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Old 02-23-2012, 07:44 AM   #1
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Unhappy Misfire

I have had a misfire for quite some time now. I recently purchased the SCT tuner from AM and did a datalog and noticed that it was saying that all 6 cylinders were misfiring. This misfire is COMPLETELY random, no pattern between cylinders nor a pattern in the misfire itself and it had got to the point where it would cause the car to lurch. I was searching for what could be the problem and figured it was the Coil pack (the primary side should be 0.3 and 1.0 ohms and it was 1.3-2.3) so i replaced it and that cleaned up the misfire. thinking it was gone i ran another datalog and according to that the misfire is still there. (from idle to rev limiter it will misfire but can only be felt at idle) so i was wondering a few things. (i'm using the 93 race tune now) has anyone had to re-gap their spark plugs for this tune? Has anyone had to buy a new MAF with the tune or with a K&N CAI? and if not any ideas?
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Old 02-23-2012, 07:51 AM   #2
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Might be oxygen sensor or fuel filter
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Old 02-23-2012, 07:56 AM   #3
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Re: Misfire

heres what i've done so far:

replaced Spark plugs (gaped to .054)
replaced plug wires
replaced fuel filter
replaced Coil pack
did a seafoam treatment
oil change
cleaned my air filter


but i dont know about the oxygen sensor.
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Old 02-23-2012, 08:09 AM   #4
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Welll how many miles do you have
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Old 02-23-2012, 08:48 AM   #5
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Re: Misfire

87,000
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Old 02-23-2012, 09:29 AM   #6
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Try seafoam
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Old 02-23-2012, 09:44 AM   #7
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Re: Misfire

Quote:
Originally Posted by kickerofdoom View Post
Try seafoam
He already did that.

Idk what else you can check, honestly.
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Old 02-23-2012, 09:47 AM   #8
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Exhaust header leak.
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Old 02-23-2012, 09:51 AM   #9
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Re: Misfire

Have you perhaps tried checking all your vaccum lines and your intake? There may be a lose connection somewhere that may not be the main culprit, by contributing.
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Old 02-23-2012, 11:40 AM   #10
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Re: Misfire

i had thought it was the exhaust header too and i have one to replace the old ones with but i dont think that would cause it to misfire like it is...my understanding is it would be more consistent. i've checked my vacuum hoses and from just a visual i can tell that any are leaking and i just re-installed the intake because i also thought maybe it wasn't seated properly. i origionally had thought it was just one cylinder and that it was the injector for it, but i replaced that injector and it didnt change at all (then i recieved the tuner and did a data log)

when i first got the car and it was still under warranty i had taken it to the dealership i got it from and they told me they thought it was the MAF sensor....so i was going to buy some MAF cleaner but idk
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Old 02-24-2012, 01:20 PM   #11
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Re: Misfire

what im trying to get it is, does anyone know if you would have to change the gap for our car with a tune. all i have atm is a K&N CAI and true dual exhaust. so as far as i know i shouldn't have to.
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Old 02-24-2012, 01:24 PM   #12
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Quote:
Originally Posted by Ghostedmind
what im trying to get it is, does anyone know if you would have to change the gap for our car with a tune. all i have atm is a K&N CAI and true dual exhaust. so as far as i know i shouldn't have to.
No. You would not need to alter the spark plug gap.
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Old 02-24-2012, 10:22 PM   #13
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You should clean ur egr valve bro. A buddy of mine had the same problem and it was driving us crazy. We cleaned his egr valve and it sorted out the problem just fine. Ita fairly simple too, dont let a shop rip you off for such a simple fix!! Gl let me know if you try it and it works!
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