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ruff idle

Old 05-05-2009, 11:37 PM
1st Gear
Thread Starter
Join Date: Jan 2009
Location: St Charles, IL
Posts: 19
Cool ruff idle

My A4 3.0 has a bit of a ruff idle when I come to a stop. The idle comes back up and runs smooth until the next stop. Last month I replaced 4 coil packs and 6 new plugs. I got better millage but the ruff idle is still there. I have read other comments about coil packs or a vacuum leak. Last year I installed the Hyperflow intake, which is a K/N type air filter. I seemed to notice this issue after I installed it but was not sure if I had the problem all the time. I did check to see if the original air box had a vacuum assist that would need to be plugged but no luck.

Any suggestions what I might look for? Should I carry a few coil pack in my trunk?
Old 05-05-2009, 11:40 PM
Dylan19's Avatar
1st Gear
Join Date: Feb 2009
Location: Chicago Suburbs
Posts: 142

i keep spare coil packs in my trunk. 8 actually. i have 4 hitachi e's and 4 of the standard ones that you get from audi
Old 05-06-2009, 07:13 AM
Pablo_Ottawa's Avatar
2nd Gear
Join Date: Feb 2007
Posts: 765

Things to check:

Dirty MAF
Clogged fuel filter
Dirty throttle body
Check the air filter and breather system for any obstructions
Faulty sensor SOMEWHERE. Audis have tons of them
Run a scan and see what faults come up
Old 05-06-2009, 07:27 PM
audiprotein's Avatar
3rd Gear
Join Date: Sep 2006
Posts: 2,254

and a cracked snub mount
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