 Add To Cart Holley EFI Your vehicle may already have an O2 sensor bung welded into the exhaust. In this first picture you see a quick blip of the throttle (light green trace) and the resulting increase in RPM. Whever someone has an RFI problem they always start by explaining the effort they have made to separate their wires from each other. Doubt it? Another action I have heard of people taking is replacing the 1/4-20 air cleaner stud with one made of a non-conductive plastic like nylon or delrin. Personally, I have had the best experience with Magnecor wires. The most common cause of electrical interference with Holley Sniper EFI is a loose or damaged ground/power wire. Very good read! Sniper EFI Input/Output Harness. Overview. We offer a spare wire removal kit for just this purpose. Corky I def did but it was the same part # Ill post how long it lasts for sure fingers crossed. These sensors (which includes the coolant temperature and MAP sensors) receive a 5-volt source and ground. Then it quits. Thanks. However, like any fuel delivery system, it can develop problems over time. What works on one setup can cause problems on another. Ahh, that explains the dot I saw on the HEX portion, LOL. That arcing will result in EMI. Assuming your ohm meter zeros when you touch the leads together, if it is even one ohm that is more than it should be. 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. Overlap is defined as the amount of time (in crankshaft degrees) that both the intake and exhaust valves are open simultaneously. One is to get the vehicle somewhere it is as close to pitch dark as possible. I know they'll find the problem. Yes, doing this means that you will need to cut wire from a fully terminated harness. Were using a Comp Cams card that lists opening closing points at 0.006-inch. That's why I am not a big fan of increasing spark gap.But the in-coil arcing you are experiencing doesn't sound right to me either. Lifehacks That Kill Your Vehicle. 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. What is important is that were using it as a reference point from which we can evaluate a change. As much as I hate to admit it I myself was in RF signal denial. However, in the event that RFI has reared it's ugly head in your installation, these tips should put you on the right track. For example, if the engine is running rough or misfiring, it could be a sign that the timing is off. 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. Replaced and gapped to .45 all spark plugs. (Thank you Danny Cabral for pointing this out so well on the Holley user forums.). The tuner could then use 13.0:1 as a point of reference. I don't know much about tuning but I'm getting frustrated, nobody has and ideas. However, if you have done everything else then this is absolutely worth a try. This product works with Holley EFI wideband oxygen sensors, part numbers 554-100 and 554-101. They aren't that expensive and there is absolutely no down side to keeping a spare TPS in the glove box if that's not the problem. Free ground shipping regardless of order size! I believe things are beginning to clear up. It just doesn't happen to conentrate enough RFI to create the instant ECU-stopping effects you see until the air cleaner is in place. Fairly new Sniper EFI install around 200 miles. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. Next, check the fuel filter to see if it needs to be replaced. If you don't have "Magnetic" selected as you rignition type then none of this applies to you. Heres why this is important. This can cause the engine to hesitate or stall. What's the AFR value? Check for intake leaks and make sure all connections are tight. Even if it acts properly when powered off you might want to just get a new TPS and try it. Capability Range: Advanced Instead, we thought wed share some insight into how O2sensors work and how they might conspire unintentionally to fool you. There are a few key symptoms to watch out for that can indicate an issue with the timing. #1 READ Read the instructions and Follow them. The engine has run about one or two minute since the AFR flashed red. I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. By following these simple steps, you should be able to fix most electrical interference problems with Holley Sniper EFI. It is simply amazing how much EMI an alternator can produce. I had my system installed by a local performance shop so I don't know where they picked up my master kit. This despite having a quality brand of plug and coil wires that were well-routed. Since they're having me send back the old WBO2 sensor before they ship a replacement $99.95, vs the $71.00 for the 17025, it's worth the peace of mind I guess. Try a completely different style of alternator. Holley Sniper EFI troubleshooting: Bad ECU?? - YouTube Even if it does show good continuity pull not only the alternator but the bracket as well. Open 41 BTDC Exh. Some wires simply won't work in an EFI-controlled vehicle. Sand to bare, clean metal every mating surface between the alternator and the engine block. Super Sniper or Sniper XFlow? 