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Car is not accelerating properly

Tiny
CONRADM
  • MEMBER
  • 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!
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Thursday, May 31st, 2012 AT 11:08 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light and when was last tune-up? Go to this walk thru link: https://www.2carpros.com/articles/engine-has-low-power-output
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Thursday, May 31st, 2012 AT 11:20 AM
Tiny
EXOVCDS
  • MECHANIC
  • 1,883 POSTS
2.0L FSi?

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

Hole in orange diaphragm. See attached image.

Thomas
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Thursday, May 31st, 2012 AT 2:17 PM

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