Slightly high idle

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Sep 13, 2012 | 09:26 PM

super fly

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Slightly high idle

Just got done timing the truck and I'm still idling a little high. Checked the TPS and its reading slightly high at idle; 1.2v. Is it possible someone may have messed with the idle set screw? Resistance at closed is slightly low too, 2.89k, but pretty much spot on at full open, between 340-350.

Sep 21, 2012 | 09:06 AM

mcarb80682

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i also would like to hear answer to this , i have 86 manual trans that is at 1000 rpm constant, is that to high , my other cars ARE ABOUT 600 to 800 max. was wondering if i should back off on idle screw too

Sep 21, 2012 | 11:25 AM

1986F150six

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Joined: Jul 2009

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From: Sheffield, AL

My 1986 with manual transmission and DS2 conversion idles happily @ ~650 RPMs.

Does your truck still have the original computer controlled carburetor and ignition?

There should be a decal under the hood by the radiator support which has the factory recommended specifications.

Sorry, I just noticed that the OP has a 1989. mcarb80682, you might want to make your own thread so as to avoid confusion.

Last edited by 1986F150six; Sep 21, 2012 at 11:27 AM. Reason: Note of possible hijack