Hi group, I have a 2006 Dakota SLT 4.7. The idle is hunting. Usually more so at a cold start during high idle, but sometimes even after its warmed up. I already replace the IAC valve with no change. Not sure what else in the system would cause that. Any suggestions? I appreciate any help - Jim

 

Hi I'm new to the forum and a novice to average garage monkey but could it be the map sensor?

 

Hello Ace199, I suppose anything is possible right now. I will start doing some research on the map sensor and see where that leads me. Thanks for the offerings.

 

I suppose I should throw out my reasoning behind my hypothesis, I have the same truck, if its rough idle after replacing the iac to me would assume a bad air fuel mix, or timing. an air leak to me wouldnt cause as much issue on this bc it doesnt have a MAF and only a MAP sensor [correct me if it's different on your truck] if the map sensor is faulting it could be defaulting/basing fuel air more on O2 sensors. Could also be a fuel pump issue which is pricier. Another reason id try map first; the cam position sensor may be another cause but that would require a "rebalance" after touching. This is not to say you couldnt a a possible air/vacuum leak I suppose. A smoke test can be done pretty cheap with a homade smoker I made one from a soldering iron, paint can, and a bicycle pump it's on youtube. Once again I'm no pro, and someone may respond and tell me I'm way off but just food for thought

 

I'm thinking intake leak somewhere. Something is cracked, and causes a leak, but seals it's gap when it warms up. Makes me lean towards intake manifold gasket leaks. Got a friend with a smoke machine to diagnose it? Or some brake cleaner to go looking on the cheap?

Any codes?

 

I would also check/clean the throttle body. it's quite simple to get to. loosen the band clamp from the air intake tube and pull. for easier access, loosen the band clamp on the intake tube to the air box and pull.

check to see that it's seating correctly when closed. that there's no buildup of anything on the blade or around it. there's an idle passage that could be blocked.

removing the throttle body is 4 bolts, a wire or two and I think your truck is cable actuated so you also ahve the throttle cable. removing it and cleaning around there and the throttle body from the back wouldn't hurt as well.

I was surprised at the amount of buildup on mine when i cleaned it.

 

Sorry for the delay in response, but YES, it was the map sensor. Thank you.