getdealtwith
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A few months ago, my mechanic replaced the IAC on my 04 Navigator (5.4 32V) with an aftermarket unit. It's the same type the Expys use.
Idle control has been fine until I recently cleaned MAF and intake air temp sensor as my MPG is still really crappy on this SUV. I used MAF cleaner as usual.
Afterwards, I noticed that I started getting a sticky, lagging high idle. If I roll to a stop sign and shift into N, RPMs jump to 1200 to 1500 and the IAC takes 3-4 seconds to regulate air intake down to 750RPM. If I stay in D, this high idle will push the truck forward so I have to brake harder.
When I unplug the IAC, idle drops much quicker and more like on my Expedition.
I removed the unit to inspect it and it's clean and seems to function OK. I also replaced the MAF with a quality part since the problem started after I cleaned it. There are no vacuum leaks or codes.
Has anyone had a new aftermarket IAC go bad on them? Or could this be a PCM issue? Before I swap parts with my Expy or buy a new one, thought I'd post this here to see if others have encountered this same issue and how they fixed it.
Idle control has been fine until I recently cleaned MAF and intake air temp sensor as my MPG is still really crappy on this SUV. I used MAF cleaner as usual.
Afterwards, I noticed that I started getting a sticky, lagging high idle. If I roll to a stop sign and shift into N, RPMs jump to 1200 to 1500 and the IAC takes 3-4 seconds to regulate air intake down to 750RPM. If I stay in D, this high idle will push the truck forward so I have to brake harder.
When I unplug the IAC, idle drops much quicker and more like on my Expedition.
I removed the unit to inspect it and it's clean and seems to function OK. I also replaced the MAF with a quality part since the problem started after I cleaned it. There are no vacuum leaks or codes.
Has anyone had a new aftermarket IAC go bad on them? Or could this be a PCM issue? Before I swap parts with my Expy or buy a new one, thought I'd post this here to see if others have encountered this same issue and how they fixed it.