Question about 1991 Audi 100
When i drive my car, cold start when i slow down the engine makes a humming noise and at the same time the rev go up to 1500 then comes down the same thing even happens when the car is running at a normal temperature.
Sounds like the ISV (idle stabilizer valve) is screwy...Take it off, spray some carb cleaner in it..refit it, if it doesn't work replace it.
Posted on Sep 18, 2009
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Posted on Jan 02, 2017
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