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91 Caddy Misses & stalls when hot

Uncle's 91 Caddy RWD Brougham 5.7 V8 stalls, misses & lacks power when it gets hot. Usually after about a 40

  • mile ride.

Temp light doesn't come on. Sometimes you can restart the car after it stalls , other times it cranks for a real long time.

Any Hot Running Issues with this engine? Its a Chevy Caprice 5.7 V8 engine.

========= Harryface =========

1991 Pontiac Bonneville LE 3800 V6 ( C ), Black/Slate Grey _~_~_~282,525 miles_~_~_

~_~_~_~_U.S.A._~_~_~_~_~_

~~~The Former Fleet ~~~

89 Cavalier Z 24 convertible 78 Holiday 88 coupe 68 LeSabre convertible 73 Impala sedan
Reply to
Harry Face
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Sounds like! hahahaha

But seriously, HF, you have been reading this group long enough to know that you can just hook up a scan tool to it and see what sensors are saying what, when it starts to act up. Could be anything. GW

Reply to
Geoff Welsh

Is that the basic 5.7L Chebby with TBI injection or did Caddy get something special?

I would replace the cap, rotor, plugs, and spark plug wires. If they are original they are due for replacing.

You may want to take your multi meter and check the TPS voltage too. It should be around .54V idle and 3.5-4.0 volts at WOT.

Reply to
Dennis Smith

Don't rule out the dreaded crank sensor and PCM.

Reply to
hyundaitech

Here is a long shot possible solution.

30 miles is about how far I could drive my old truck before it would quit. As it turns out someone had installed a non-vented fuel cap on it. It should have had a vented cap. Because air could not go into the fuel tank to replace the fuel that was being consumed, the pump could not pull any more fuel out of the tank. It was an easy diagnosis because as I opened the fuel cap there was a tremendous whooshing of air into the tank. I just leave the cap on loosely now and don't have any problems.

If none of the other people's posts work, maybe try loosening the fuel cap next time it stalls and see if that is the issue.

Reply to
Jon Rodman

Try looking into the injectors.

Reply to
Black Bomb

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