Question about Chevrolet Cars & Trucks
The idle is too high in park it is at 1100 rpm, and in gear at about 700rpm. The only way it will drop is by shutting off the truck for a few seconds and then it drops, but as soon as it is driven it will go into high idle again. The fuel consumption has also increased alot.
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Posted on Jan 02, 2017
IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.
Posted on Sep 21, 2008
a vacuum leak will cause a high idle due to he fact more air is entering the engine which the computer will compensate by adding more fuel. also, a faulty fuel pressure regulator will increase fuel pressure delivering more fuel than required.
look for broken or detatched vacuum hoses. check fuel pressure; 30-50psi
Posted on Apr 09, 2010
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