Regular maintenance is always important for prolonging the life of any mechanical system, and that includes your Holley Sniper EFI. For a better experience, please enable JavaScript in your browser before proceeding. Getting what I think is false lean readings. I'm glad you enjoyed the article. To prevent learning that could cause the trim tables to go excessively rich, we ran the engine for a few hours to establish a decent tune that ran well. 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. Emissions. https://www.holley.com/products/fuel/parts/554-155, If this is your first visit, be sure to Once an engine reaches a certain engine speed 2,500 rpm as an example the issue of overlap isnt as critical because theres less time for this to occur. http://forums.holley.com/showthread.ension-Harness, https://www.holley.com/support/resouFuel_Injection, If this is your first visit, be sure to Because they are easier to purchase than the Magnecor my favor is leaning in their direction. Here is where the denial starts. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! WBO2 Sensor Problem - Holley Performance Products Forums Installed a Sniper EFI kit onto a freshly rebuilt Pontiac 400 and was trouble free for the first 100 miles. #2 Wire It Properly Most important!!! We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. From reading on here it sounded like my WBO2 sensor was bad. In fact, the magnetic pickup is so susceptible that I recommend using a hall effect sensor (such as in the Holley HyperSpark Distributor) when practical. Even if it does show good continuity pull not only the alternator but the bracket as well. Cold starts good, hot starts good and runs good in open loop. With alternator unhooked there is no issue. Replaced and gapped to .45 all spark plugs. By following these steps, you should be able to fix fuel starvation in your Holley Sniper EFI system. Bolt-On EFI for your To calculate the overlap on your camshaft, find the exhaust opening and intake closing points preferably at the advertised numbers. Connect the msd to a separate battery. Check for intake leaks and make sure all connections are tight. You'll simply have to buy them direct if you're interested. Don't get crazy--if you set this too high then you will have troubles cranking the engine. If it's clogged, replace it with a new one. While it was gone out I ordered the hyperspark ignition box from u and will be starting the set up and tuning shortly. Thanks so much for the positive comments. The AFR trace on all my data logs since February have looked the same, new install. Reflected RFI situations like this one requires more in-depth investigation. An ungrounded plate tends to reflect it-- sometimes right down into the ECU. Bad Oxygen Sensor? Holley NTK - YouTube Start with the factory-recommended spark plug. ECU-controlled timing would conflict with these mechanical advances, so they are locked out (in the case of the MSD distributor) or are non-existent (in the case of the Holley Dual-Sync and HyperSpark Distributors.) And if you think about it, it makes sense. The Ordering process was so easy and non-painful. 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. But if you're fighting RFI then it's time to step up and do this. We will discuss tuning tips a bit later in this article. Assuming we added 2 jet sizes, the AFR changed to 12.4:1, and the power dropped 6 hp, we know weve increased fuel and the engine responded by losing power. If your mixture is too rich, it means there's too much fuel and not enough air. Full product line and accessories at excellent pricing. If your idle speed is constantly fluctuating or seems higher than usual, it's another sign that something's wrong with your Holley Sniper EFI system. That is not true of alternators. Move on. See Details. KIA Sportage Hidden Features - Making Your SUV Even Smarter. Holley Sniper O2 sensor replacement Holley part number 554-155. The best advice I could give is don't be in denial. There are a couple of things that you can do that are relatively easy and might give you some solid leads on the problem. Explained: Holley EFI Sensors and What They Do I just ordered that after talking to Jeff @ Holley. Holley efi behavior with bad o2 sensor, safety feature In the case of the magnetic pickup (more accurately referred to as a varible reluctor or VR), this susceptibility is compounded by the fact that many do not recognize that the sensor must be tuned to the environment. They sent me a new WBO2 and when that didn't fix my flashing red pegged AFR, they had me return the whole unit. You can take them back if you don't use them. We knew from experience that this engine would not idle at a true 16:1, so this was clearly an error produced by the overlap in the camshaft. I 'am just terrible with electronics. Fortunately, these problems can often be fixed with a simple adjustment to the air/fuel mixture. There is nothing that I am aware of in the material of the cap that restricts RFI/EMI in any way. Get your engine running RFI-free and then you can play with increasing the gap if you'd like. MAIN POWER AND GROUND need to go to the battery. Problem is not the alternator. *Possible delays due to Covid-19 click for more information. Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! It is internally shielded and can easily be rendered an expensive failure. All rights reserved. Thanks for commenting! Check the timing and adjust if necessary. While Sniper EFI problems can be frustrating, they are often easy to fix. 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. Another way to put this is to not chase after a magic AFR number that you think the engine should achieve. When you are inspecting/installing your cap and rotor, pay particular attention to the tab on top of the rotor and the button in the center of the cap. Would having a hole drilled in my Cap for phasing be bad for emi/rfi ? The ONLY definitive clue is that the RFI goes away when the alternator is unhooked, but replacing the alternator does NOT change the issue. The Holley Sniper EFI is a great fuel injection system for many automotive applications. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. We commanded a 13.2:1 AFR and the HC count dropped, revealing that the engine wanted the extra fuel to idle more efficiently. The coil is similarly mounted to put the coil wire in this zone. With excess free oxygen in the exhaust, the O2sensor reads this as a too-lean condition, so the ECU adds fuel. If you don't have "Magnetic" selected as you rignition type then none of this applies to you. Accuracy is a relative term, even here, because of how the O2sensors are designed. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Lifehacks That Kill Your Vehicle. - Found and repaired an exhaust leak upstream of the O2 sensor at the manifold donut. It was installed in a short bung so that made sense. See the spikes on the brown fuel trace? 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. Thanks. "Hey, you don't happen to have an electric fan coming on at about 185 degrees, do you?" If these are sooted up then you might have found part of your problem. In some cases, way too long. One zone where there is nothing but ignition wires and another zone for power and signal wires. 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 problem is that even the best wires don't last forever and all it takes is a crack in the insulation at a key point to create arcing. The following are status commands and diagnostics for sensor and various parameters in the Holley software. If you're experiencing any of the symptoms we've outlined in this article, take a look at the manufacturer's recommendations for fixes. (Thank you Danny Cabral for pointing this out so well on the Holley user forums.). This page was generated at 03:38 PM. All times are GMT-6. Same thing happen to me about two weeks worth of driving and 35.6 AFR. Same every time. The Fora platform includes forum software by XenForo. Tech Resources. The wiring from the Sniper and HyperSpark go up and away from the distributor.We hope to write a more detailed article on this soon. Holley Sniper EFI troubleshooting: Bad ECU?? - YouTube We used to sell thousands of dollars of these spark plug wires a year until I found them too difficult to deal with. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! 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. In one case I saw an installation where the large, oval air cleaner overlapped the distributor. 10-17-2017, 11:27 AM. Lets assume we have an engine that is equipped with self-learning throttle body EFI but is also equipped a long-duration camshaft that idles at 9 inches of manifold vacuum. O2 sensor should be somewhere in the 9 to 3 o'clock positions and never pointed up (3 to 9 o'clock positions) as I was told since it allows condensation to collect in it. So we then changed jetting to two jet sizes leaner than the original jetting. This problem with high overlap camshafts and O2sensors isnt limited to just EFI engines. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. Note also that there is a "Filtering" selection that can be toggled between "Low" and "High". Int. 3. RF Interference is an unavoidable enemy to successful EFI operation so it must be carefully and thoughtfully managed. Let us know in the comments below. Price Point: $, Advanced throttle body And you can plainly see the interference riding on the RPM signal. This should help prevent the problem from happening further. My O2 sensor issues were determined to be the sensor tip being to deep into the exhaust pipe. In the dark I see spark from the nut on the spark plugs running to the head bolts. There are a few things you can do to fix fuel starvation in your Holley Sniper EFI system.

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