Hi aehssani,
Thank you for the donation.
Additional air going into the intake manifold would increase the idling speed. There are 2 possibilities for this happening.
1. Idle Solenoid Control valve is receiving a signal to open allowing more air to go in.
2. Throttle is being operated by the Throttle Opener Vacumn Switching Valve. Item # 14 in diagram.
I would suspect this to be the problem. Check if the VSV is being activated when lights are turned on with engine running.
Throttle Opener VSV is activated by the ECM so this could be bad news.
If the water pump gasket is leaking, replacing it would do but if the water pump is leaking, no other option but to replace it.
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Saturday, April 11th, 2009 AT 9:24 AM