Timing issues , Help required please !

[Toby Ford]

Hi Guys , Im new on here and require some advice . Im a technician in a garage in cornwall . my boss has a 2008 boxster S M96.25 2.7 . Well one of the head gasket went on him and he wanted us here to carry out the work to it . So engine removed both the head gaskets were changed , all using genuine porsche parts , we bought the correct timing kit  (laser 4717) and we had the timing proceger . the engine has gone back in and starts ok !. BUT . when reved it missfires on bank 2 4-6 . fault code stored are = P0018 - Crankshaft - Camshaft  Position Correlation And  = P0304 P0305 P0306 cylinder missfire . ok so ive turned crankshaft to timing mark U6 and pined , and my canms aline with setting bar at rear of cam .. im alitte stuck at this point so any advise would be gratefully received . thanks Toby .

[JFP in PA]

Hi Guys , Im new on here and require some advice . Im a technician in a garage in cornwall . my boss has a 2008 boxster S M96.25 2.7 . Well one of the head gasket went on him and he wanted us here to carry out the work to it . So engine removed both the head gaskets were changed , all using genuine porsche parts , we bought the correct timing kit  (laser 4717) and we had the timing proceger . the engine has gone back in and starts ok !. BUT . when reved it missfires on bank 2 4-6 . fault code stored are = P0018 - Crankshaft - Camshaft  Position Correlation And  = P0304 P0305 P0306 cylinder missfire . ok so ive turned crankshaft to timing mark U6 and pined , and my canms aline with setting bar at rear of cam .. im alitte stuck at this point so any advise would be gratefully received . thanks Toby .

 

First of all, welcome to RennTech :welcome:

 

If you actually blew a head gasket, yours if the first one I personally have ever heard of doing that.  These engines use multi layer steel head gaskets that are actually stronger than either the head or the engine case, and they never fail.  Usually, if one of these engines demonstrates conditions normally associated with head gasket issues, it is a cracked cylinder head. 

 

I would start by confirming that the cam position sensor on bank two is correctly connected, and that the cam position sensor is actually functioning.  If you have access to a Porsche specific scan tool (PIWIS, Durametric, Autologic), you should be able to read the real time cam position values as well as deviation values at idle.  If bank 2 has no values, the cam position sensor has a problem.

[Toby Ford]

Hi and thanks . l have checked cam bank 2 cam bank 1 and cranksensor all on pico oscilloscope , all working correctly with good pattens , theres a ticking/ tapping noise on Bank 2..  (sounds like swril flaps ticking type noise) ..  vvt ? out ?? .. im not sure thanks for your help !

[JFP in PA]

Hi and thanks . l have checked cam bank 2 cam bank 1 and cranksensor all on pico oscilloscope , all working correctly with good pattens , theres a ticking/ tapping noise on Bank 2..  (sounds like swril flaps ticking type noise) ..  vvt ? out ?? .. im not sure thanks for your help !

 

You could be on to it, as the car is both a VarioCam+ and variable valve timing design, one (or both) of those systems may not be getting sufficient oil flow.  The oil passages in the both systems are very small, so it could be some left over debris has gotten into one and is the problem.

[Toby Ford]

Hi Many thanks for your help . and sorry for the late reply , ive been in hospital and not been to work for 5 weeks . anyway back on this porsche again now . Im allmost covinced its to do with the vvt . if im to be honest i probley used to much sealer on the cam cover so blocked oil ways could be the answer , i have also undone the center nut on that cam .  30mm with the 17mm bolt ?. dose this have to be reset in the corect position ?. as we stand its in the workshop with bank 4-6 cam cover removed the vvt solinoid recoved and cleaned , also the holes in the cam has been blown out . is there anything else i need to be checking wilst striped on the ramp ? . many many thanks toby

[JFP in PA]

Hi Many thanks for your help . and sorry for the late reply , ive been in hospital and not been to work for 5 weeks . anyway back on this porsche again now . Im allmost covinced its to do with the vvt . if im to be honest i probley used to much sealer on the cam cover so blocked oil ways could be the answer , i have also undone the center nut on that cam .  30mm with the 17mm bolt ?. dose this have to be reset in the corect position ?. as we stand its in the workshop with bank 4-6 cam cover removed the vvt solinoid recoved and cleaned , also the holes in the cam has been blown out . is there anything else i need to be checking wilst striped on the ramp ? . many many thanks toby

 

If you are referring to the fasteners that hold the VarioCam+ drive on the end of the cam, the answer is possibly yes.

[Toby Ford]

Is there a correct way to re-set this up ?.  thanks toby

[JFP in PA]

Is there a correct way to re-set this up ?.  thanks toby

 

Yes, it is called "cam allocation", and covers several pages in service manuals, and requires some special tools as well.  As Porsche stopped printing this information several model years before your car was built, you (or your technician) would need to obtain it from Porsche's  online subscription service at http://www.renntech.org/forums/links/goto/18-porsche-piwis-tsi/

[pocholo1968]

Hello everyone .
As you'll see I'm new to the forum and introduce myself , I live in Florida and have a boxster 987 2006 to buy with a breakdown of lack of compression for open valves do not closed .Repair heads and I have the same problem as the colleague start theme , failure P0018 faulty cylinders 4,5 and 6 .
I checked the timming and is correct .
I wonder what was the solution he found his colleague because the post is not closed with the solution.
apologies for the English and I write with a translator
Any help is appreciated in advance .

[JFP in PA]

Hello everyone .

As you'll see I'm new to the forum and introduce myself , I live in Florida and have a boxster 987 2006 to buy with a breakdown of lack of compression for open valves do not closed .Repair heads and I have the same problem as the colleague start theme , failure P0018 faulty cylinders 4,5 and 6 .

I checked the timming and is correct .

I wonder what was the solution he found his colleague because the post is not closed with the solution.

apologies for the English and I write with a translator

Any help is appreciated in advance .

 

Welcome to RennTech :welcome:

 

P0018 - Crankshaft position with respect to bank 2 intake camshaft.  The code is telling you that the relationship between the crankshaft position and that of the intake cam on bank 2 is not correct.  If you have verified that the cam allocation on bank 2 is correct, and that you now have full compression pressure in all of the cylinders, then I would suspect the either the cam or crank position sensor is bad, and would also suspect that it is the cam sensor; so I would start there.

 

[pocholo1968]

I check compression on all cylinders and 200 psi were all even and I did before starting.
I still change the camshaft sensor 

could exchange it with another bank?then will be fail the other bank.

[pocholo1968]

could  be the cam-adjuster?

[JFP in PA]

could  be the cam-adjuster?

 

It could be either the cam position sensor (which you can swap sides to test) or the VarioCam unit it self.