Question about Audi A4

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While in drive and coming to a stop the car starts to vibrate or shake a bit due to low idle. when the car has the heater or air on the idle bumps up a bit and the problem is gone. can i raise the idle 200-300 rpm?

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Yes, you can increase the idle to about 1000 rpm, but I would recommend a tune up as it sounds like you may need one.

Rough idle can be caused by many different things - you need to always start with a basic tune up; spark plugs, fuel filter and air filter, as the vehicle will not perform well if any of these three are bad. Then check all vacuum lines for cracks or breaks and replace as needed. You can also add a fuel injector cleaner into the gas tank. I recommend the black bottle of STP concentrated fuel injector cleaner, and you can purchase that at most Wal-Mart's. Hope this helps. Have a nice Monday :O)

Posted on Apr 04, 2011

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