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Old 04-21-2018, 11:25 AM   #1
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Boxster skips at high rpm

03 Boxster S. I noticed that the car had to be turned over longer than usual to start a couple days ago and I didn't think anything of it. I did notice a new sound coming from what seemed like the right side of the car in front of the dash. It sounded like something trying to adjust itself over and over. It kind of sounded like the flaps in the air vents adjusting and not finding a stopping point and then re-adjusting. Yesterday went out and car cranked fine and drove to the gas station about 5 miles with no problems. After leaving station I got about 3 miles down the road and there was a hesitation like I took my foot off the gas then put it right back on. After about another mile it started to fumble and loosing power to a point that I pulled over. After pulling over it was idling rough and wouldn't take any gas but didn't shut off. I turned the car off then restarted the car and now it will run fine until you hit 4500 RPM then it starts to fumble again until you lower the RPM then fine again. From where the sound was coming from it seems like it could be the fuel pump or relay. Maybe it is getting enough fuel for the lower RPM range but at higher RPM it isn't getting enough. It threw codes P0335, P0336, and P1266. Anybody have this before or have any ideas where to start looking. Seems odd that it happened right after getting fuel.

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Old 04-21-2018, 02:12 PM   #2
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P1266: Check with your dealer your DME may need a reflash to correct a bug with the DME's code that shuts down the fuel pump at the wrong time.

Also check your fuel pressure and the connector on the crankshaft position sensor.
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...

Last edited by Paul; 04-21-2018 at 02:15 PM.
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Old 04-21-2018, 02:34 PM   #3
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So if the DME had a bug in it, it would just start having problems after working perfectly before? Can I check the fuel pressure with the Durametric?

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