These are just my observations: Unless you bought the one-in-a-million plug that was bad, I attribute the first bad plug to detonation which will definitely give off misfire codes even though technically the engine didn't misfire. Assuming that to be the case, you're looking at bad fueling or bad fuel (which you considered). Since you're also getting misfires on both banks, the thought that all of those plugs/coils going bad at once is highly unlikely. That would return me back to detonation, and all the various bad things that happen there born out by the fact that at low load you didn't see any problems. For the cause, I'd look at the most likely culprit being the fuel or the aftermarket fuel system.
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Miracle My Engine Didn't Blow Up
- Thread starter DetroitST
- Start date
Thread Starter
#28
Well I feel I am talking to a wall but all is good now.
Scoped cylinders, all good.
Fixed wastegate vacuum nipple (bored the hole to 1/2" and screwed in a male 6AN to 5/16" SAE nipple, it was a very snug fit and didn't seem to leak but I did put JB weld high psi type around it in addition just to be safe).
Drained tank (sketchiest stuff I've ever done, lots of Home Depot specials making a tee off the low pressure side with a valve that I could open a little while the car was on to dump fuel. Took about 10 minutes to drop ~15 gallons).
Added new E85, runs like a champ.
Lesson... Don't get E85 far away from home, road trips I'll be switching to 93 from now on.
Scoped cylinders, all good.
Fixed wastegate vacuum nipple (bored the hole to 1/2" and screwed in a male 6AN to 5/16" SAE nipple, it was a very snug fit and didn't seem to leak but I did put JB weld high psi type around it in addition just to be safe).
Drained tank (sketchiest stuff I've ever done, lots of Home Depot specials making a tee off the low pressure side with a valve that I could open a little while the car was on to dump fuel. Took about 10 minutes to drop ~15 gallons).
Added new E85, runs like a champ.
Lesson... Don't get E85 far away from home, road trips I'll be switching to 93 from now on.
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