well, i have a 4th cylinder misfiring code p0304, car acts the same way, when you start it, whether its cold or not, the idle is reeeaallly rough. as if it wont make it. i rev up the engine a lil bit a couple times and it goes away. its a pain in the ass, and i really dont know what to do. i went to the dealership and apparently the guy there has 13 years of experience of telling ppl its their fault. he didnt help whatsoever, and he was really complaining cuz i have a header on it he had a problem with that lol. i recently replaced my head gasket hoping it was the problem, because of the misfire and cuz my car was eating coolant more than gas... well i replaced it, but no.. same problem, like nothing ever changed. i also bought new spark plugs, NGKs v power, thinking they could be the problem, replaced them, and still nothing. i have reset the ECU several times after that, but after a few drives, the codes come back. i think i have like 5 codes that constantly show up. 304, 420, 507, 123, and 223
. i think those are about it. cylinder 4 misfire, o2 sensors( i dont have the spacers yet), unusually high RPMs, mine are about 1050rpms idle., and i dont really remember the other 2. i think one has something to do with my throttle tho... i do the self diagnostic on the car every once in a while, i don't like ppl telling me whats wrong with my car lol
oh one more suuuuper important thing!! when i start my car, white smoke comes out the exhaust. it bothers my like craaazy!!! it never used to do that, till all these codes started showing up. sometimes the smoke is unbareable. its super white, and it stinks like a mixture of gas, and somethin else. i love my car to death guys, i have huge plans for it, but its failing me
i need yalls help. its a 2003 alti 2.5. auto, with 89k miles.
PS: when i went to the stealership, and told the guy i had the head gasket replaced, and had the head cut/machined, he shit a brick, he was surprised my car was running, cuz apparently on a QR motor, u can not have the head cut. he was surprised it ran. i wasnt lol, but thats just a heads up for you guys, maybe im lucky, maybe hes fullashit. it worked out with me, i dont see why it wouldnt work out with anyone else. appreciate the help fellas