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Discussion Starter #1
2003 Coupe CC has thrown a few P0300 codes in the past couple months. Always during startup. Anyone else experience this?
 

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No, what is the code? Is it the gas cap one? If so then yes mine threw it once.
 

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Discussion Starter #3
No, mine through the evap codes, too - P0300 is random engine misfire, and usually with P030X (individual cylinders). Only happened twice, and then, only at startup after sitting 2 days or so.
 

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I don't know about the Maser specific misfire codes, but I know here in Minnesota, if you've had a BMW, VW, Audi, or any other car with fairly high compression, if the car misfires once on a cold January morning, the check engine light is coming on, and its a random misfire code. Re-start the car a few times, drive it for a bit, and the light turns off. (that doesn't mean there isn't a huge line at all of the above said dealerships a few times per winter)

I think modern knock \ misfire sensors + the tendency towards higher compression motors means this is going to happen more often. It's basically just the first cylinder that fires on start happens to half-fire and then the motor lights.
 
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