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09-10-2013, 10:35 AM
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#1 |
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Registered User
Join Date: Aug 2012
Location: Newington ct
Posts: 177
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High idle
I have a 78 c15 4.1. My question is when it's cold I start my truck the rpms are like 2000 then after warm its goes down to 750. Is that normal for the high idle to be that much at start ?
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09-10-2013, 12:38 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,733
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Re: High idle
It sure will if you got the high idle set too high. Here's a vid to show both the normal and the high idle screws. Turn your high idle down. You only need about 1200 rpm when it's warming up.
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