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- - '98 A4 2.8 Rough Idle (https://www.audiforum.ca/a4-b5-typ-8d-1994%962001-75/98-a4-2-8-rough-idle-14998/)

johughes

01-03-2008 01:10 PM

'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?

wailshark

01-03-2008 04:34 PM

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.

sikhest

01-05-2008 01:32 PM

Re: '98 A4 2.8 Rough Idle

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

Black_RS4

01-05-2008 04:31 PM

Re: '98 A4 2.8 Rough Idle

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

kentr8561

01-09-2008 06:45 PM

Re: '98 A4 2.8 Rough Idle

Quote:

Originally Posted by Black_RS4 (Post 57731)

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.

analogue_lover

01-09-2008 09:56 PM

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

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