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07-01-2012, 03:33 PM
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#1 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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Idling issue. MAP or IAC?
Trucks 89 v3500 454 tbi. 4 speed.
It starts fine and will sit and idle for 5-10 mins then stumble and die. It drives fine. Even crusing at 65-70 it runs fine. Now if I come to a stop sign or stop light I have to keep blipping the throttle or it dies. Any ideas? Oh and the previous owner messed with a screw on the front of the tb that's by the throttle. The more I screw it I'm the more open the butterfly's are etc. about where should these be set? Completely closed? Slightly opened? Thanks Larry Posted via Mobile Device |
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07-01-2012, 05:52 PM
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#2 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: Idling issue. MAP or IAC?
If it does it only after it's hot and driven, I would suspect a sticking EGR valve. Remove it and clean it. Reset the air idle valve too. The tip over time needs adjusting for proper air flow at idle.
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07-01-2012, 06:23 PM
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#3 |
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Registered User
Join Date: Mar 2011
Location: Cincinnati Ohio
Posts: 55
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Re: Idling issue. MAP or IAC?
Where is the egr valve located and what's the safest way to clean it.
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