View Full Version : Help confused on idle shake

01-17-2019, 04:09 PM
Hey fellow B5ers. Today i'm working on getting my b5 A4 1.8t fwd tiptronic car up to par (younger brother is learning to drive so perfect chance to get him into audis). I have put the b5 on the backburnner for about a year now (I'm now more active in the A3/S3 8V chassis. Currently with a stage 2 S3). Anyways i'm having this issue of the car kind of bogging/shaking once the revs come back down to idle. I have no idea what the issue may be. The motor was redone about 2.5 years ago but the motor itself has no more than like 1.5-2k miles since the rebuild. I've attached a video of the issue since i'm not sure how to describe it exactly. Thanks for any input!

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01-17-2019, 04:18 PM
My FWD is doing the same thing but not this much. Its kind of normal tbh. There are couple of maps in the ECU that adjust idle reserve, idle speed etc. Since this is a DBC it should have an idle control valve , I would check that and if its fine you got nothing to worry about.

01-22-2019, 12:02 AM
Check coil pack connections

Snub Mount and bracket

Engine mounts

My best guess fr id bet money itís the puck PCV valve or a major vacuum leak. Based on that symptom id almost guarantee it

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