Mechanics

CAR IS NOT ACCELERATING PROPERLY

2003 Audi A3 • 171,000 miles

My car stutters at about 3500-4000 rpm's.
it feels like it is struggling for power, replaced ignition coils (ouch) and spark plugs but still no luck, 2 'mechanics' could not find the fault and both had put it on diagnostic test, I feel it could be something on the ignition system but thats an uneducated guess, please please help!
Avatar
Conradm
May 31, 2012.



Do you have a check engine light and when was last tune-up? Go to this walk thru link: http://www.2carpros.com/articles/engine-has-low-power-output


Rasmataz
May 31, 2012.
2.0L FSi?

If yes, could be a broken diaphragm in the bypass valve.

Hole in orange diaphragm. See attached image.

Thomas


Tiny
Exovcds
May 31, 2012.