Mechanics

CORISA IDLE

1993 Chevrolet Corsica

I have a 1993 corsica w/3.1L sometimes the car will not idle, you can give it a little bit of gas and it runs fine but as soon as you lift off the gas it dies. Sometimes you can turn it off and let it set for a minute and restart and idles fine. It just does it every now and then. I have replaced the idle sol. And cleaned the air intake sensor and egr but thats it. Any info would be a big help. Also the car only has 123000 miles. Thank you for your help
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Robert15m
August 23, 2007.




First thing I would do is check for vacuum leaks around the engine compartment.

Next I would scan for codes if the check lite is on or if you have a code scaner handy.

Also note that these cars have coil packs which if are bad can cause problems these problems. When has the car had a major tune up last.

If nothing else pans out you want to have the fuel presure checked for proper specs.

This is just a start but hopefully helps.

Let me no how it gose.

_______________________
I try to answer questions as though it were my car.
My way of standing in your shoes looking to diagnos the problem.

Tiny
Poet042005
Aug 26, 2007.
Thanks for the info. Here is what I have done within the last 3,000 miles. I have replaced plugs, wires, air filter, temp. Sendors, thermostat, air idle solenoid, pcv valve and plenum gaskets. I have cleaned the egr and checked for vacuum leaks. The check light does not come on. Can the coil packs only mess with it when it idles, because if you crack the throttle just 100 or 200 rpms then it is ok and runs smooth. I thought about checking fuel pressure but it is hard to check because it does not do it all the time and by the time you get hooked up it might run fine. Maybe some day it will do it all the time and I can diagnose it better. In the meantime I will play around with it and see if I can find something. I will keep you posted if I find what it is. Thanks for helping!

Tiny
Robert15m
Aug 27, 2007.
Just to add the fuel pressure could be off required specs, the pump maybe working harder then it should. Your problem sounds fuel related.

Yes the packs affects the idle when it runs.

Has the packs been replaced within the past 2 to three years. Also have you changed the fuel fiter.

It sounds like you have had a good tune up but a complete tune up includes these as well.

I would start with having the fuel pressure tested.

Tiny
Poet042005
Aug 30, 2007.
I had this same problem on a Beretta. It sounds like you need to do a " Idle Relearn Prosedure". Hers what to do.

1. Unhook a Battery cable (doesn't matter which one)
2. Let it set a few minutes.
3. Hook it back up
4. Make sure the engine is cold
5. Start the car and let it idle until the fan turns on and tuns back off.
6. Shut the car off.
7. Unhook the Battery again for a few minutes.
8. Hook it back up and start the car.

The whole test should take about 20 min tops. If this doesn't change anything, try changing the coil packs and module. There about $20 a coil and $100 for the module. Happy Corsica.

Tiny
Speedysmitty
Sep 19, 2007.
Everythig you said was correct until you got to #7. If you disconnect the battery again you start the process over. Stop at #6.~Walt~
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Tiny
Walt McGregor
Dec 31, 2007.

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