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Shaking in idle

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Old 12 Apr 2013, 09:46 am
Fresh Cruiser
Join Date: Jan 2013
Location: St. Petersburg, FL
Posts: 4
Default Shaking in idle

My 05 shakes sitting in idle with the A/C on, but not with the A/C off. I have already replaced the CMP with a new one from the dealership. Any other ideas on what could be causing this to happen? Thanks.
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Old 12 Apr 2013, 09:55 am
Obsessed Cruiser
Join Date: Sep 2001
Posts: 27,744
Default Re: Shaking in idle

The A/C puts a strain on the engine, the computer is supposed to bump up the idle 100-200 rpm's to help with that, also the radiator fan should come on whenever the compressor is engaged as in A/C or Defrost mode. Is the fan coming on and does the RPM's increase?
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Old 12 Apr 2013, 09:58 am
Veteran Cruiser
Join Date: Mar 2012
Location: darien il
Posts: 4,592
Default Re: Shaking in idle

any other symptoms? does the idle get lower? does it run hot?

a little more vibration is normal. the alternator is working harder because the cooling fan is on high and the compressor also puts a little more work on the engine.
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Old 16 Apr 2013, 08:04 am
Fresh Cruiser
Join Date: Jan 2013
Location: St. Petersburg, FL
Posts: 4
Default Re: Shaking in idle

I finally got around to trying to figure out the problem at home. I sat in my driveway with the car on my rpm's where about 800 rpm, then I turned the A/C on max. As the car shook the rpm's went up to 1000 then fell back to 800. I couldn't see whether or not if the fan was coming on by looking at.
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