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Old 06-12-2020, 08:43 AM   #5
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Location: O.C. CA
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Originally Posted by hstephenson View Post
I recently replaced the heater control valve and OAS while i was in there. The car ran fine for about a week. now throwing 300, 302, 304, 306 misfire codes. can anyone give me an idea what to look for. cannot find any vacuum hoses loose.

2003 Boxster S
Misfire is usually caused by ignition related parts, Ignition coil, spark plug oil fouled from failed AOS ?? I believe the code numbers indicate which cylinder is misfiring so check cyl.# 2, 4,& 6 for oily spark plugs
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.

Last edited by BYprodriver; 06-12-2020 at 08:47 AM.
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