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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Surging idle

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Old Feb 24, 2016 | 07:26 AM
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Peavey1986
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Surging idle

So my 86 f150 302efi has been surging really bad at idle. I was thinking about the idle air control valve , I have cleaned it before an that helped for a bit . Would it be worth checking or just replace it. The truck dose have a 302ho out of a 88 mark vii if that makes a difference.
 
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Old Feb 24, 2016 | 07:31 AM
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Being it did the trick once I would try it again.
I would also clean the port where it bolts on to, to make sure it is open.


I would also check the fuel PSI just to make sure it was with in spec and not adding to the issue.
Dave ----
 
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Old Feb 24, 2016 | 08:17 AM
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Sometimes, a surging idle can be caused by a vacuum leak.
 
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Old Feb 24, 2016 | 09:29 AM
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I have checked for leaks don't see anything. The engine was rebuilt with all new stuff about 6 months ago . Did all new vac lines and intake gaskets . I am going to clean it after work today. If that doesn't help next I'll do a smoke test
 
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Old Feb 25, 2016 | 07:12 AM
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So I cleaned it an BAm the truck idle amazingly smooth now!! Maybe I'll just get a motorcraft unit just to have for spare. Thx for the help
 
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Old Feb 25, 2016 | 07:57 AM
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Good to hear it was an easy fix and thanks for posting back what you found and the fix as it can help others.
Dave ----
 
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