Rough Idle

[Tristen]

I recently bought an 06 A4 Avant Q S-line 2.0 Tip and when the car is at idle, it seems a little rough compared to my 07 A4 2.0 I just turned in. I noticed a difference after driving my 07 back to the dealer today. The previous owner replaced the motor mounts and crankcase valve (???) but I think it's still rough in comparison. The gas mileage is also not as good.... I'm sure it could be many things but any thoughts???

[SEXICÄN]

My car sometimes had a rough idle, but i just ignore it....lol

[Tristen]

Yea.... but this cars should not idle this way. Especially after owning three A4's...

[2871mds]

I have the same car and I totally agree I changed numerous parts and still the same to tell you the truth it sucks and even dealers don't know what the problem is for an Audi this sucks I owned three Audi's and never again will I buy another Audi .the car idles like sh.....

[IceMole]

B6s used to get idle issues right before a coilpack took a crap. I haven't blown one in the b7 yet...knock on wood

[2871mds]

For an "Audi" there is no way this should be acceptable and I hope there is a fix for such an annoying problem ,I bought my A4 for not only style but also comfort.

[rudtf]

check to see if the previous owner improperly installed a snubmount

[virgsa4]

My 08 seems to idle kind of rough sometimes too, I was thinking of taking it in. I first need to try to figure out in what conditions it was more likely to do it, so the dealer doesnt just blow me off and say nothing is wrong.

[Sanjman]

get fuel injection service done (might be a ripoff but it doesn't hurt to try)...
maybe a mild tuneup...
check your oil dip stick for sludge... maybe you want to try seafoaming your car... into your gas tank and into oil and other places (check the DIY section)
check your PCV