Vibration under power

jrmcm · 01-25-2011, 06:43 AM

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?

mishar · 01-25-2011, 08:37 AM

Sounds like misfiring.

jrmcm · 01-25-2011, 10:51 AM

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.

2005AUDIS4 · 01-27-2011, 07:44 AM

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

mishar · 01-27-2011, 08:04 AM

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.

AusA8 · 10-09-2011, 05:06 AM

Was there any resolution to this issue?

I think I may have the same issue...

doylfish · 11-10-2011, 07:57 PM

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

10-09-2011, 05:06 AM	#6
AusA8 AudiWorld Member Garage is empty, add now Join Date: Jan 2011 Posts: 195	Was there any resolution to this issue? I think I may have the same issue... __________________ A8 4.2 S

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01-25-2011, 08:37 AM	#2
mishar AudiWorld Super User 2005 Audi A8 Join Date: Nov 2010 Location: Vancouver, Canada Posts: 2,794	Sounds like misfiring.

01-27-2011, 07:44 AM	#4
2005AUDIS4 Audiworld Junior Member 2005 Audi S4 Join Date: Aug 2009 Posts: 58	also, i'm pretty sure that you would get the check engine light if it were misfiring. any lights or codes to speak of?

01-27-2011, 08:04 AM	#5
mishar AudiWorld Super User 2005 Audi A8 Join Date: Nov 2010 Location: Vancouver, Canada Posts: 2,794	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.

11-10-2011, 07:57 PM	#7
doylfish AudiWorld Newcomer Garage is empty, add now Join Date: Oct 2011 Posts: 2	probably coil packs or plugs..i got horrible vibration under power and a CEL when my coilpacks went