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Foxwell NT530 - 07 Porsche cayman 987 rev limit lifted


Problem:

07 Porsche cayman 987 has a strange issue where it seems to be limited to about 4-4.5k rpm. Happens on hard and soft acceleration. Almost feels like traction control kicking in but it's isn't.
During one attempt to test its symptoms and it did clear for a few seconds and the car accelerated quickly. Then the engine cut out, but restarted fine afterwards.
No CEL and my cheap obd2 reader shows nothing.

Foxwell NT530 - 07 Porsche cayman 987 rev limit lifted

 

Advice:

The fuel filter is part of the fuel pump and considered "lifetime" by Porsche..

 

The cheapo OBD-II reader won't do the job. Porsches can have misfires that never set off the OBD-II/SES light. The ECU does store a record of them, but it's only really readable using a Porsche specific tool (or one capable of Porsche specific diagnostics.) That would be the first place I'd look - misfires can trigger this sort of behavior - the misfiring cylinder(s) are actually turned off to prevent fuel washdown on the cylinder walls. You also can do diagnostics on the MAF and variable-valve-timing. My suggestion for a 987 is the Foxwell NT530. Price is right (less than $160 if you ask nicely) and the software is excellent for the 957 (specifically - it's not as advanced for some newer Porsche models, but I expect it will get there..) I bought mine from the factory supplier in the US https://www.foxwelltool.com/  - send the sales email a message asking for a better price and they'll get back to you. At least that worked for me. Delivery was 2 days - in stock in the US apparently. You want to order it with one-vehicle-manufacturer included in the price, then you go to their website when you get it and download the Porsche software.

 

Credits to @ deilenberger for his positive feedback.