Vibration under power

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Jan 25, 2011 | 06:43 AM

#1

jrmcm

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Vibration under power

I'm gonna cross post this message in the B6 S4 forum as well...
I'm having a very noticeable rapid vibration when under engine power. This occurs while moving or stopped, in gear or not (B6 S4). It's felt everywhere in the car (seat of the pants, shift lever, steering wheel). When under power while moving I can feel it, dropping it out of gear (and thus to idle) makes it completely go away, or I can feel it while sitting stationary and revving the engine. I'm also noticing a change in exhaust sound (aftermarket, Borla). Any thoughts on this?

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Jan 25, 2011 | 08:37 AM

#2

mishar

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Sounds like misfiring.

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Jan 25, 2011 | 10:51 AM

#3

jrmcm

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Quote:

Originally Posted by mishar

Sounds like misfiring.

If that were the case, I would think it would vibrate at idle as well. Yet it doesn't.

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Jan 27, 2011 | 07:44 AM

#4

2005AUDIS4

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also, i'm pretty sure that you would get the check engine light if it were misfiring. any lights or codes to speak of?

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Jan 27, 2011 | 08:04 AM

#5

mishar

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Not necessarily. Bed spark plug can still manage to fire on idle and loose it under load. I believe it won’t trigger any warning.

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Oct 9, 2011 | 05:06 AM

#6

AusA8

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Was there any resolution to this issue?

I think I may have the same issue...

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Nov 10, 2011 | 07:57 PM

#7

doylfish

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probably coil packs or plugs..i got horrible vibration under power and a CEL when my coilpacks went

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Tags

a8, acceleration, audi, b6, engine, exhaust, gear, intermittant, load, problem, s4, shudder, vibrate, vibrating, vibration, vibrations

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