Quote:
Originally Posted by hellokitty
Are you misfiring on the same cyl consistently? Logs appear to be within reason (but I didn't do a deep dive). I just reviewed it high-level.
Common causes you've already addressed such as coils and plugs. Your AFR appears to be in check so that rules out injectors and o2 sensors.
The only thing I can really think of is poor octane. California 91 is pretty junk (I'd know, I lived there before they stationed me abroad.)
Perhaps you can try adding 2-3 gallons of E85 and see if it happens again...
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It hasn't thrown a code in a while so idk which cylinder it is. But when it used to throw them it was either cyl 5 or 6. Another thing is that I intermittently get an SES (at random times not near misfires) with code 2C31 (Lambda probe front catalyst, adjustment control) and for whatever reason my catalyst, evap system, and oxygen sensor monitors always seem to be "incomplete", caused me to fail smog. Could any of this be related? I only use 91 from chevron/76.