this is my previous post about on the prob with my brand new evo:
https://www.evolutionm.net/forums/sh...threadid=53981

I went to the dealer to check out my car and talked to the mechanic who was working on it. He asked me if anyone has worked on my car before prior to the problem I am experiencing. My reply was "my car is brand new and is as stock as it can ever be, of course no one has work on it before!" He said the reason why he asked was because he found coolant in my #1 spark plug hole which caused a bad connection between the spark plug wire and the plug itself and that was causing a misfire with the #1 cynlinder. After 1.5 week of many test drive, the dealer was finally able to tell me why my car wasn't running smoothly.

It puzzle me why there would be coolant there, anyone got any idea or theory? To those Evo owner who are experiencing the same prob as me, I strongly recommend you to check your plugs and see if there's any coolant in there.

 

Sorry if this has been asked, but did they fix it? Also they didnt tell you why there would be coolant in there?

 

they clean it out and the car ran fine. No one have a clue why there was coolant in there.

 

Hmm....That would worry me even if the car was running fine now.

 

Man, that sucks. Sorry to hear your problem. I got my car last May and got 6700 miles now and never had any problem. I'll have to check my spark plugs to see if theyre still good or need to replace. Hope your car is fine now.

 

how many miles was on your evo when you bought it?

 

I don't think I'd accept that explanation from the dealer. Coolant just doesn't mysteriously get in the combustion chamber. It's most likely a defect in the head or head gasket. If you are mechanically inclined enough, keep an eye on that plug and see if it continues to look okay. I would expect more trouble.

 

Make them replace the head gaskect.

Do not except anything less. When replacing the head gasket they might find why it might of leaked.

 

He dosen't mean that it was in the combustion chamber. It was in between the plug wire and the plug.

 

oh should read a little more carefully. My Bad

 

Still sounds fishy. Could be a small crack in the head allowing a little leakage from the water jacket into the spark plug well. Keep an eye on it and seek a new head if the problem recurs.

 

Its probably a good idea to check and gap your plugs (for everyone with a bit of mileage) since its good to check that the wires are making contact and whatnot.. PLUS, when I took out my plugs, they were fuel fouled and each one was gapped slightly different (and larger than recommended)

I had asked the dealer to replace the plugs after about 5000 miles, and he didn't want to, saying the plugs are good for 15000 miles or so before they have to be checked.. Though its probably true, I'd still check them periodically.. I know that its a bit of a pain because of the coil packs and the cover.. but its worthwhile for the 45 minutes of effort.

 

Oh, and FWIW, Coolant can easily get into the plug holes in the valve cover if the upper radiator hose or cap blows off and sprays coolant everywhere, which could happen to anyone if they did't adequately tighten a clamp (and/or theres a huge air bubble in the cooling system)

 

Pain Shoot its the easiest thing ever! Try a Subie And I think that this Tech is FOS! Coolant in the plug hole?? What is coolant doing anywere around there? If the water jacket theory is the case then all plug holes would not only have coolant but tons of oil! Even if it was just the spark hole gasket its elevated 3" fron the cam pan

 

True but not likely to go unnoticed/unsmelled