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Engine Idle fluctuations with A/C on!

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Old 06-12-2016, 03:28 PM
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2013 c250
Engine Idle fluctuations with A/C on!

Hey Guys!
So when I'm at a light or whatnot, and the air conditioning's on, the RPM's bounce from 600 to 1,000. Normally, it's steady at 600. I replaced my alternator pulley a year or so ago to combat a potential A/C compressor failure. Is this a compressor thing? Or possibly a loose hose somewhere? Not sure. Would like input if you have any.
Thanks!
Old 06-13-2016, 09:41 AM
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You don't have a belt issue----you have issues with the throttle valve actuator which controls the idle speed--when advised by AC\ECU that the compressor was just turned on------get a good scan and watch out for the scammers!!
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Old 06-13-2016, 02:44 PM
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Thank you Plutoe! So even without an error message, the idle fluctuations w/ the A/C on could be the throttle valve actuator? If so, do you think a thorough cleaning would do the job or needs to be replaced?

Last edited by scottonfire; 06-13-2016 at 02:54 PM.
Old 06-13-2016, 04:04 PM
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You can try that,but you need a scan to confirm the paranormal diagnostics!!
Old 06-13-2016, 04:17 PM
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I had a feeling it was due to aliens. So I'll assume it can be diagnosed on an OBDII?
Old 06-13-2016, 04:51 PM
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Well you can also try that,however if your dash aint lite up---the OBD scanner aint worth S----you need someone who knows the ECU circuit, because all you have know is an unfaulted symptom!!
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Old 08-18-2016, 01:15 PM
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Now I got one P0238. Turbocharger Boost Sensor A Circuit High. Would I still need a star scan or is this enough info. to find what's wrong?

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