My parents bought a 1994 Trooper used a few weeks ago. S model, 86k miles. Supposedly had a new head gasket put on right before they got it - it was smoking a bit after it warmed up on the test drive, but hasn't come back since - figuring it was burning off something after the change (hadn't been driven between the change and test drive). I'm only mentioning that in case it plays in somewhere here. They drove it over to our house this evening, and dad says the check engine light is coming on. Not when idling, apparently it goes off then - but comes on when either accelerating or at highway speed - can't remember exactly now. This has been the first day of really warm weather they have driven it - possibly related?
A quick search over on groups.google.com says possibly O2 sensor or EGR valve? Thoughts, suggestions?
Thanks in advance!
Wesley