Question about 1986 Ford F150 SuperCab

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My truck doesnt want to idle when its cold

Its a 1986 f150 extended cab with a 5.0 fi .once it warms up it idles ok.

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If it is carbarated, adjust the choke to run more richly.

Posted on Apr 15, 2010

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Posted on Jan 02, 2017

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I'm assuming the truck runs ok once it is warmed up. Sounds like you need to make some adjustments. The cold idle speed is set too high, and the choke is opening too fast. The cold idle should be around 1500 rpm and the choke should take at least 90 seconds to open depending on air temp.

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You need to adjust the automatic choke. Your choke may not be opening fully. There is a fast idle cam linked to the choke to keep the throttle open more until the engine is warm. The idle mixture screw is part 37 in the picture, but get the choke adjusted right first, and you may not have to adjust the mixture screw. See adjustment procedures at link beloe.


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Repair Guides Carbureted Fuel System Carburetor AutoZone com

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1 Answer

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When its warmed up, in park or in gear, RPMs are about 600-650 at warm idle. At cold its about 850 or so, Good luck and thank you for using Fixya

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