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Olivershand
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HELP! Porsche 987 misfires
Olivershand replied to Olivershand's topic in 987-1 Series (Boxster, Boxster S)
P0413, P0300 (sometimes), P0456 -
I’ve had some issues with my 2005 987.1. Whenever I quickly press the throttle, or rev match down shift, the engine misfires / stutters. My short term fuel trims are normal at idle, maybe a little lean, but spike to 25+ under high rpm acceleration. I’ve already replaced my plugs so I don’t think it’s that. I’ve replaced several vacuum related pipes and tubes so until I get a proper smoke test I won’t know if it’s a vacuum leak. I have two codes, one for a very small evap leak and the other for warmup catalyst below efficiency threshold bank 2. The engine seems to have noticeably less power at low rpms. Any idea what could be the cause of this?