1991 Chevy Cavelier

JJBSMOM

MEMBER
1991 CHEVROLET CAVALIER

I have a 91 Chevy Cavelier that runs fine until you shut it off and it cools for about 20 minutes. The fuel pump and injectors have been replaced as well as fuel pressure regulator, MAP sensor, TPS sensor, crankshaft sensor, oxygen sensor, temp. Sending unit, ignition control module, fuel pump relay, also recently car has started stalling while driving at highway speeds. Any help would be greatly appreciated

Tuesday, November 20th, 2007 AT 5:59 PM

1 Reply

TOBYU

MEMBER
89 POSTS

Theres not much left to replace that could do it.
You need to see why it stalls and won't start when it does. Is is lack of fuel or spark.
I am guessing fuel. Get a pressure gauge hooked to it so you can see if it has pressure. Wait what engine do you have?
If a V-6 you should have a fuel rail fitting on a 91, if I remember correctly.
On a fuel rail of a multi-port you need at least 25 and that is below specs for it to run.
The new fuel pump could be weak or getting hot and not spinning fast enough.
The fuel pressure at the rail will tell you.

If you have a 4 cyl. It would be a throttle body spitter as I call it. You can look in the throttle body (carb like) thing to see if gas is spraying while cranking.

Try a spray bottle of gas into the plenum when it won't start to see if you can keep it running on the spray. Never try to run a car. Keep it running on ether. Too hard on pistons and rings and bearings.
You can run one all day with a spray bottle into the plenum if you can keep pumping the trigger.

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Wednesday, November 21st, 2007 AT 6:15 AM