bad misfire under boost

[Silent_White]

ok... so last week my upper radiator hose blew up and soaked the engine. my car started misfiring under boost really bad at about 5lbs like i only have 3 cylindars working.. it progressively got to the point that i couldnt boost at all but ran find otherwise. After a few days i went to take the plugs out and realized that the plug wells were filled with coolant. I thought yay, easy fix...

so i changed the plugs at the same time. plug wires are about 5 months old (magnecore). link shows 7 degrees knock when it starts to misfire and the AFR is 10.5:1. it happens with and without methanol. boost leak tested solid at 35lbs. Happens on both GM maf and speed density. plugs gapped at .22 (gapped that small due to meth and boost to prevent spark blowout) worked like that for a long time too. no shaft play on turbo.

will check compression tonight. cant figure out why its misfiring under boost and running like absolute poop. any ideas are appreciated

 

[ThomasGSX]

It only misses when under boost??? I would do like you said and do a compression test, and if that holds up fine, then maybe the water seeped into the electrical and caused something to short out?

 

[Bluefire16]

Compression test, and if they dont seem great, do a leak down.

 

[dt23400]

According to your afr's your running way rich. I know that if i run my car rich it cuts and acts like a backfire. i could see you running afr's of 10.5 if you were running e85.

 

[Silent_White]

10.5:1 AFR is a little rich, but safer running 25lbs boost on 92 pump gas, and iv ran that AFR for a long ass time without problem. i dont think it's anything fuel related cause my afr's are good, and my fuel system is overkill for what i have anyway.
So i just drove off and i pulled from 30 to 50 without a problem, but my coolant temp went to like 210.. and then i tried it again and the problem was back. It's not fuel cut, its a misfire. fuel cut would show an injector load difference in DSMlink.
Im thinking that the coolant issue may be unrelated, and it might be my head gasket. would a compression test reveal head gasket failure?

 

[ThomasGSX]

compression test would definitely show if your heads are leaking, and if its bad enough, there maybe water in your oil.

 

[Silent_White]

so... never did the compression test. After about 3 days, it fixed itself completely. wierd, but im guessing that something was still wet and finally dried out. Been driving and boosting fine all day. however, i have been watching the temp and have a new issue, sigh.. stupid dsm.

my coolant temp rises to like 230 and the vent blows cold, then i rev the motor and the temp drops and starts blowing hot air again. Think this is just the thermostat?