Rough idle - Audi Forums
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post #1 of 11 (permalink) Old 02-12-2009, 12:40 AM Thread Starter
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Rough idle

Hey gang: My Dad has a 2007 A4 2.0 turbo that has had an idle vibration since new (about 20K mi). He has had it in the shop 5 times (different shops) and they all say it is normal. He has had probably 15 Audi in his lifetime & currently owns a Passat with the same engine (although set transversely) and it is smooth as silk. I also have had numerous Audi and VW products and this isn't normal. This happens at idle when in gear only and is worse when cold. I have Vagcom-ed it numerous times and there are no issues. Anybody else having this problem?

Thanks!

Uppi
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post #2 of 11 (permalink) Old 02-12-2009, 04:55 PM
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i had the same problem about a month ago. it was an extremely cold day so i figured thats the reason why it happened. i just shut the car off and started it back up again and it worked fine and has since.
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post #3 of 11 (permalink) Old 02-12-2009, 11:31 PM Thread Starter
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Interesting. I have had my BMW 528 do that a time or two. This however is a very consistent vibration only at low idle under load (in gear). Has remained very consistent since new; slightly worse when cold but eases some as the car has been driven for a while. I am a little suspicious about the durometer of the subframe mounts as this is similiar to a problem I had with a '98 Passat with worn subframe mounts. In the 2008 model year they seem to have it fixed; smooth as silk.
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post #4 of 11 (permalink) Old 02-13-2009, 01:58 PM
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holy cow finally someone that has the EXACT and I mean EXACT same issue that I do. I have a 2002 Audi A4 with 50000 miles on the motor and 100000 miles on the body. Mine started this winter and the colder it is outside the worse it is. I can still feel my vibration when its hotter outside but its very very subtle so its not really noticeable. But mine vibrates so hard when its cold outside that you can hear it vibrating stuff in the dash. I'm going to have mine taken in at some point to see what all they can find. go to this link for the thread that i started at another forum:
possible A4 idleing problem - AudiForums.com

please let me know if you find anything
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post #5 of 11 (permalink) Old 02-14-2009, 01:39 AM Thread Starter
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Great thread on the other forum! I am having this same problem to a greater degree (than on my Dad's car) on my '98 Passat. I have checked the resistance on my coils and they are all in spec. I have cleaned the MAF and the TB. I am getting no "miss" codes (or any other codes for that matter) and my knock sensors and O2s are reading voltage (Vagcom). My snub mount looks ok but I am going to check it out again tomorrow. That idea makes some sense though as it is what loads when the engine torques up or down under load. I think I will try to isolate it with a low durometer pad between the rubber snub bushing and the snub housing and see if it makes any difference. My motor mounts look perfect. I checked the tranny mounts per the book and they check out (suppose that doesn't necessarily mean they are good). I also have a suspicion related to my sub-frame mounts and I am going to change them out (they are cheap and not to difficult). I will keep you updated.

Uppi
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post #6 of 11 (permalink) Old 02-14-2009, 08:49 AM
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If don't mind me asking can you tell me how you checked the resistance on your coils? I have dug threw the internet a ton and can't seem to find out exactly how to do it? And if you could keep me informed it would be great. thanks
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post #7 of 11 (permalink) Old 02-15-2009, 05:15 PM
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I had someone post a really good thread to my question about checking to see if the coils are going bad and how you can test them yourself.

The url is: coil testing on audi a4 - AudiForums.com
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post #8 of 11 (permalink) Old 02-16-2009, 05:59 PM
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normal vibration

Not sure of the cause, but this little vibration at a stop while in drive is absolutely normal. It's strong enough that you can actually see the steering wheel vibrate a bit. I just bought my A4 a week ago and test drove several after the salesperson said, basically, "that's just the way it is." He was right--it was the same in every car we drove (2006-2008).

I also have a 2007 Passat wagon with the same engine, but no vibration whatsoever. It's a bigger car, though, not as sporty in terms of suspension and the engine is mounted differently.
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post #9 of 11 (permalink) Old 02-16-2009, 11:02 PM
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very interesting ....well the vibration developed i guess you could say... and sometimes it so bad i feel like it is shaking my car apart(thats only when its really cold outside). I am curious though if you noticed something else in test driving the audi's: did you notice much vibration while driving? Mine also has a vibration that is driving me nuts at highway speeds only and i've spend hundreds and hundreds on it. Thanks for the input though. I've done some extensive coil testing and haven't really found anything at this point. The only thing i've found is a really crappy looking snub mount.
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post #10 of 11 (permalink) Old 02-20-2009, 07:30 PM
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oday a technician that has worked on audis alot told me to check the intercooler tubing at the lowest point which is just behind the bumper on the passenger side right in front of the tire. That tubing is from the intercooler and he told me that on audis especially as the turbo gets older builds up oil in the tubing and eventually it backs up into the motor and causing a rough idle. Any ideas or photos letting me know where the tubing is or if this has helped anyone.
Also I checked the tubing everywhere that I can see it and I can't find anything wrong. Something said something about a valve being bad somewhere. PLEASE HELP ME
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