Mike997t

Hey guys, I've got a friend's 2009 997tt 3.6 that is misfiring on cylinders 4,5, an 6 and also is throwing a p0018 code for Crankshaft Position - Camshaft Position Correlation (Bank 2). Car has 67k miles on it. My first thought is that it's either the cam sensor or the variocam solenoid on that bank. To my understanding the variocam solenoid can be switched out and re-diagnosed to see if the problem has switched to the other side. I will also be replacing the coil packs and spark plugs which ive done on the 3.8tt, but first I want to address the P0018 code. Has anyone come across this issue or seen anything common in relation to that code?
Or is there anything further I should be aware of? All feedback appreciated.
-Mike

neanicu

Do not throw parts at it. A proper diagnostic is key.
Unfortunately correlation codes in 997 tts might very well be related to a spun camshaft sleeve.

https://rennlist.com/forums/997-turb...-camshaft.html

lliejk

I had been doing a bunch of reading on this. Neanicu is correct, getting the diagnosis is key before you start throwing parts.

If you do go down the road of spun camshaft, there have been several posts about the actuator. One quote I saved was:

"Each of those cam actuator selenoids are about US$ 250-300 per side. It is worth replacing them before going through the trouble of bringing down the motor. Sometimes, replacing the oil alone can clear any debris that could get stuck in there."

I have not organized all the information I have been gathering about this issue, so I don't have a solid diagnostic procedure yet, but others may be able to direct you. I will do some more research and if I find anything useful I will post it.

Ed

Mike997t

Thanks guys. He needs plugs and coils due to mileage, but that's a separate issue considering its misfiring on 3 cylinders at the same time and all on one bank. my first step was going to be swapping the actuators rechecking the codes to see if its swapped to bank 1. Im hoping its not a spun cam, I doubt my buddy has the money for that at the moment...Plus, I haven't had to go that deep into one of these motors before =/

lliejk

Here are a couple of posts to check:

https://www.6speedonline.com/forums/...mil-p0018.html

Here's a generic write up of the code:

https://www.obd-codes.com/p0018

Another one with some information:

http://www.planet-9.com/987-dme-diag...362-p0018.html

More generic information on P0018:

http://www.troublecodes.net/pcodes/p0018/


Ed

vbb

https://rennlist.com/forums/997-turbo-forum/847001-spun-camshaft-18.html#post13789623

The above thread was a wealth of knowledge for me. Post #267 in the thread is me talking about resolution of my issue. Good luck to you and your friend.

Mike997t

Really appreciate the feedback! Hoping my buddy is as lucky as you were. Best first step i'd imagine would probably be swapping bank 1 and 2 actuators out to see if the problem switches to bank 1. Oil was changed about 2500 miles ago.

Kevin

Mike, as mentioned above.. Swap the actuator solenoid bank to bank. And see if the CEL comes back on in 300 to 500 miles. I have a recent customer that did have the actuator solenoid go bad, so he did dodge the bullet.

I am also responding to this thread to encourage folks to think about getting a aftermarket Fidelity or Easy Care warranty while it is available for our cars...

bruni911

bruni911

That's was a service record that I found when the PO had this issue years ago.
Hope that helps.

neanicu

I'm surprised Porsche wouldn't have bi-directional control on the PIWIS2 for these solenoids. Why would the technician have to go through the trouble of swapping solenoids?! It's not exactly easy on this car. Just have a couple PIDs : Desired and Control. Done.

Macster

Pretty sure those instructions come from Porsche. I know from talking to the techs they sometimes have to follow procedures that seem to be a waste of time but they have to in order for Porsche to decide the problem is real and then come through with in one case a new engine. The techs knew off the bat the engine was sick, sick enough to justify replacement -- under warranty -- but Porsche had them try various things until afterwards nothing helped and Porsche then said it would send an engine over to replace the bad one in the car.

neanicu

Yes,you are correct,but this car is not under warranty. In this case,the diagnostic goes under flat rate,meaning it pays for a certain time the technician has to identify the problem. He can follow a manufacturer flow chart,which are usually junk or identify the problem at his discretion if he can beat flat rate.

Mike997t

Well guys the verdict wasn't too pleasant. I changed the oil, swapped the variocam solenoids and also replaced the bank 2 cam sensor (my price was only $30 bucks so i figured what the hell). The car still has the pending code for p0018 (crankshaft sensor correlation to camshaft signal bank 2) but CEL has not come back yet. The car seems totally fine except for when it gets back to idle. Drove the car and it has all the power it would regularly but gets rough again as soon as you come to a stop. Oil pressure is within range as well. i I"m wondering if the sleeve on the camshaft has spun, not allowing oil to pass through to get to the variocam solenoid? -_-