2002 C4S with P0021

[Newfarm]

Hello, I really hope someone here might be able to help me figure this out.

Recently I got a CEL and drove the car to Porsche locally. They hooked it up and found a few codes, one was P0021 and the other one for one of the lambdas. The tech said the lambda one could most likely just be from the fact that the timing was off.

We decided to clear them and see if things got better on their own. The cell hasn't returned, but today I got my durametric cable and was able to have a look in there myself.

The P0021 is back, but not the lambda one (hence the lack of a CEL I presume).

Some info on the car and milage:

Milage at the moment: 115.000 KM

New engine: 104.000 km (from a German indy (albert motorsport))

New oil pickup: 105.000 km (about the same milage as the original P0021 first came)

New AOS: 105.000 km (about the same milage as the original p0021 first came)

New chain tentioners: 109.000 km

Anyway, there's something that seems to be a bit off, attatched are some screenshots of actual values while the car was idling tonight. I have a suspicion that the timing is a whee bit off on one of the cams (intake?). As is, the deviation is obviously out of the +/- 6 dgrs range but should only be about 3 degrees out of actual spec on the cam itself if I've understood how this actually works.

Also, this is a X51 3,6l if that changes anything at any point.

Edit; was a new AOS that was put in at 105k km, I'm not all that fluent in german so had a friend look at the paperwork today and turned out it was the AOS. Live and learn!

Edited August 19, 2011 by Newfarm

[Loren]

DID you check that camshaft adjuster bracket on that bank? They are know to crack and give erratic readings.

[Newfarm]

Nope, haven't really checked anything physical. My garage is a whee bit too tight to get this car up on the jackstands I have, is this bracket accessible from the top or sides or something?

My technical abilities are probably a bit higher then what I'm probably giving the impression of here, but I've only had this car for about 4 weeks or so and don't really know it that well yet :-).

[Dharn55]

OK Loren, now you have me going. What are you referring to as the camshaft adjuster bracket?

[logray]

I think he may have just meant camshaft actuator....? might explain why cam bank 2 deviation is -12.

Or perhaps just a bad cam sensor?

[Newfarm]

Any good way to test that actuator logray ? Are we talking the "Oh my what happened there" kick of the variocam at 5800 rpm or so? Because those I should be able to activate directly in durametric and get a fairly lumpy idle if I've understood what I've read correctly.