Mechanics

CHEVY CHECK ENGINE

1990 Chevrolet Truck

Engine Performance problem
1990 Chevy Truck V8 Two Wheel Drive Automatic 235000 miles

I have a 1990, 2500 series chevy truck with a 350. Check engine light came on. Next morning hard to start and runs rough when cold (Its been in the 30-40 in Chicago at night). Truck runs great after it's warm. No trouble starting the remainder of the day. We had a few warmer nights (50s) and it started much better but still not right,

Sound like a sensor to me but if you had to guess what would you try first. I hate to drop 85 bucks on a scan unless neccesary.

Thanks,

Dan
Avatar
DannyG
April 29, 2008.



I'd try the coolant temperature sensor this is the one that gives fuel enrichment during cold starts before the oxygen sensor takes over. Then the idle air control valve.

Rasmataz
Apr 29, 2008.