Originally Posted by 52Carl
In regards to your fast idle issue, when you adjust the idle mixture screw, does it change the idle speed at all?
If not, you may have a significant vacuum leak somewhere.
If you ever want to demonstrate an extreme vacuum leak, pull the the vacuum wiper hose of of the intake. The engine will go up to around 1200 RPM.

52Carl - yes, it changes when I adjust the idle mixture screw. When doing my latest "tune-up" , I adjusted the mixture screw to obtain the best vacuum on my vacuum gauge. The vacuum was in the green zone at roughly 18/19 in-hg. You think that's good?

Ron - - Dusty53
1954 Chevy 3604
In the Gallery Forum
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