Porsche Cayman 3.4 2009 Rough running

[JonTurner]

Good evening,

I am looking at a Porsche for a colleague at work. The fault is rough running.

Vacuum system checked and ok, Smoke test ok, Compression, coils Plugs ok.

It idles fine until the throttle is blipped, then runs like a bag of nails, turn off then back on runs fine again until the throttle is blipped.

Im convinced its a cam issue, due the my o2 readings which plummet on bank 2 when fault occurs.

My question is what am i looking for on a scope (new to scopes 29 years in trade though), or even easier anyone had this issue!?

thanks for reading,

Jon.

[Technician]

Hi Jon,

Care to share your scope data!

[JonTurner]

Hi,

I have not got any, I wanted to know what type of reading am I looking for on a flat 6 with 2 Cam soleniods?

My thought is both readings should match from the solenoids at any Rpm?

Thanks
Jon

[landroverman1958]

Hi Jon,what about the fuel pressure pid does it alter on acceleration?also what about the air flow response when the throttle is actuated?Why not carry out an acceration test and see the reaction response wise from the O2^s and the fuel pressure and air flow.

[speck]

Hi,
Landroverman has given you a good test to do. I also would connect a secondary on the bank you think
is faulty one. Have a go and post some data, and all will have a better idea.
speck