1992 Chevrolet Corsica Rough Idling and Speedometer Issues

Tiny
ASTRANK
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  • 1992 CHEVROLET CORSICA
  • 3.1L
  • V6
  • FWD
  • AUTOMATIC
  • 262,355 MILES
My car has a really rough idle (like it is going to stall) when I am stopped at a light or stop sign, has not yet died. We have changed the Idle Control Valve already and took it into a mechanic shop and they couldn't figure out what it was.
Also I have noticed that when I am driving down the street all of a sudden my speedometer will stop working and then a little while later it will start working again.
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Tuesday, March 4th, 2014 AT 8:00 PM

9 Replies

Tiny
KNOWLEDGE IS POWER
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When the car is cool open the radiator cap and look for thick brown stuff in the radiator. Its oil going into the coolant system through the upper intake gasket which causes running problems. Also if you've not done it a tune up is a good place to start
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Wednesday, March 5th, 2014 AT 6:43 PM
Tiny
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And the gauges are probably going bad as well and are available at local parts stores
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Wednesday, March 5th, 2014 AT 6:44 PM
Tiny
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What kind of gauge would I need to buy?
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Saturday, March 8th, 2014 AT 1:21 PM
Tiny
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There is no oil in the coolant, it just had a tune up apparently before I bought it, but we have noticed that it does this when the car is cold, (or first time driving that day) if the car is warm or has been driven and stop through out the day it seems to run fine.
I have also noticed a exhaust type smell when I start the car or it is idling rough at a stop light, I know that it needs the muffler replaced, but wasn't to sure if that smell was a sign as to why it is running and idling rough.
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Saturday, March 8th, 2014 AT 1:24 PM
Tiny
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This is good. But on the other hand it makes it hard for me to say for sure whats going on with the car now. It could be anything from a failing catalytic converter to an ECM or coolant temp sensor problem. Drive it this way a little while longer as there doesn't appear to be any danger of mechanical damage. It should most definitely set a code so we can go further
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Saturday, March 8th, 2014 AT 3:51 PM
Tiny
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I managed to get a code the other day off of my code reader and it was code 44.
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Saturday, March 8th, 2014 AT 4:05 PM
Tiny
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Ok. Now we are getting somewhere. That's a code for lean exhaust. This is most often caused by a vacuum leak. Crank the engine up and spray carb cleaner spray around the top of the motor and listen for the rpms to rise slightly. Thatll show you your vacuum leak if you have one. Its usually a hose or plastic fitting that's unplugged or broken. The other thing thatll cause a lean exhaust is lack of fuel, and it could be due to the coolant temp sender making the ECM lean out the fuel when the car is cold and it should be richer.
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Sunday, March 9th, 2014 AT 6:01 AM
Tiny
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My husband said that he went through everything checking for vacuum leaks and never found any, so we will try replacing the Engine Coolant Temperature Sensor and see if that makes a difference, I will post later about it.
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Sunday, March 9th, 2014 AT 9:22 AM
Tiny
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Ok good. As for the gauge, youd be replacing the whole cluster if it was determined that it was bad
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Monday, March 10th, 2014 AT 4:14 AM

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