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Okay I'll try this again I have the 2008 audi a4 sline 2.0 t fsi 6 speed manual quattro. the engine sounds loud as if two weeks ago. like sticking a potato in the exhaust pipe. or its seeing heavy load. at an idle the car shakes. the car was completly normal a few weeks ago. its an american car for the record. production was germany and not mexico. I have scaned ecu. no codes no cel. mass meter reading good. boost good. o2 readings good . hell all the sensors are reading normal. car still pulls strong. fuel econemy still good. but engine sounds like it wants to blow up where two weeks ago it purred like a kitten and my teeth didn't rattle when at a stop sign. this is my 4 th vw audi vehicle and all previous cars I had tuned. so I know my way around the cars. this probl em however I'm lost. this car is stock. last year had the same issue audi did fuel pressure switch recall and intake secondary throttle body recall. that didn't fix problem several months later wastegate acuator rod broke in half and I drove the car for a year with no boost. finaly fixed the rod and car ran fine all summer. now its getting cold and the loud engine noise and rough idle are back. is thus pcv? manifold throttle body? cat? bad mufflers? I'm sick of crapy german engineering. I put 6 grand in the last audi for poor quality factory parts. help help or I'm buying a mustang

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Check the High pressure fuel pump tappet by removing the high pressure fuel pump and pulling out the tappet/cam follower these have a tendency to wear out prematurely also where that tappet rides on the cam it wear out the cam lobe as well. the 2.0T has been there worst engine to date (in my humble opinion) unfortunately.

Posted on Jan 05, 2014

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