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Join Date: Apr 2018
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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.
Old 04-22-2018, 01:17 PM
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Without looking up the codes, I would think it sounds like you have an airflow sensor problems so you're not getting the right mix in the engine.
Old 04-22-2018, 02:26 PM
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Did you find out what was going on with your car I am having the same problems with 04 911
Old 08-14-2018, 02:21 PM
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The reason of P0335 OBD-II Engine Trouble Code is Throttle/Pedal Position Sensor/Switch A Circuit Intermittent.
P0335 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

The reason of P0336 OBD-II Engine Trouble Code is Throttle/Pedal Position Sensor/Switch A Circuit Intermittent.
P0336 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

The reason of P1226 OBD-II Engine Trouble Code is Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
P1226 DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.

hope can help you....
Old 08-14-2018, 10:40 PM
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