Question about 1991 Chevrolet Corsica
Rough idle, especially when at operating temp. Idle is OK cold. Seems to run just fine when driving down the road, but at stop signs, has very bad shake. Putting it in neutral helps a little. I have changed spark plugs and wires and cleaned throttle body best I can. New fuel filter and air filter. I know that number two spark plug hole has been stripped and resealed with HeliCoil (?) by previous owner. Low compression in that cylinder. Also has slight coolant leak out of head gasket, front of engine, driver side. No other leaks, oil is clean, in fact, it does not burn oil at all!
I take it by previous comment that the egr valve solution given to you was wrong and i`m betting you checked the vacuum line that went to it. My guess is the catilitic converter is burned out causing loss of compression try just turning idle screw up a little or spend money on new converter That piston compresion on that one kind of worries me i hope it han`t gone to bad yet
Posted on Sep 03, 2009
Testimonial: "Thanks for your help. I tested the EGR and it seems to be working, also the vacuum lines. New cat conv is probably worth more than the car!. "
It is a bad EGR valve.
Posted on May 01, 2009
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Posted on Jan 02, 2017
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