Intermittent Check Engine Light After Engine Cools in Chevy 1500
I have a 95 Chevy 1500. If I start it cold and drive from
point A to point B, it runs fine and the engine light never
comes on. If I stop for maybe ten minutes, it's fine. If I
park it for long enough to get groceries, when I re-start (if
the engine is still a little warm) the check engine light will
come on and it will idle pretty rough. If I attempt to drive it
in this condition, it doesn't want to shift out of first. Now, if
I let it run for a few minutes, warm the engine back up, cut
it off and re-start it, everything is normal again. No light.
Seems like this problem is temperature based as it only
happens when the engine is somewhere between cold and
normal driving temp. It's also not something that happens
all the time. I've tried to replicate it for a mechanic but of
course, it wouldn't do it, and the mechanic didn't get
anything weird from diagnostics. Transmission was
replaced a year ago, has a new alternator and belts, no
fouled plugs and is up to date on preventative
maintenance. Doesn't leak any fluids or burn oil. Anyone
have a clue what this might be????