Mechanics

IDLE AIR CONTROL VALVE

1999 Mercury Cougar

Electrical problem
1999 Mercury Cougar 6 cyl Two Wheel Drive Manual 135000 miles

Hi I have a Mercury Cougar V6 and recently the check engine light went on and idle was going high when I press the gas pedal. The rpms go up and down and then come to normal every time I press the gas pedal. I got the car scan and it said the idle air control valve was malfuctioning so I switch it for a bran new one and I still have the same problem but when I disconnect the valve from the cable its connected to the car runs great the rpms stay normal but the check engine light its still on what can I do should I leave the cable plug in or unplug it?
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Jony
May 26, 2010.



Check and test the mass airflow sensor and the throttle position sensor.

Rasmataz
May 27, 2010.