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. Not because it can't be--rather, because most installers recognize that running a spark plug wire and a signal wire side-by-side and/or in close proximity is begging for problems. But i did notice they are non restistor style ngk b6es. The owner commands a target idle AFR of 13.5:1. Even though the engine is equipped with a conservative 219 degrees of duration at 0.050 in its hydraulic roller cam, the tight converter created a sufficient load to pull the idle speed down when in gear to around 750 rpm. Normally, powered sensors are not bothered by RF impulses. I have a similar problem with the sniper and hyperspark on a 68 Chrysler 300. Great tips and advise. 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. If you think your throttle position sensor is failing, working some of the time and other times it is registering negative percent, my first suspicion: RF Interference. I have seen cases where the ECU gains an appetite for eating O2 sensors. Getting what I think is false lean readings. Yeah, it's best to do it right, and you won't have any more early WBO2 failures with the Innovate Motorsports. Engine builders and tuners all agree that when evaluating a tuning routine its always recommended to adjust air-fuel ratio and timing for what the engine wants, not necessarily toward a specific number. I sincerely doubt that. Thats a 1.4:1 or a 10-percent shift from 14.7:1. Holley puts a resistor in the sensor harness under the shrink wrap . The O2 sensor is not a passive sensor that simply sends back data. The old school way of tuning carburetors with a tach and a vacuum gauge may be crude, but will also get you close especially on engines with big cams. This is the seventh unit I've installed and know there have been some bad sensors right off the bat with these. Holley Sniper O2 sensor replacement - Club Cobra 1/2 price o2 sensor for Holley Sniper. - International Full Size Jeep The AFR stays at 35. It never hurts to try but we've seen very limited success from grounding the air cleaner base plate. Terminator X Max 700R4 LS2 L92 heads and LS3 525hp cam and Jim Inglese 8 stack fuel injection. Had the Holley Sniper EFI installed 4 years ago & I keep having trouble with the 02 sensors failing.. This is also why stock GM LS camshafts use an LSA between 116 and 122 degrees to smooth the idle and help the O2 sensor. Any advice on the plugs will be awesome. I swapped from a Edelbrock 750 and a Carter mechanical pump. Solving RF Interference Issues in Sniper Installations - EFISystemPro.com I have had others with similar "alternator-related" problems that never got it solved, even after changing the alternator multiple times and cleaning every connection. If any wires are frayed or broken, replace them with new ones. While Sniper EFI problems can be frustrating, they are often easy to fix. It appears that I've lost my WBO2 sensor. I like the idea of the washer shaving, thanks for that. I'd like to echo Zachary P's comment above! WBO2 Sensor Problem - Holley Performance Products Forums As overlap increases, that little triangle becomes larger, which will allow more free oxygen into the exhaust and fool the O2 sensor at idle. 01-28-2019, 10:29 AM I know you keep saying location. That being the case, RFI/EMI will pass through the cap itself whether it has a hole in it or not. But most of them can easily be shortened to a length that dramatically decreases their susceptibility to RFI. And when you do it can seem like nothing is working right. But the primary goal has to be the prevention of RFI. Was told the Sniper and the ECU tested good and that the problem was with the install. Other EFI Systems may require different terminals. One common issue is poor fuel delivery, which can cause a number of symptoms. Capability Range: Moderate Then we turned the Snipers learning function off to prevent the system from over-compensating for free oxygen in the exhaust from camshaft overlap. Not happy at all. 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. Where you do pass these high-voltage wires ensure that the wires are running at 90 degree crossing angles--never run in parallel. Holley Sniper EFI Problems: Best Fixes According to Manufacturer, 10 DIY Car Maintenance Tasks You Can Do at Home, Deodorant on Squeaky Belt. If you swap the TPS and have the same problem then you probably do have an RFI problem. Minor but has only just started after 3 weeks . If it sounds better, the vacuum gauge reads a higher and more stable number, and the idle speed increases, all of these are indications the engine liked the change. Jeff Smith, a 35-year veteran of automotive journalism, comes to Power Automedia after serving as the senior technical editor at Car Craft magazine. Instead, its a matter of understanding what is really happening inside the engine. WBO2 Sensor 17025 Bosch 554-155 Holley - EFISystemPro.com This is a photo of the screen as the car was running 65 mph on the highway in overdrive. So. I also couldn't add insurance