CEL on Cold Starts (P0300)

Originally Posted by bebenegro

Hey everyone,

So for a few months now I've been getting a CEL (P0300). My only mod is Stillen Gen 3 Intakes. I haven't taken it to the dealer for a couple of reasons, main reason being that I've figured out how to "avoid" it - but not fix it altogether, second reason being that I've read way too many stories about dealerships switching everything blindly without knowing what they're actually doing.

So the strange thing about my case is this: I've figured out that on the first start of the day (or after more than 5 or 6 hours of not using it) if I turn the car on for approx 10 seconds, turn it off, then turn it back on again immediately after, the light wont come one. However, if I turn on the car in the morning or in the afternoon after a while (again, lets say 8 hours) of no use, the light will come on.

Any ideas on what the hell may be wrong?!? Seems like a fairly specific scenario, but so far (locally) no one has been able to give me an answer.