A4 (B5 Platform) Discussion Discussion forum for the B5 Audi A4 produced from 1995-2001 B5 FAQ

Problem...rough idle....

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Old Oct 17, 2003 | 03:55 PM
  #1  
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Default Problem...rough idle....

1998.5 A4 2.8 Quattro......idle is rough ,rough until 3000 rpm. I go to the muffler and the exhaust seems to be sputtering out. Not a constant flow. Seems like it's missing at idle.
Problem only from idle to 3000 rpm. Not DTC, Car has 25,000, no mods. Anormal gas millage
O2 sensor and spark plugs replace,

I need help.

Thanks
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Old Oct 17, 2003 | 04:01 PM
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cat could be failing
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Old Oct 17, 2003 | 06:03 PM
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Default Re: Problem...rough idle....

fuel injector on number 5 cylinder
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Old Oct 18, 2003 | 07:33 AM
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Clean the throttle body first. May be a cheap and easy fix.
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