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. Car runs perfect now!!!!! Fairly new Sniper EFI install around 200 miles. Several tries and "fixes" later i found that if the alternator in unhooked the problem immediately goes away. A grounded plate tends to absorb RFI into the ground plane. ive done dozens of these things and have one where air cleaner goes down bam she dies. Holley was able to fix my Sniper EFI unit after the o2 sensor circuit went bad and they also replaced the ECU. They told me I had RF problems that I failed to accept. $52.52. This is not a story on trashing oxygen (O2) sensors even though the title might appear to make that implication. It was installed in a short bung so that made sense. The problem occurs when an excessive amount of oxygen makes its way from the intake port directly into the exhaust at idle and low engine speeds because of overlap. But inside they are a cauldron of RF energy that is being broadcast all over the engine compartment. 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. If you're not sure what the problem is, it's best to take it to a mechanic or Holley dealer for diagnosis. I have a Sniper EFI unit here that we installed for a customer and it has come back for WBO2 sensor issues. I am so thankful to have found this article on RF signal denial. Holley Sniper EFI Problems: Best Fixes According to Manufacturer, 10 DIY Car Maintenance Tasks You Can Do at Home, Deodorant on Squeaky Belt. Sniper EFI Input/Output Harness. In the case of our Project Shop Truck with cast iron Vortec heads, GM recommends the ACDelco R44LTS6 gapped at 0.060 inches.On the point of gap I'm going to rebel a bit for the initial start-up. The throttle body itself is generally fairly well grounded when bolted into place so, by extension, so are the air cleaner plates. Find a lower price anywhere and we'll beat it by 5%! 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. Minor but has only just started after 3 weeks . With excess free oxygen in the exhaust, the O2sensor reads this as a too-lean condition, so the ECU adds fuel. If these are sooted up then you might have found part of your problem. 25 Share 2.4K views 9 months ago This is my 1959 Ford F100 that I've had since I was 16. These often end up bundled up in the engine compartment. Not a bad idea and definitely worth a try but so much of this is trial and error. This Crimping Tool is available with the Delphi 12048074 Metri Pack 150 Series Female Terminals that you'll need to reterminate after you shorten the wires. Backfires usually happen when the timing is off or the air/fuel mixture is too rich. This allowed moisture and cold cranking fuel to contaminate (soak) heating element causing premature failure during cranking and idling. Once potential causes have been ruled out, more targeted tests can be performed using a digital multimeter or a handheld tuner. Very good read! But when I went and washed the underside of the truck, they seem to have issues and fault out? With the advent of EFI systems like the Sniper EFI System more and more of the details formerly left to the installer are being completed at the factory to provide a "plug and play" experience. A 350ci small-block Chevy with this cam idled at 14 InHg of manifold vacuum at 850 rpm. If you don't have "Magnetic" selected as you rignition type then none of this applies to you. 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. This is one point that the EFI system will use to calculate the amount of fuel to deliver to the engine. Recently I received a data log from a customer who said that his car starting misbehaving when it got warm. After going round and round I found that the RPM readout on the handheld display goes crazy reading anywhere from 200-7000 RPM while the engine is just trying to idle. 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. Did they say what was the problem? In your 7-pin harness, you will be either using the yellow or the purple wire for RPM input. Racers will tell you Yeah, Q16 always reads rich. Now you know why. 100% of the time and without variation. Carbureted engines can suffer problems as well. VPs Q16 racing gasoline is a highly oxygenated example of a fuel that is a long way from a stoichiometric AFR of 14.7. Thanks. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. You should keep an eye on all the fluid levels and change the oil and filters at least once a year (or more often if you drive a lot). Were using a Comp Cams card that lists opening closing points at 0.006-inch. Atypical RF sources can be even stronger and have more deterministic effect on the ECU than the typical ones. Please dont interpret this to mean that you should not use an O2sensor to help tune. Why? The tuner could then use 13.0:1 as a point of reference. Compared to Cam A, thats an overlap increase of 42 degrees! But i did notice they are non restistor style ngk b6es. Super Sniper or Sniper XFlow? AFR was 32-34. Any advice on the plugs will be awesome. (77 46 = 31 degrees difference in overlap between Cam A and Cam B). What an odd situation! Cleaned all the plugs and it seemed fine. When you install them, it's a good idea to put a bit of dielectric grease on the inside of the boot on both ends of the plug wire as well. Price Point: $$$. Instead of fixing the problem, we leave the problem in place and go on the defense, trying to cover up wires, ECUs, and sensors that might be affected by RF energy. If that gets out of alignment you will have a fireworks show going on under the cap and never even know it. One of the first signs is the engine misfiring or running rough. Next, check the fuel filter to see if it needs to be replaced. If that doesn't work its probably time to replace that alternator. 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. KIA Sportage Hidden Features - Making Your SUV Even Smarter. This makes relying on the O2sensor problematic for engines with long duration and high overlap camshafts at idle. late-model V8 engine swaps. (Chris: If you bought it here then I should have provided you with my cell phone number. You betcha, and I did last night at a cruise in with a fellow Stingray owner who's got an EFI upgrade on his wishlist! The immediate result is shown in the trace below. Capability Range: Advanced I bought a new holley sniper , dual sync dist., coil, and holley in tank fuel pump, When engine got hot it would go crazy. Cheers. For example, on our shop truck our spark plug wires go immediately down and straight under the manifold to the spark plugs. Getting what I think is false lean readings. See the spikes on the brown fuel trace? You'd know if you saved a Config File. Also, make sure to inspect all the hoses and connections regularly for any signs of leaks or wear. This only occurred at idle. Another way to put this is to not chase after a magic AFR number that you think the engine should achieve. I look at the data log and noted that every time the engine got to 184 degrees it lit up with RFI. This is my daily driver. Start by removing and cleaning every single power and ground connection between the alternator and battery. Note also that there is a "Filtering" selection that can be toggled between "Low" and "High". Increased gaps increase spark resistance, causing energy to be emitted from the plug wires. #2 Wire It Properly Most important!!! An Iowa native, Smith served a variety of roles at Car Craft before moving to the senior editor role at Hot Rod and Chevy High Performance, and ultimately returning to Car Craft. Provided I don't find any RFI then I'll increase the gap and make sure I don't have any problems. 