Question about 1999 Dodge Ram
Hi, my guess is you have a vacuum leak and the IAC valve cannot adjust low enough. Your mechanic is lazy. You have to troubleshoot to find the problem--not just change parts. If the valve wasn't working, you would probably have the engine light on--is it? If it is, I would get the truck scanned to see what the computer has found. If not, I would take the IAC off and plug the port passages with a rag (rag needs a big tail so it doesn't get sucked into engine). It the truck will idle down, then I would test the IAC for proper operation. If it will not idle down, I would pull other hoses off the intake manifold one at a time and plug their ports with my thumb until I found one that will let the truck idle down when plugged. Once finding the problem port, I would trace the hose back to find the leak or faulty valve. If there is no port that you can plug that will let it idle down, suspect the intake manifold gaskets are leaking. Please let me know if you have questions, and thanks for using FixYa.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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