1989 Chevy Corvette won't fire up after warmed up

MICGOLD

MEMBER
1989 CHEVROLET CORVETTE

Electrical problem
1989 Chevy Corvette V8 Two Wheel Drive Automatic

Engine Performance problem
1989 Chevy Corvette V8 Two Wheel Drive Automatic 26,000 orig miles

I tested a multitude of parts, no codes. Repeatedly and every time, it wound not fire up after it was warmed up and shut off.
Injector pulses are good and change appropriately when it warms and are still present when I try to re-start warm. Spark is always good, consistant and strong. Fule pressure is always good. Batt is new and strong.

What does anyone think about a stuck EGR, IAC( I know it does change opening when running), or loss of ign timing?

One time I installed a fuel pressure test gauge(when it was cold, before I first started it) did it restart (fire up)after I shut it off and I tried to restart it.

help
whats going on?

1 Reply

ERNEST CLARK

MECHANIC
1,730 POSTS

Are you saying that the engine will turn over but not fire, or it won't turn at all?

The EGR and IAC won't have anything to do with the engine firing. It'll just run rough when it does.

If you're getting spark and and a signal at the injectors while cranking, then your computer is good.

When you connected the fuel gauge, did you do it when the engine wouldn't start, or when the engine was starting fine?

If you also have good fuel pressure while the engine is cranking (at least 35 p.S.I.), Then the only thing else left is a mechanical issue. But with 26K miles, I don't see that happening.

Check the timing/ignition control module and coil. It's possible that the coil is getting heat soaked, or the ICM is faulty. But I also doubt that, since you said you were getting good spark.