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Misfire & MIL

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I tried to read old topics to get some information but didn't find any solution from those.. Im getting MIL and what I have noticed this happens only in high revs(5000->) under load(overtake or so).

Codes(text taken from DIY menu):

P1117 - O2S Heater 1 Behind Catalytic Converter

P1121 - O2S Heater 2 Behind Catalytic Converter

P0300 - Random Misfire DetectedP0301 - Cylinder 1 Misfire Detected

P0304 - Cylinder 4 Misfire Detected

P1313 - Misfire, Emission Related, Signal Implausible Cyl. 1-6

O2 sensors are new but that didn't help. Next what I could think of is coils or air leak somewhere.. any Ideas?

Car is -97 Boxster 2.5 and all this started to happen after ims/rms/clutch repair any possible relation? Also, I have a possibility to log diagnostics, just dont understand much about them. Any value I should keep eye on?



Edited by nsn
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I also answered your PM.

Before checking air leak swap coil packs to see if problem follows the coils. Make sure they click when reconnecting.

Mine does not give a CEL under heavy load. In other words I can put mine in a high gear/low RPM and hold wide open and no CEL. It pulls great. Mine only lights up when driving very aggressive and running into or close to redline.

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