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. I'd like to echo Zachary P's comment above! Not Acceptable. There are a few things you can do to fix fuel starvation in your Holley Sniper EFI system. Instead, I'd check the grounding of the alternator itself. Add To Cart. Download the Config File from the Sniper and zip it along with the datalog you posted so we can see if there's anything in the configuration that might make the system more prone to EMI/RFI. If it looks like this, the engine is definitely too rich. But if you're not familiar with these systems, you may not know that they can have some quirks. AFR was 32-34. The first response I typically see to telling someone they have RFI/EMI issues is denial. Add To Cart. First, check the fuel pressure. 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 Car runs fine again. Let us know in the comments below. Same. This is the seventh unit I've installed and know there have been some bad sensors right off the bat with these. Price Point: $$, Robust, feature-rich Doubt it? I agree with Tony. Look for Valve Timing at .006 and then find the Intake Opening (25 BTDC) and Exhaust Closing (21 ATDC) numbers. 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. And finally, if your engine is stalling completely at random and nothing else really makes sense, then you might have RF interference issues. The machine indicated very high HC (unburned hydrocarbons raw fuel). But what we would suggest is that the engine is now very close to best peak power under the current atmospheric conditions. The "Gauge Text" is what would be shown on a 2-1/16 gauge or the Avenger handheld display. I hope they have them dialed in better for future users? Because O2sensors 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. Int. I mentioned to the customer that he could be getting EMI from his alternator and he thought, "I know a quick way to check that--disconnect the alternator!" So we then changed jetting to two jet sizes leaner than the original jetting. 07-19-2022, 02:09 PM Sniper had been running fine for about 2500 miles. Well, it's on it way back to Holley. 294/300 Advertised Duration Get your engine running RFI-free and then you can play with increasing the gap if you'd like. 242/248 at 0.050 with 110 degree LSA and 110 degree intake centerline 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. My only issue as present is some misfiring popping through the throttle body. injection systems capable of Open 41 BTDC Exh. Sponsored Links (REGISTERED USERS DO NOT SEE THIS POST/AD! If it were then grounding it would solve the problem. 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. Another common sign is when the engine feels like it is lacking power or running sluggishly. If you think this will create a significant AFR error on a wideband O2sensor, you would be correct. Hi Chris, I recently had a sniper system installed on my 55 nomad with gm zz4 350. 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. Many times I called Holley and ask why it wouldn't tune itself. The Wizard is what uploads the base calibration. - Found and repaired an exhaust leak upstream of the O2 sensor at the manifold donut. You're proof that it can be done. 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. But the failure tends to be deterministic, not random. But there have been such gains in technology on these CD boxes over the last few years that anyone with a box more than about 10 years old really needs to consider replacing it before it leaves them stranded. But if you're fighting RFI then it's time to step up and do this. Electrical interference can be caused by a number of factors, including loose grounds, bad wiring, or aftermarket ignition systems. Connect the msd to a separate battery. And your fastest resolve will be to call Holley they can walk you through a few procedures to try and isolate the issue. When the ECU sees EMI/RFI it loses . Overlap is defined as the amount of time (in crankshaft degrees) that both the intake and exhaust valves are open simultaneously. 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. If you suspect that your Holley Sniper EFI is having fuel delivery issues, there are a few things you can check. Well, first off, you are perceptive in noting that anything that increases resistance on the the plugs can lead to spark energy going where you do not intend for it to go. #1 1/2 price o2 sensor for Holley Sniper. Instead, its a matter of understanding what is really happening inside the engine. So, if you're experiencing problems with your Holley Sniper EFI system, it's probably best to take your vehicle to a certified mechanic for help. Assuming your ohm meter zeros when you touch the leads together, if it is even one ohm that is more than it should be. According to the manufacturer, the most common problems are fuel starvation, electrical interference, and backfires. #1 35+ AFR, replaced WBO2 sensor, same problem. Advertising Sponsored Links 09-27-2020, 10:39 PM Gaz64 CC Member Join Date: May 2008 Location: Brisbane, QLD Open 25 BTDC Exh. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Bad things will happen regardless of how good of a job you've done grounding and routing wires. This is one reason why comparisons of several O2sensors from different companies in the same exhaust system will display different results. Gap the plugs to the manufacturer-recommended gap and if you are running big compression or boost you will have to either increase your ignition power or CLOSE the gap to compensate. This may or may not be an ideal ratio for that engine and that number may or may not be 100 percent accurate. As you can see, this engine is idling at barely 9 inches of manifold vacuum (inner scale), so if we had an O2 sensor reading, it would probably indicate much leaner than the engines actual AFR. I've read so many threads about installing the new sensor, that I'm totally confused. 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. To do this will require downloading the Holley Sniper Software.
Best Router/firewall For Home Lab,
Pioneer 1600 Watt Amp 4-channel,
Articles H