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Starting and Idling Problem, P050ab code.

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Old 27 Nov 2015, 05:32 pm
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Default Starting and Idling Problem, P050ab code.

I recently acquired a 2006 Cruiser with 67000 miles on it. It's the regular 2.4 manual. It runs fine at speed but has trouble starting unless I give it gas and will stumble and almost die when at idle. It just smogged and they replaced the MAF sensor. I thought it might be a throttle body problem so I cleaned the throttle body. Another symptom is that it has a higher pitched wheezing sound when revved up, not sure if it could be a vacuum leak. There are no oil leaks or coolant leaks that I can find.

Autozone gives this description for the codes:

Cold Start Idle Air Control (IAC) System Performance

Possible Causes:

Air inlet duct is collapsed, loose or air filter element is clogged

A parasitic load on the engine

Base engine problem (i.e., compression or misfire condition)

MAF sensor is dirty, out-of-calibration or it is "skewed"

Throttle plate, throttle shaft or linkage is damaged or sticking

ECM has failed

Anyone have any ideas? I'm concerned it might be a cracked head or a bad valve, so I'd like to rule out anything else before I pull everything and do a compression check.
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Old 27 Nov 2015, 06:28 pm
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Join Date: Aug 2015
Location: Lake Wales, FL
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Default Re: Starting and Idling Problem, P050ab code.

With you saying it has a high pitched sound, it seems to me like your most likely culprit is a vacuum leak. Get some carb cleaner and start the engine and let it idle (if it will) and start spraying around the throttle body and intake. If there's a leak, when the carb cleaner hits it, the idle should change noticeably.

Hey, hey I wanna be a rock star.
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