'98 A4 2.8 Rough Idle - Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 and more!

01-03-2008, 01:10 PM

#1

johughes

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'98 A4 2.8 Rough Idle

Watching the tach, it can't seem to stay put, but wanders a few rpm up or down at idle. It also sounds like it's missing randomly, and I can feel it shudder slightly when the rpm dips.

Should I check the spark plugs? Dirty throttle body?

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01-03-2008, 04:34 PM

#2

wailshark

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Re: '98 A4 2.8 Rough Idle

How many RPM does it wander. It normally does wander a little bit but any variation of over 200RPM is too high IMO.

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01-05-2008, 01:32 PM

#3

sikhest

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Re: '98 A4 2.8 Rough Idle

my dad's a6 does the same thing...any thoughts on what it could be?

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01-05-2008, 04:31 PM

#4

Black_RS4

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Re: '98 A4 2.8 Rough Idle

when was the last time the fuel filter was replaced? Plugs?

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01-09-2008, 06:45 PM

#5

kentr8561

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Re: '98 A4 2.8 Rough Idle

Quote:

Originally Posted by Black_RS4

when was the last time the fuel filter was replaced? Plugs?

There is a DIY on AUDIZINE I believe to clean the idle control valve on a 2.8. I'm going only by memory, but it's worth checking out,it's free.

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01-09-2008, 09:56 PM

#6

analogue_lover

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Re: '98 A4 2.8 Rough Idle

Yes, my 1991 Passat di the same thing. Do a FULL tuneup, put in grea toil, clean out the idle motor, etc. Mine evened RIGHT out, and ran much smoother, to boot! Just my 2 cents. o2 sensor was geeting lazy, too!

Mike