Question about Audi A4
Vacuum problems, idling problems or the likes may cause the car to shake. This is because the combustion does not occur properly or the idling is wrong or both. You may want to check first the minor items such as vacuum hoses as they are cheap to replace which can be a source of the hissing sound.
Like you mentioned the secondary air injection can be the problem. You can inspect the actual valve. At times the gasket can be an issue but the gasket comes when you buy the valve as far as I know. Check also the solenoid if it is working properly. It may also cause the problem.
Posted on Jul 31, 2009
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Posted on Jan 02, 2017
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