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p2074 terrible idle fluctuating rpms

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Old 27 Feb 2014, 05:21 pm
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Join Date: Feb 2014
Location: louisa Virginia
Posts: 2
Default p2074 terrible idle fluctuating rpms

Hey everybody, this is my first post as I am a new member. I've been having problems at idle. Pulled fault code p2074. Car will fluctuate idle between 1000-1500 rpms, with steady throttle it will fluctuate about 50rpm up or down. Exhaust sounds terrible. Its a 2009 n/a automatic with about 90k miles. Since I got that code I've replaced the map, tested the tps, cleaned the throttle body and tested (only with throttle cleaner) for vacuum leaks. Everything I can see is fine. I am really confused on this one, any suggestions are much appreciated
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Old 27 Feb 2014, 05:25 pm
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Join Date: Feb 2014
Location: louisa Virginia
Posts: 2
Default Re: p2074 terrible idle fluctuating rpms

Also I do have a video of these problems in action, it's on YouTube but I don't know how to add a link. It's titled p2074 idle problems pt cruiser.
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Old 01 Mar 2014, 12:13 am
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Join Date: Jan 2013
Posts: 1,266
Default Re: p2074 terrible idle fluctuating rpms

Dave; I'd start by replacing the PCV valve. Check for any vacuum leaks. Check the wiring to the TPS and the map sensor.

cold idle =~ 1200 rpm
hot idle =~ 750 rpm
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