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Old 11-13-2013, 01:49 PM
tredmd tredmd is offline
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Location: Chicago
Join Date: Aug 2012
Posts: 3
Mein Auto: 2007 328xi
2007 328xi E90 N52 Rough Idle and stalling - Smoke Results

The short version goes like this.

Valve Cover leaking onto exhaust - had gasket replaced along with plugs and I've had a running issue ever since. Car surges and nearly stalls (sometimes does) when coming to stop and I know after searching everywhere that this is a common issue with all sorts of causes.

Check engine light is on with the following codes -

2D06 Air Mass System
2D29 Pressure Difference - Suction tube Plausibility
29E1 Mixture Control 2
29E0 Mixture Control
29D0 Misfire #4

I've been told that the most likely fix is to replace the valve cover itself. It is my understanding that the pvc system and crankcase vent valve are all part of the valve cover.

So before I go ahead with this I smoked the car today to check for leaks. There is only one place that is leaking - it's coming from a tiny valve/connector type piece off of the valve cover. Nothing connects to the end of this piece - it just has a little guard around it that is able to slide up and down a bit.

Is this piece suppose to be able to breathe like this? Should smoke be exiting the system here?

I did have an ever so slight idle issue before replacing the valve cover gasket, but nothing like it is now. Is it possible the breathing system was disrupted during the gasket replacement and now needs to just be replaced?

Thank you in advance!
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Old 01-12-2014, 09:37 PM
mars5887 mars5887 is offline
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Location: CT
Join Date: Jan 2014
Posts: 16
Mein Auto: 07 328xi
Hey Tredmd,

Did you replace your valve cover? Did that solve your problem. I am having similar problems on an 07 328xi. Accompanied by loud whistle.
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Old 01-13-2014, 06:43 AM
tredmd tredmd is offline
Registered User
Location: Chicago
Join Date: Aug 2012
Posts: 3
Mein Auto: 2007 328xi
some how I lucked out here...

After using a smoke machine on my car and seeing that little plastic breather leaking. I removed the some of the oil and gunk on the clip covering the tube. The clip had three long prongs that appeared to allow it to slide up and down on that breather.

Found some gunk on it and cleaned it. Put the clip back on and insured that it moved freely. Put the car back together and no more issues. Car runs fantastic!

Now I don't have a clue if that's what fixed it. Anythings possible - and not knowing if that clip is suppose to freely move up and down... The way I see it is that there is vacuum in the intake and that vacuum sucks that clip down to seal that breather. Then for whatever reason should there be back pressure then maybe that pressure is allowed to exit that breather. Makes sense. But for all I know its a dust shield.

Anyway I didn't have to replace the intake. Thank god. Save me a ton.

mars5887, if you are hearing a whistle there is a leak. That leaking is definitely the cause of any running issues you may be having. You should be able to smoke test the system and see whats going on. You can see how to smoke the system on you tube. Pretty straight forward but you may have to disassemble the top covers over the engine to see where the leak is.

But first things first. Make sure your oil cap is tight. Also make sure the gasket on the cap is all there. Just my thoughts.

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