Mechanics

CHOKE OR IDLE SPEED SURGING FROM FAST TO NORMAL WHEN FIRST STARTED AND WHEN AC AND HEAT IS TURNED ON.

1991 Toyota Pickup • 140,561 miles

When engine is first started something is making the idle speed surge to fast back to normal. After a few minutes the idle speed is normal.I also notice this when the AC and heat is turned on. The vehicle is a 1991 Toyota truck 4cyl, 4x4 5 speed manual transmission with 140561 milage. Thanks
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Airflight
September 23, 2011.



I would first be checking that the IAC is not faulty, clean the throttle body, check any A/C idle up valve and get a scan done for any unresolved fault codes, start here.

Mhpautos
Sep 24, 2011.