or find out what Holley had it covered for (but Holley told me they wouldn't cover damage, so it is in the original box with foam and another box for extra protection). Start with the factory-recommended spark plug. I have a Sniper EFI unit here that we installed for a customer and it has come back for WBO2 sensor issues. Once arcing occurs, carbon traces form on the outside of the plug and that provides an even better conduit for ignition energy. If you're experiencing any of the symptoms we've outlined in this article, take a look at the manufacturer's recommendations for fixes. A plug wire that runs too near the Sniper or plug wires that run near any of the sensor wires are often the root cause. Recent issue with my set up. Fairly new Sniper EFI install around 200 miles. However, with a little time and effort, most problems can be successfully diagnosed and resolved. You'd know if you saved a Config File. This is my daily driver. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! In the installation manual you will find a "General Wiring Reference" with two paragraphs of "Do's" and "Donts". Here is my advice and I follow it strictly in my own installations. This may not sound like a big deal, but it changes the fuels stoichiometric number from 14.7:1 to 14.1:1. I used the tip of checking for arcing in the dark and bingo I can see white light between the epoxy-sealed body and metal casing on my MSD HVC Blaster coil. Installed a Lokar throttle linkage bracket custom made for the Sniper, removing the old one that had been on my Holley 750. Holley Sniper install | Team Camaro Tech Troubleshooting Holley Sniper that hesitates on acceleration What an odd situation! Any advice? If you do not understand a step seek assistance. Here is what I have done so far: - Sent data log to Holley. Bad things will happen regardless of how good of a job you've done grounding and routing wires. Emissions. Super helpful and knowledgeable. These often end up bundled up in the engine compartment. IMHO. Well, it's on it way back to Holley. Last ditch effort. https://www.holley.com/products/fuel/parts/554-155, If this is your first visit, be sure to Finally, if all else fails, you can try increasing the size of the fuel pump. Thank you very much for this article. Tested my o2 sensors and determined the ECU on my Holley Sniper Efi is bad. 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. Surprisingly, I've almost never found that to be the problem. All wideband O2sensors calculate an AFR based on a known standard, which is called the fuels stoichiometric air-fuel ratio. So as not be deceived, its necessary to learn how O2sensors operate. 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. I should note that I am running a 6.0 truck motor with the high driver side alternator, which happens to be very close to the TPS and IAC on the throttle body. If you cannot identify the problem yourself, consult a qualified mechanic for help. Holley efi behavior with bad o2 sensor, safety feature We will discuss tuning tips a bit later in this article. #1 35+ AFR, replaced WBO2 sensor, same problem. Nice job! injection systems capable of Then when the engine is shut off, most of the self-learning systems add this fuel to the long-term fuel trim number richening the overall fuel delivered at idle. They key is to be persistent and solve the problem, preferably by identifying and removing the source of RFI. Just want to take a moment to thank Chris for all of the assistance during the timing control set-up of my Sniper installation. Cleaned all the plugs and it seemed fine. Add To Cart. As an example, we have some experience with a carbureted 4.8L LS engine in a street Chevelle. But if you're not familiar with these systems, you may not know that they can have some quirks. The msd I was using was I dont know how old. This is by far the best guide to EMI/RFI sources and troubleshooting Ive come across on the web. Great things are achieved through persistence. Provided I don't find any RFI then I'll increase the gap and make sure I don't have any problems. 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. Have tuner now still runs very rich, have to run open loop to get home, runs pretty good. The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. The problem is that the base plate is not conducting the RFI. If you have done the steps above then you likely will never have any problem with RF interference. Im running msd street fire wire set. using a ntk now and no issues . I've read so many threads about installing the new sensor, that I'm totally confused. Ignition coils can begin to break down internally, doing so gradually so that the engine will still run (particularly at idle.) The Holley Sniper EFI is a great fuel injection system for many automotive applications. This is one point that the EFI system will use to calculate the amount of fuel to deliver to the engine. Bosch part number 17025 it's the same as the holley part and I found it on ebay for 35$ shipped the holley and local parts stores wanted 140$ I bought 