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Audi0405
Audi0405, Technician
Category: Audi
Satisfied Customers: 10670
Experience:  10 years in Vw and Audi Field
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2008 Audi Q7 Shaking With Check Engine Light On.

Customer Question

When the 2008 Audi Q7's AC was turned on the car started shuddering at a red light so I turned off the AC. Now the Check Engine light is on.
The car just seems to run rough in general when the AC is on, like it misses. But this is the first time it has actually "shook".
Why is this happening?
Submitted: 8 months ago.
Category: Audi
Expert:  Audi0405 replied 8 months ago.
Most likely you have a ignition coil that is starting to fail. The car starts to run rough because the AC will put more load on the engine and cause the issues you are having. Have the ignition coils checked for causing a misfire in one of the cylinders. I hope this helps.
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