S4 (B6 & B7 Platforms) Discussion Discussion forum for the B6 Audi S4 produced from 2003-2005 And B7 Audi S4 produced from 2005 -2008

Intermittent shake/rumble while idle...?

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Old Sep 5, 2007 | 03:48 PM
  #1  
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Default Intermittent shake/rumble while idle...?

Hope someone can help me out with this the car has been having an intermittent, what I would define more as a rumble, while at idle. Does anyone have any ideas as to what this could be?

TIA

Joe
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Old Sep 5, 2007 | 03:50 PM
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Default Milltek exhaust? It rumbles at idle for me. . .

j/k. Not sure how to help - good luck.
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Old Sep 5, 2007 | 04:03 PM
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Default You had me going there for a second...I want to get it resolved my last service is coming up next

week, I have the extended warranty after that, but I'd rather get it out of the way.
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Old Sep 5, 2007 | 04:41 PM
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Default

Try your plugs, depending how bad the rumble is. If not, coild pack perhaps? What mileage, what mod
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Old Sep 5, 2007 | 04:52 PM
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Default I have 40k on the car, the only mod's I have is the Milltek CB and sway's. Are the plugs covered

under manufacturer's warranty?
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Old Sep 5, 2007 | 04:54 PM
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Default If you dont' get a CEL, dealer WILL NOT be able to diagnose it...I guarantee this.

You're not getting one...

I can't imagine the CB is clogged up with anything.

At 40k miles, your stocker cats should be fine...


my coilpacks, the first time i had issues, were intermittent. I'd be cruising along in 6th on the hwy, then i'd feel a hickup. Sometimes, I'd get a complete 2-3 second hickup with lots of misfires, but would be ok. the Cel only came on during the longer hickups.

Record the sound with a video fo what you mean, or elaborate more upon what "intermittent" rumble means.
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Old Sep 5, 2007 | 05:01 PM
  #7  
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Default I have had this same problem since I purchased the car... The car rumbles and idles rough

Especially when the AC is on. Its definately not the spark plugs cause when i got them replaced, i had the same exact problem. Please let me know if you figure anything out because chances are its the same problem as mine.
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Old Sep 5, 2007 | 08:39 PM
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Default Could be deposits in the combustion chamber/valves, or slightly clogged injectors

Deposits will cause uneven fuel burn, which will become worse at idle when the mixture is rich.

It wouldn't hurt to try running a few tanks of fuel treated with a strong fuel treatment like Techron, BG44K ... etc.
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Old Sep 5, 2007 | 08:44 PM
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Default It could also be a vacuum leak

Does the idle roughness get worse when you apply and then release the brake pedal? If so, you could have a vacuum leak.
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Old Sep 6, 2007 | 12:17 AM
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Default Change your spark plugs, dump some Seafoam into the gas tank and drive with your foot down for

awhile. Italian tune up.
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