Question about 1999 Dodge Ram

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I have a 1999 ram 1500, and it idles high at 1200rpm. Had the shop clean it out with no or same results. They recomended to change the IAC valve but said it was not a guarantee it would work. Also, when i put it in drive it idles at 1200rpm and gets to speed of 25mph., so if i wanted to go slower id have to ride the brakes. Should i replace the IAC valve? Or HELP?

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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

  • jpksbay Apr 14, 2011

    Thanks, Ill get on it before i start replacing parts unneccessarily. Ill let u know the results. Oh, the engine light is on, could it be that part (IAC)?

  • Jeff Turcotte
    Jeff Turcotte Apr 14, 2011

    Not sure what is putting the engine light on, but I would find out before going any farther. If you can get the trouble code and send to me, I can be a lot more specific about troubleshooting steps. You can get a free scan at your local parts chain.



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