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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1200



PostPosted: Fri Jan 12, 2018 10:55 pm    Post subject: 2008 cayenne 4.8T check engine issue Reply with quote

Have a check engine light on our 2008 cayenne turbo

Was intermittent (sometimes came on and then cleared itself) but now on all the time. Engine seems a little sluggish and down on power.

Code is P0016 which relates to cam/crank position correlation issue. I've replaced the cam hall sensor on bank 1 (left side of v8 as viewed from front of car looking into engine bay) and cleared the code and performance seems better but after a 5 mile drive and a check with code reader I've noticed that the same code is pending and I assume the check light will return.

Any ideas of other possible causes?

I've read perhaps a failing variable timing solenoid or one that's dirty or partially blocked could cause this? I think the car is just about due a service.

TIA
 
  
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kas750
Estoril


Joined: 31 Mar 2013
Posts: 3713
Location: Chorley lancashire

2006 Porsche 911

PostPosted: Fri Jan 12, 2018 10:59 pm    Post subject: Reply with quote

A friend of mine had a similar problem and it was a stretched timing chain which was causing the problem.
I’m not sure if your engine is prone to that?
 
  
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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1200



PostPosted: Fri Jan 12, 2018 11:36 pm    Post subject: Reply with quote

Cheers

We've had a cayenne before for nearly 10 years and 100k driven and I don't think chain stretch is something they are known for.

I don't have the test equipment for analysis of this and indeed hope there's nothing going on like that inside.

Perhaps a good service first and clean of cam actuator solenoids (perhaps swap them side to side and see if issue follows to that bank) as first port of call?

Would a failing crank position sensor give the same issue? Just wondering if its momentarily not giving signal while the engine is running then cam correlation to it would be off? (Doesn't explain why it's only bank 1 though and not both)
 
  
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deMort
Reims


Joined: 21 Mar 2015
Posts: 4270
Location: Brighton


PostPosted: Sat Jan 13, 2018 4:12 pm    Post subject: Reply with quote

Yes im afraid the chains do stretch , you can see it on a tester if you look at cam deviations on each Bank.

One side will be worse than the other as its further away from crank.

This will normally cause uneven idle , a general lumpyness basically.

For a fault code to be generated it would have to be pretty bad .. ive seen stetched ones but never one to that extent .. normally the variocam can compensate for it .

First thing then is to check and see what the devations are .. most ive seen have been 12 degrees .

Big question .. have you had any misfire codes or do you have a tester that can show real time misfires as they occur and if so are they only on one bank ?

Reason being ive just had a very strange fault on one that at first glance was looking like a chain but turned out to be a very differnt sensor indeed .

Crank position sensor can become loose .. just have a quick look and make sure its tight .

A single failed cam sensor wont cause a problem and its not uncommon to see it , you will also have a fault code for it .


EDIT

Some info if you havent already seen this ..

https://www.obd-codes.com/p0016
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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1200



PostPosted: Sat Jan 13, 2018 6:54 pm    Post subject: Reply with quote

Thanks for the info Demort

I will have a look at the crank sensor if I can locate it (underneath on these?). There's no lumpiness at idle and no misfires at all recorded and it feels smooth, just a little down on power (which i assume is due the the Check light being on and timing being held back)

The only code was p0016 and i swapped out the cam sensor on left bank (assuming that is bank 1).

My code reader can see live data and I noticed there's two separate fields in there for advance. At a guess I would need to rev it at 2500 and hold steady and check the results. The field isn't marked cam advance (simply timing)

Can the variocam actuators get sluggish or stick on one side with dirty oil and can they be swapped bank to bank to see if the code changes to follow??
 
  
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deMort
Reims


Joined: 21 Mar 2015
Posts: 4270
Location: Brighton


PostPosted: Sat Jan 13, 2018 7:16 pm    Post subject: Reply with quote

CPS is underneath and more to the n/s ,

I dont think your reader can see what im thinking .. its called camshaft deviation and will be a set figure .. ie 8 degrees .

What you have is probably just cam timing .

The fault code is basically saying the CPS is seeing the camshafts in the wrong position from what it expects at various rev ranges .

Yes the actuator could in theory be stuck .. i would have thought you would get a fault code if it was but its certainly worth checking .. im not sure if there is a drive link for this ( you activate it with engine running to test ).

Ive not had any problems with these on a Cayenne before though so dont have any real experience of what faults they could generate.

The fault code you have is a generic one , OBD , and not the Porsche specific one .. if its possible then someone like 9E to use their tester and get the Porsche fault code and see what the devations are .. a half hour check basically ... if doing that then ask that Matt has a look and mention i sent you .
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Harv
Suzuka


Joined: 18 Sep 2014
Posts: 1200



PostPosted: Sun Jan 14, 2018 9:20 pm    Post subject: Reply with quote

I'm giving it a general once over at the moment.

Front bumper off, intercoolers cleared of rubble and a birds nest! Rad cleared of leaves etc (thinks it's a 996!)

Ive put fresh Mobil 1 and a filter on and have taken the intake manifold off to swap the starter motor and discovered a small leak from the metal feed pipe which will need a new seal.

We noted the thermostat has been stuck open as the car over cools when on the mway so I'm swapping that too.

Assuming here that I need to remove the water pump to get the thermostat out but can't see how the metal feed pipe block comes off the top of the unit. Any ideas?

Also noted that the vacuum t line on the back of the manifold link pipes is broken so will have to fabricate a fix there.

Once it's all done and back together I may pop down and see you if you can check the cam deviation ( You are right next to the bluebell railway arnt you?)

I do have a printout from OPC at Mid Sussex of the codes but I can't read the file
Cars eh!!
 
  
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