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11-12-2020, 02:51 AM | #1 |
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Apparent rich misfire - help
Hi all,
Appreciate any guidance in advance I've recently developed a highly rich condition with stft sitting at -29.9 at idle with12afr (commanded at 15), I'm beginning to suspect that a ignition coil has failed but not sure how to diagnose this with certainty For context, it's a ecutek tuned turbo 86, been running great for 4 years, no hardware or software changes to note of late. I am alittle Sus about potential disabling of DTC code so can't check for misfire dtc to confirm, or atleast nothing is popping up when I scan for it Confident I do not have exhaust or intake leaks which tend to produce positive fuel trims anyways. I was thinking it may be oイ sensor? But it appears to be reading a corresponding voltage to the measured afr, seems like the less likely culprit What do you guys think? |
11-12-2020, 04:50 AM | #2 |
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could be leaking injector
excessive fuel pressure dirty maf sensor but just guessing maybe log some idle with ecutek cable and post up to www.datazap.me |
The Following User Says Thank You to steve99 For This Useful Post: | 504 (11-13-2020) |
11-12-2020, 11:38 AM | #3 |
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Stupid question probably, but what does your air filter look like?
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11-13-2020, 03:53 AM | #4 |
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11-13-2020, 09:55 AM | #5 | |
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Quote:
When was the last time you checked and/or cleaned it? |
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The Following User Says Thank You to FR-S2GT86 For This Useful Post: | 504 (11-13-2020) |
11-13-2020, 08:47 PM | #6 | |
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Quote:
Just an update, I have since pulled out 3 of 4 ignition coils and did an ohm test on the pins and they seem to come out good so far. I'll try get the 4th out, and maybe even spark plug if possible. From my last drive the issues occured on very light load application, i.e. full DI so don't think it's a port injector issue also . Anyone have an idea on which sensor would cause such issues if faulty? Maybe map? Oイ? UPDATE: MAF looks alittle oily, thanks Steve, map getting cleaned too. I'll report back if this changes anything Last edited by 504; 11-13-2020 at 09:15 PM. |
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11-13-2020, 10:19 PM | #7 | |
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After you clean your MAF sensor, and if that temporarily fixes the rich condition, after a hundred miles or so of some spirited driving, you should pull the sensor back out and check to see if it痴 oily again. If it is, then you need to figure out where the oil is coming from. The oily and dirty sensor will fool the ECU into thinking that there is more air flowing into your engine than there actually is, which it will then attempt to compensate for with more fuel....up to a point, at which it should then start throwing a code or two. |
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11-16-2020, 01:53 AM | #8 |
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Update to close thread.
Problem solved, appears to be dirty maf and/or map sensor. Car running fantastic now particularly at very light loads |
11-16-2020, 08:06 PM | #9 |
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Good to hear, but keep in mind what I said in my last post. If your MAF sensor gets oily again, there’s a reason.
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The Following User Says Thank You to FR-S2GT86 For This Useful Post: | 504 (11-17-2020) |
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