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idle issue..not surge

663 Views 2 Replies 3 Participants Last post by  greenstreak
This may be a tuning issue. When i start the car it idles low...600rpm, but after it gets hot it will idle high...1600rpm

I don't have a logger to check my trims. I will be borrowing one hopefully in the next couple days.

To my knowledge cars run rich at start-up and idle gigh, then will lean out and idle properly. Mine is not..any ideas?
1 - 3 of 3 Posts
FIAV. It is what controls the idle speed at cold startup and then lowers it. It is actually a wax pellet that is warmed by the coolant lines that run through the throttle body.

-Diagnose the ISC
-Check for boost leaks

If it is neither of the above I would bet on the FIAV.
1 - 3 of 3 Posts
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