no911Dave

Apparently some other brands of cars using direct injection only for fuel delivery (no supplemental port injection) can develop very dirty intake valves (the back side). It is presumably due to the lack of cleaning effect fuel delivery by port injection has on the valves. I think the main symptoms are rough running and poorer fuel mileage, and I believe it doesn't show up until 40,000 miles or higher. Is this an issue with DI only Caymans?

I was semi-seriously looking for a 2009+ (to avoid possible IMS bearing and engine oil return issues) Cayman S, but if the specter of engine removal for valve cleaning is very real, I think I'll have to remain P-car-less! Thanks everyone.

noCaymanDaveToo

If I missed this being addressed in threads that my search didn't catch, my apologies in advance.

zedcat

The 2,9l engine 2009-12 is not DFI. My Cayman R has 48k mi and runs fine. Lots of track miles.

RennKit-Dave

Simian

[QUOTE=no911Dave;15226459I believe it doesn't show up until 40,000 miles or higher. Is this an issue with DI only Caymans?

[/QUOTE]
Those are typically in turbo cars and installing a catch can can resolve the issue. I had a BMW and it was a common issue.

However, with NA motors it doesn't seem to be that big of an issue. I've also heard that the Porsche AOS will help prevent the issue as well.

Joe Henley

No911Dave,

There are plenty of threads around about the problem. Just Google "987 DFI problem." I was interested in this issue as I have a 2010 BS. After searching and reading, I concluded it's a "maybe" issue -- maybe you'll have it, maybe not. I never saw any reasonably accurate predictor for it. What I did see was that for those who develop the problem, the cure is easy and relatively cheap (for a Porsche).

My advice is to ignore the problem in your buying decision. Enjoy the car. Deal with the problem IF it ever crops up.

Good luck!

Joe Henley

RennKit-Dave

Unfortunately just moved and gave away my 20 year Excellence collection. No known service bulletins on the '09 CS DFI. I have read some early Bosch HP pumps were presenting problems and that part number 9A1 110 315 02 was superseded with 03. Also some claim that the engine should have an oil change at 5000 miles. Others claim that a good quality gas should be used. Could not find any pictures showing 9A1 DFI motor internals with a problem.

Latest 2009 Porsche Cayman Technical Service Bulletins

• 2009 Porsche Cayman Equipment Service Bulletin 376339NHTSA Item Number: 10056330
  Service Bulletin Number: TI-41-14
  
  Date of Bulletin: Jun 26, 2014
  Component: Equipment
  
• 2009 Porsche Cayman Electrical System Service Bulletin 369896NHTSA Item Number: 10055907
  Service Bulletin Number: TI-58-12
  
  Date of Bulletin: May 16, 2014
  Component: Electrical System
  
• 2009 Porsche Cayman Power Train Service Bulletin 359553NHTSA Item Number: 10052517
  Service Bulletin Number: TI-90-11
  
  Date of Bulletin: Jun 13, 2013
  Component: Power Train
  
• 2009 Porsche Cayman Power Train Service Bulletin 336333NHTSA Item Number: 10044980
  Service Bulletin Number: WC-07-09-12
  
  Date of Bulletin: Jul 09, 2012
  Component: Power Train
  
• 2009 Porsche Cayman Steering Service Bulletin 326394NHTSA Item Number: 10043332
  Service Bulletin Number: TI-35-09
  
  Date of Bulletin: Jan 17, 2012
  Component: Steering
  
• 2009 Porsche Cayman Power Train Service Bulletin 326395NHTSA Item Number: 10043332
  Service Bulletin Number: TI-35-09
  
  Date of Bulletin: Jan 17, 2012
  Component: Power Train
  
• 2009 Porsche Cayman Unknown Or Other Service Bulletin 308589NHTSA Item Number: 10038544
  Service Bulletin Number: PK-D8-16
  
  Date of Bulletin: Mar 02, 2011
  Component: Unknown Or Other
  
• 2009 Porsche Cayman Electrical System Service Bulletin 280472NHTSA Item Number: 10033142
  Service Bulletin Number: TI-53-09-2
  
  Date of Bulletin: Jun 01, 2009
  Component: Electrical System

no911Dave

Thanks for all the feedback everyone, it was very helpful!

8 LEGS

My mechanic complains about this issue all the time and says he sees it consistently on higher mileage direct injected engines. I have a '12 Carrera GTS and a '16 Spyder. No issues yet but still low miles on each.

Marine Blue

ekam

Miles just add to the accumulation on the injectors, not necessarily the cause of the issue.

Targaone1

the cayman s models are direct fuel into cylinder injection. The base cayman 987.2 is plain old intake / behind valve fuel injection.