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Misfire only p0304
According to my aeroforce interceptor, I get a misfire p0304 only when driving in 4th or 5th gear when just cruising along with a little bit of gas (90 octane)
It only registers on the interceptor, and only displays the count (3 times so far) but not in the DTC section. Car just had westers update and my afr is good now but I occasionally get high 4s on the KR. Otherwise car runs great for only having 90 octane. I pulled the plugs last week and they looked great.
So, my question is should I even worry about this isolated cylinder misfirethat does not even stick around to set a DTC and CEL? This is a returnless system correct....so maybe the crappy 90 octane with contaminates is to blame. I have read of one hhr ss with only p0304 and it turned out to be a bad exhaust valve and seat. Crossing fingers it's not that.
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2008 GXP - Aggressive - Manual - All Options
Westers Tune, GMPP CAI, MBRP Heat Shield, MBRP Charge Pipes, SOLO S/R Exhaust, AeroForce Interceptor Scan Gauge
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