1995 Firebird 3.4 LTR, Automatic. Stepson advised that the car had a coolant smell and was dying at stop signs. Found and replaced bad pump and Crankshaft position sensor. Now car barely starts (ether helps), hesitates BADLY when trying to accelerate, and when starting from a cold start, will idle fairly normal up to operating temp, then idle will jump to 1500-2500 RPM. No Service engine light is on.
If the coolant level is going down you may have an intake or head gasket leaking coolant into the cylinders pressure test the coolant system
SOURCE: Cold Start Idle Issue
Problem might be the air control valve, it's located at the right side rear of intake manifold and has a hose going to the air intake duct from the air cleaner, as a test you might try pinching off that hose when the idle is a problem.
CHECK THE IDLE SPEED SENSOR, UNPLUG IT AND SEE IF THE VEHICLE REVS UP A BIT. IF IT DOES, THEN REPLACE IT. ALSO CHECK THE FUEL PUMP RELAY IN THE FUSEBOX. HOPE THIS HELPS. .LET ME KNOW. GOOD LUCK
SOURCE: Car stumbles,hesitates,loses power on Hwy, randomly
Did you check earth connection of electric system?
SOURCE: engine light is on ,code P0171, hesitates when start driving
you will need a code reader to turn light off
SOURCE: Olds 2000 intrigue, when cold and even sometimes
hcmartini - did you mean you replaced the ignition switch behind the ignition key? How much would that cost?
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Service engine light came on, engine settled down to about 900RPM, and the car was driavable...for about 20 minutes. Suddenly the SEL went off, and the RPM just shot right up to about 2500. Once I shut it down, it will not start without many tries. No codes in computer. HELP!!!
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