2, Have you wondered why you only paid $35 on Ebay for a Bosch O2 sensor? For example, if the engine is running lean, it could be due to a dirty air filter or a restricted fuel line. This is where I will get all of my EFI equipment from now on.The MSV and filtering settings make a HUGE difference. In your 7-pin harness, you will be either using the yellow or the purple wire for RPM input. Will it happen again? When we say, "They just don't make them like they used to", we generally mean something is not as good as it used to be. This can be caused by a problem with the spark plugs, wires, or coil. They told me I had RF problems that I failed to accept. (Yes, connect the power and ground directly to the battery!). Part# 558-491. Don't get crazy--if you set this too high then you will have troubles cranking the engine. Capability Range: Advanced So I didn't join to complain, but this is ridiculous IMO. If it looks like this, the engine is definitely too rich. Keep up the great work Chris, I'm sold! Same thing happen to me about two weeks worth of driving and 35.6 AFR. 10 EVs with Best Range in 2023 - Suitable for Interstate? Note: Do not attenpt to shorten (or lengthen, for that matter) an O2 sensor's pigtail. For a better experience, please enable JavaScript in your browser before proceeding. On a new-build I swapped over to the EFI sniper and dual sync distributor on a 383 big block Mopar with 810 Mi break in. There are a few things you can do to fix fuel starvation in your Holley Sniper EFI system. I"m going to gap down to 0.35 to 0.45. 2023 Power Automedia. I have the progressive link kit installed that I bought originally from you. I've used this method for diagnosing misfires ever since! Hope this helped someone in the future Oct 12, 2022 ME4NSTRK69 said: Recent issue with my set up. Ideally the bung will be 6-10 inches after the collector for a true reading of all cylinders and have a minimum of 18" length past the sensor location. There are a couple of things that you can do that are relatively easy and might give you some solid leads on the problem. That is not true of alternators. And finally, if your engine is stalling completely at random and nothing else really makes sense, then you might have RF interference issues. Thats the best way I know . This fixed the high throttle position sensor reading (TPS) of above 1% that likely caused my idle issues. But it could also indicate a misfire because the engine was running lean. My sniper was returned to Holley for warranty due to the fan#1 circuit was grounded all the time. If you're going to try this, start by wrapping the harnesses wherever they are exposed. I don't know anything specific to suggest other than what you read above. The pin removal tool mentioned in the section above can be used to remove these pins from the 7-pin connector on the Sniper main harness. Not Acceptable. This may or may not be an ideal ratio for that engine and that number may or may not be 100 percent accurate. If you're not sure what the problem is, it's best to take it to a mechanic or Holley dealer for diagnosis. Problem gone. For this example, well look at overlap on two Comp small-block Chevy hydraulic roller cams. You'll simply have to buy them direct if you're interested. I hope they have them dialed in better for future users? VP rates this fuel with a stoichiometric ratio of 13.3:1 and suggests increasing carburetor jetting by 4- to 6-percent to compensate for the added aromatics. But if you're fighting RFI then it's time to step up and do this. If you're like many car enthusiasts, you may be considering a Holley Sniper EFI system for your next project. My only issue as present is some misfiring popping through the throttle body. The first thing to realize is that RF interference can manifest itself in ways that will have you suspecting and replacing everything in the system. As their name implies, oxygen sensors measure the presence of oxygen in the exhaust. Another common sign is when the engine feels like it is lacking power or running sluggishly. This free oxygen is picked up by the O2sensor and determined to be indicative of a lean AFR condition when, in reality, the engine could potentially be running slightly rich. The excess oxygen fools the self-learning system into tuning for a rich AFR. Not only will they have the necessary tools and expertise to troubleshoot the problem, but they'll also be able to identify any other potential issues with your vehicle that could be causing the problem. Clean or replace the Mass Air Flow sensor. 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. Replacement Bosch Wideband Oxygen sensor for Sniper EFI and Terminator X systems. This is also why self-learning throttle body EFI systems tend to struggle when used on engines with lower than 10 inches of manifold vacuum. So we then changed jetting to two jet sizes leaner than the original jetting. There is very little free oxygen at 2,000 rpm and the calculated AFR reveals that it might be running slightly rich.
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