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Old 12-09-2010, 05:29 PM   #6
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Join Date: Oct 2010
Location: Minnesnowta
Posts: 3,599
My Ride: 4cyl of fury
Originally Posted by Capt1014 View Post
Coolant temp sensor can make the idle surge?
I would think so, if the coolant is cold the engine will idle higher than if the coolant is hot. Turn your car on on a cold day and it will idle quite a bit higher than after you drive it for 20 minutes. Any variation in this signal could vary the idle speed of the engine.
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