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idles fast, then slow, back and forth


Chuck Willis

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Jun 23, 2013
Messages
8
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Vehicle Year
1989
Make / Model
ford
Transmission
Manual
When I cold start my 86 2.9 v6, the motor fires right up, idles at 900-1000rpm for a couple of seconds, then drops to 400 rpm, almost dies, then back up to 1000 rpm. It bounces back and forth between 400 and 1000 rpm, over and over at about two second intervals until it warms up. Once the motor warms up, it idles perfectly.

A couple of ranger station experts actually helped me get this truck running, 'cause I was lost in space. When I first got it running, it idled perfect on a cold start. This fast/slow/fast/slow idling started happening a week or two after I got it going.

Any help or ideas would be excellent.:beer:

thanks, Chuck Willis
 


adsm08

Senior Master Grease Monkey
Supporting Member
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Ford Technician
TRS 20th Anniversary
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Sep 20, 2009
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Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Go get carb cleaner or gum cutter and spray out the idle valve until it starts coming out clear.
 

Chuck Willis

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Jun 23, 2013
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Vehicle Year
1989
Make / Model
ford
Transmission
Manual
Thanks adsm08, I'll try that out.
 

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