PO505 "Idle air control system malfunction"
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Professional
Joined: Jun 2009
Posts: 152
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From: High Ridge, MO
PO505 "Idle air control system malfunction"
Guessing this means the IAC sensor? Again, this will be my third. In as many months.
It is now idling high and did stall a few times several days ago. Well off to the parts store. I guess warrantied parts are like this for a reason.
Open to any other suggestions.
It is now idling high and did stall a few times several days ago. Well off to the parts store. I guess warrantied parts are like this for a reason.
Open to any other suggestions.
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Joined: Oct 2008
Posts: 214
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From: Denver Colorado
Yeah I get that too, even on my new engine. My mechanic buddy thinks that the computer is shot. I would take it to some one and have them put it on a scaner and see if they can test the IAC circuit. Just my .02
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Joined: Jul 2006
Posts: 12,204
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From: Gainesville, Ga.
they can be tempermental little bastards.
are all the new one's failing with the same code ?
and are all the new one's from the same local store, same brand ?
if so, you might be in a bad batch of them.
you might try a different brand.
i've had poor luck with autozone brand, and better luck with SMP brand (standard motor parts).
are all the new one's failing with the same code ?
and are all the new one's from the same local store, same brand ?
if so, you might be in a bad batch of them.
you might try a different brand.
i've had poor luck with autozone brand, and better luck with SMP brand (standard motor parts).
Thread Starter
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Professional
Joined: Jun 2009
Posts: 152
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From: High Ridge, MO
they can be tempermental little bastards.
are all the new one's failing with the same code ? Nope I don't believe I even got a code before just the same symptoms. Just stalling and no idle eventually. Now its a high constant idle occasionally acting almost normal but not dead steady as usual.
and are all the new one's from the same local store, same brand ?
if so, you might be in a bad batch of them.
you might try a different brand.
I've had poor luck with autozone brand, and better luck with SMP brand (standard motor parts).Yep Autozone. Too cheap/broke to pay again at a different store while there is a warranty, but maybe I have run threw the bad batch. The local only has about two in stack at any given time.
are all the new one's failing with the same code ? Nope I don't believe I even got a code before just the same symptoms. Just stalling and no idle eventually. Now its a high constant idle occasionally acting almost normal but not dead steady as usual.
and are all the new one's from the same local store, same brand ?
if so, you might be in a bad batch of them.
you might try a different brand.
I've had poor luck with autozone brand, and better luck with SMP brand (standard motor parts).Yep Autozone. Too cheap/broke to pay again at a different store while there is a warranty, but maybe I have run threw the bad batch. The local only has about two in stack at any given time.
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Professional
Joined: Jun 2009
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From: High Ridge, MO
Mind elaborating on the process you used? I really wanna get it solved.
Hall Of Fame
Joined: Jul 2006
Posts: 12,204
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From: Gainesville, Ga.
one of (the severa) times i bought an an autozone IAC and installed it, it was better for a couple of days and then started surging at cold idle again. i swapped it under warranty. same cycle of better, then problems. so i returned it and told them the brand/batch was no good and got a refund. went across the road to advance and got a new one. same cycle of failure. swapped it under warranty, same cycle. hmmm. no codes. hmmm. one day i got a P0123 regarding TPS. hmmm. so i replaced the TPS and the cold idle surge went away. i felt like a dumb ***.
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Joined: Nov 2025
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From: Georgia
Po505 with good idle
I have a po505 that idles good at 600 to 700. I was having to hold the throttle down for a few seconds at start up to get the idle good but, I fixed the vacuum leak and now it idles good at start up. I traced the wiring from the IAC to the PCM. They all four ohm out good. Installed a new Mopar IAC. The code po505 won't go away. What am I missing?
