2008 A4 - Extremely Rough Idle

[hagerty47]

On my way to class just now and I'm pulling in and I notice the car idles extremely rough.



I took a video from my phone so hopefully it shows up.

I'm hoping it's the coil packs but from how aggressive it is I think it may be the PCV. I'm not too sure so if someone could watch the video and try to point me in the right direction that would be awesome.


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[Luis_Heineken]

Scan the car, come back with the codes

[Denio24]

make sure your dipstick is seated all the way in? Sound like a vac leak to me.

[hagerty47]

Scan the car, come back with the codes

Forgot to mention, it's not throwing any codes.


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[hagerty47]

make sure your dipstick is seated all the way in? Sound like a vac leak to me.

Checked the dipstick and oil cap, both were seated correctly.


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[JMKAUDI]

This happened to my car a while back and it would only idle real rough occasionally for a few minutes and then run normal. Once it happened I changed the spark plugs and coil packs, ran fine for a while and then I started getting a high idle and my N80 purge valve was bad. replaced that and has been running fine ever since.

Would definitely look into the plugs/coils and the $10 N80.. the N80 takes literally like 10 minutes to replace.

[Denio24]

There may not be any check engine lights, but there may be stored codes. Did you scan with vcds?

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