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Popping on Deceleration

superfans
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superfans Member

superfans

Posted
Posted

Car is 996 C4. Exhaust is popping when declerate. Mechanic found an exhaust leak but fixed it already. Exhaust still have a little bit of popping. I've found some articles on the web which said that popping on deceleration could be caused by a faulty "air injection diverter valve" :D . Does 996 have one? Any views?

1999Porsche911 Member

1999Porsche911

Posted
Posted (edited)

The air diverter valva eon the 996 is for the secondary air pump and should not cause a problem because there is a check valve inline. Get out a vacuum gauge and hook it up to one of the vacuum lines and see what your reading is on a warm engine at idle. Might aid in determining an air leak.

What year car is it?

Edited by 1999Porsche911

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