Mechanics

CAR STALLS WHEN IT WARMS UP

1991 Chevrolet Corsica • 16,000 miles

Car - 91 Chevy Corsica 3.1 (160,000 miles)

Problem - Car struggles (no power), bucks and eventually stalls on inclines. If I wait about an hour, it will starts up OK and runs until it warms up.

Then it starts all over again - No power when I hit the accelerator while climbing up a hill or navigate steep country roads.

My speed drops down to 35-45 an hour, and stalls if I try to go any faster.


Garage work done:

The Check Engine Light was on - Replaced 2 of the fuel injectors, the Cat (old one was clogged) and EGR value.

I was told the other 4 injectors were tested and were OK.

It ran great for about a week before same problem came back. Note: The check engine light did go away, but someone told me it was probably reset. Not sure.

I had another mechanic run extensive diagnostics (with the car on) with a expensive meter. He was able to duplicate the stalling. The only error code from the scan pointed to a bad ignition module.

It was replaced, along with all the coils.

The problem did not go away.


Other things replaced or tried:

Map sensor
Crank sensor
Coolant temp sensor
New spark plugs and wires
Fuel injector cleaner additives

Fuel pressure was checked - it's good


I'm a big fan of your web site; so I'm hoping you might be the one to figure this out.

I'm a senor, living on a very fixed income and I need the car to get to my job.

Without the car I can't make enough to fix the car properly or get another.

Do you have any thoughts on what the problem is and what I can try?

I've exhausted all my funds trying to fix the problem.

I've gone through 5 different "street mechanics" and no one seems to have a clue.

Please help me

Thank you,

Rob
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Rmonet2012
August 14, 2012.



Since problem is engine temperature related, I would suggest checking the ECT.

KHLow2008
Aug 14, 2012.
Not sure if you mean the Coolant Temp sensor; if so, it has been changed.

Tiny
Rmonet2012
Aug 14, 2012.
Sorry I missed that out.
Presently are there any trouble codes?
You did not mention anything about the Throttle Position Sensor. Was it tested?

KHLow2008
Aug 14, 2012.
The only code that came up indicated a bad Ignition module, which was changed (along with the coils). As for the throttle position sensor, I don't believe it was. Where is it located on the Corsica?

Tiny
Rmonet2012
Aug 14, 2012.
It is on the throttle body.

KHLow2008
Aug 14, 2012.
Do you have any idea what I can try that I have not tried or changed?

Tiny
Rmonet2012
Aug 14, 2012.
First thing you need to do is to check what is missing when it stalled and could not start.

http://www.2carpros.com/articles/car-cranks-but-wont-start

The above link explains what to look for. Let me know what you find. Changing components without understand and checking if it is faulty is not the way to go about.

There are many possibilities and if it is elecrically related, that would make even more complicated.
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KHLow2008
Aug 15, 2012.
Thanks for the article and good advice. I agree, I don't have the
money to keep replacing components to see which fixes the problem.

I'm not sure how the article applies to my car. The car has no
problem cranking and starting up, even when it dies on me on the road.

After it gets warm, the car begins to stall when I try to accelerate
(usually on county roads). After it cools down, I've been able to
limp back home (slowly).

The real issues are: 1) Why does the car stall AFTER it warms up and in gear (Drive).

2) Why does it stall ONLY after I gas is applied to climb inclines.

Tiny
Rmonet2012
Aug 15, 2012.
Stalling at operating temperature and easily cranks up can mean the idling speed is too low. When idling speed is too low, the IAC could be dirty resulting in inefficient air flow. Cleaning the IAC and throttle body should solve the idling issue as there are no trouble codes.

KHLow2008
Aug 16, 2012.
Questions

What kind of cleaner should I use? Can I use something like WD-40?
I've seen several how-to videos on cleaning the IAC and throttle body.

Some have the engine running, others don't.

Which is correct?

Tiny
Rmonet2012
Aug 16, 2012.
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