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High idle at cold start: 2500 rpm

Spyder

Well-known member
Joined
Nov 3, 2004
Messages
1,136
Location
Des Moines, Iowa
Like the title says, I my car maintains 2500 RPM at cold start until it warms up.

Any suggestions? Vacuum lines on intake are plugged.
 

transparentdsm

Well-known member
Joined
Jul 27, 2011
Messages
3,690
Location
Cherry Hill, NJ
did it just start happening or did you just get the car together?

ISC, FIAV or BISS would be my guest.

edit: or throttle body shaft seals.
 
Last edited:

transparentdsm

Well-known member
Joined
Jul 27, 2011
Messages
3,690
Location
Cherry Hill, NJ
the block that is on the bottom of the throttle body. the part that allows coolant to run through it.

if its a new engine build, you need to warm it up and set the idle.
 

Spyder

Well-known member
Joined
Nov 3, 2004
Messages
1,136
Location
Des Moines, Iowa
Set the idle with the biss screw? I did that part. Not sure what else I can adjust.

I did replace the Throttle Position Sensor as well.
 
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