Anyone have a clue what would cause this?
02-02-2005, 09:30 PM
#1
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Anyone have a clue what would cause this?
my brother has a 83 (i think) gmc s15 with 2.8L you start it when its warm and it revs to 4,000rpm and stays. This truck has a carb. the throttle is not sticking. 
Last edited by 1987 street toy; 02-02-2005 at 09:32 PM.
02-02-2005, 09:59 PM
#4
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Make sure to check the fast idle adjustment also. There might also be a vacuum mechanism that is involved in the carburetor throttle position, so you should probably check for anything controlling the carburetor. There might be one that has a vacuum switching valve that is stuck or something similar to that. I also agree with checking the idle and vacuum leaks.
Last edited by the_supernerd; 02-02-2005 at 10:02 PM.
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