1994 Pontiac Sunbird slow idle

1994 PONTIAC SUNBIRD
134,000 MILES • 4 CYL • FWD • AUTOMATIC
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TOSSETH
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  • 1 POST
when the engine is idling, the car shakes just enough to make dash and muffler vibrate (very annoying). The idle is too low.
There is a screw on the throttle linkage that resembles an idle adjustment screw. Is that what this is for?
I took the idle control valve off and turned the ignition on and off and the pointed plunger moves in and out.
While its idling, if I barely touch the accelerator pedal..the idle will increase to a good speed and runs perfectly smooth.
please help.
Dec 2, 2009 at 2:59 AM
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JACOBANDNICKOLAS
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Try tightening that screw slightly to see if it helps the idle. Also, make sure there are no vacuum leaks. You also mentioned the exhaust making noise. Is there a chance the catylatic converter is loose inside and maybe causing some blockage?

Let me know.

Joe
Mar 8, 2010 at 1:17 PM