A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Idle shakes when AC is on

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Old 10-12-2005, 08:49 PM
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Default Idle shakes when AC is on

Everytime I turn on my AC, the idle shakes. Brought it into the dealership 2 times, each time they said something was wrong. After changing them, the problem is still there. Don't feel like going back to the dealership and getting charge for something that won't fix the problem so I've decided the ask the experts on Audiworld. Does anyone have any idea or similar problem?
Old 10-12-2005, 08:59 PM
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Motor mounts/snub mount/tranny mounts?
Old 10-13-2005, 03:16 AM
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Default my car does this too

2001 1.8t with 76,000 miles
Old 10-13-2005, 03:48 AM
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Default Does the idle speed change when the A/C comes on?

TBA and/or raise idle will help. The other thing is the engine is suppose to know when the A.C is on so that it can apply more power something might be wrong there.
Old 10-13-2005, 10:23 AM
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Default Re: Does the idle speed change when the A/C comes on?

Well doesn't seem any spike in power when the AC is on. Idle just shakes and notice when I roll up/down my window, this shakes the idle too. heck all of the mounts and looks good to me. At first the dealership change the mass air flow sensor, then they said it was the AC compressor. After charging me alot of money, problem still persist. Can it be a power problem? I would bring it back to the dealership but they just going to charge me for something else and still not fix the problem.
Old 10-13-2005, 10:27 AM
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Well TBA and raising idle is darn near free, so I would try that first.
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