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Discussion Starter · #1 ·
My son's 97 2.0 AT is driving me nuts....Here are the symptoms, and what we have done so far with no results.

1.Car will intermittently miss and throw a p0304 code. #4 misfire.
2. Car starts normally (cold) but after a run and shut down it will, on occasion idle rough accompanied by steam around the front of the engine.
3. Yes, there is a small amount of coolant loss.

I feared that it may be head gasket, and it still may be, however, the there is no water in the oil, no steam comming out of the tailpipe, and all cylinders compression check at 180 psi. It seems to me that if there was a leaking head gasket, it would give me one of the three things listed above. I know there can be a leak between the waterjacket and the outside of the engine, but that should create steam every time it is restarted after being warmed up to temp.

What is driving me nuts is that it is intermittent.

We pulled the exaust header shroud and of course, it wouldn't duplicate the problem when we had a good view.

I'm now thinking that it may be the radiator inlet hose. That hose is in close proximity to the exhaust header. A slight pin hole in that hose could cause that but???

THe hose doesn't eaplain the #4 misfire code.

Any help would be greatly appreciated. I have rebuilt engines on both a 94 escort and a 93 Aerostar, so I've been pretty deep intio engines before, but this one is driving me nuts!
 

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Discussion Starter · #4 ·
I have the coilpack on my list of suspects, but that doesn't explain the coolant loss or the steam. ( I could have two different problems) Already checked for the plug condition, clean due to steam, and #4 is actually the
not as clean as the rest. if it was a bad fuel filter, it would miss, or lose power on a load all the time. 9At least that has been my experience.
 
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