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219 Posts
1999 Ram, 5.9L, auto, 4x4
I just replaced the IAC valve on my truck 'cause it wouldn't idle and figured the IAC was bad. Now the truck idles at 1800 rpm and I can't get it to idle down to normal. I did the proper IAC adjustment which calls for driving at 40 mph to allow ECM to learn the setting. I unhooked the battery for a few days hoping it would reset the ECM, that didn't work. I took the NEW IAC back to the parts store and exchanged it for another one, still idles at 1800. What else should I check? I didn't see any vacuum leaks.
Thanks for your help.
I just replaced the IAC valve on my truck 'cause it wouldn't idle and figured the IAC was bad. Now the truck idles at 1800 rpm and I can't get it to idle down to normal. I did the proper IAC adjustment which calls for driving at 40 mph to allow ECM to learn the setting. I unhooked the battery for a few days hoping it would reset the ECM, that didn't work. I took the NEW IAC back to the parts store and exchanged it for another one, still idles at 1800. What else should I check? I didn't see any vacuum leaks.
Thanks for your help.