Rough idle/shaking when A/C is turned on at a stop
03-01-2005, 10:00 PM
#1
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Rough idle/shaking when A/C is turned on at a stop
I've noticed this with my car and I was wondering if anyone else experienced it as well. I have 9k miles on my car... When I come to a stop, with the a/c off, it's pretty smooth, but the instant I turn on the a/c, it idles really rough, and you can feel the car shaking and get louder.
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
03-01-2005, 11:25 PM
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Originally Posted by nlpamg
I've noticed this with my car and I was wondering if anyone else experienced it as well. I have 9k miles on my car... When I come to a stop, with the a/c off, it's pretty smooth, but the instant I turn on the a/c, it idles really rough, and you can feel the car shaking and get louder.
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
03-01-2005, 11:49 PM
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2002 C230 Coupe(M111)
Originally Posted by nlpamg
I've noticed this with my car and I was wondering if anyone else experienced it as well. I have 9k miles on my car... When I come to a stop, with the a/c off, it's pretty smooth, but the instant I turn on the a/c, it idles really rough, and you can feel the car shaking and get louder.
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
What's wrong? Is it normal? My old C280 would do this somewhat, but this is slightly harsher than it and I really didn't notice it on my C280 until it got to a higher mileage...
03-02-2005, 09:26 AM
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2009 Porsche 911 Carrera S
Originally Posted by nlpamg
When I come to a stop, with the a/c off, it's pretty smooth, but the instant I turn on the a/c, it idles really rough, and you can feel the car shaking and get louder.
Do the revolutions come and stay down about 100-150 RPM? If thats the case, then probably the engine management system is not compensating for the additional and substantial load caused by the A/C at idle speed. Take it in for service and and explain your findings.
