need help! p0300 code and rough idle
#1
need help! p0300 code and rough idle
I have a 06 evo9 60k. I've tried searching about the code and found some ppl have problems with aftermarket injectors and incorrect gapped plugs causing it but my car has new plugs gapped at .022 and stock injectors and cams as far as I know. I bought this car wrecked and rebuilt it, just got to drive it for the first time few days ago and this is my first evo. The car idles like it has a set of cams and throws the code at idle, it idles up at around 1500rpm when you start it up and only drops to about 950-1000rpm when at operating temp. It drives fine and pulls smooth on acceleration with no noticeable misfire. I've reset the code and it comes right back on.
Mods are
Greedy full exhaust
Forge bov
Forge mbc
Aftermarket clutch
Injen intake and cold piping
Big fmic
Solid mounts
Turbo timer
Aluminum radiator
Not sure if it means anything but it has a piggyback clip on one of the coilpack wires on the driver side, like its had a tuner or monitor wired up at one time. And some sort of small box wired what looks like to the rear o2 sensor that's under the pass seat. Not sure if it has anything to do with my cel.
Mods are
Greedy full exhaust
Forge bov
Forge mbc
Aftermarket clutch
Injen intake and cold piping
Big fmic
Solid mounts
Turbo timer
Aluminum radiator
Not sure if it means anything but it has a piggyback clip on one of the coilpack wires on the driver side, like its had a tuner or monitor wired up at one time. And some sort of small box wired what looks like to the rear o2 sensor that's under the pass seat. Not sure if it has anything to do with my cel.
Last edited by wekpcle123; Dec 25, 2011 at 08:26 PM.
#7
Evolved Member
iTrader: (30)
It drives fine and pulls smooth on acceleration with no noticeable misfire.
Mods are
Greedy full exhaust
Forge bov
Forge mbc
Aftermarket clutch
Injen intake and cold piping
Big fmic
Solid mounts
Turbo timer
Aluminum radiator
Not sure if it means anything but it has a piggyback clip on one of the coilpack wires on the driver side, like its had a tuner or monitor wired up at one time. And some sort of small box wired what looks like to the rear o2 sensor that's under the pass seat. Not sure if it has anything to do with my cel.
Mods are
Greedy full exhaust
Forge bov
Forge mbc
Aftermarket clutch
Injen intake and cold piping
Big fmic
Solid mounts
Turbo timer
Aluminum radiator
Not sure if it means anything but it has a piggyback clip on one of the coilpack wires on the driver side, like its had a tuner or monitor wired up at one time. And some sort of small box wired what looks like to the rear o2 sensor that's under the pass seat. Not sure if it has anything to do with my cel.
Aaron
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#10
Checked all vaccum lines and all good, coils seem to be working fine and I cleaned the maf and throttlebody and still no change, it idles at 1200rpm and has like a slight miss. I can idle the car up to about 3000 rpm and no miss.
Could someone have changed timing and idle rpm with a handheld because the car doesn't have a tuner on it.
Could someone have changed timing and idle rpm with a handheld because the car doesn't have a tuner on it.
#11
Update: after I did the things stated above the car does not throw the code as quick, I have started it and drove 15miles last night stop and go but still idle at 1100-1200rpm, got in it this morning and started it but car didn't want to idle guessing because of being cold, but after it warmed up it idled back up to 1100-1200rpm and after driving for a few min. It threw the code again.
#15
Mine keeps coming up with that code aswell, usually a couple times per tank of fuel.
But since I just got a 2.3l rebuild with new injectors, my tuner said its fine because it's still running in, as long as it's a multiple misfire and not a single one.
I get my last tune for the rebuild next month, so hopefully don't get it anymore after that.
I'll let you know how mine goes.
But since I just got a 2.3l rebuild with new injectors, my tuner said its fine because it's still running in, as long as it's a multiple misfire and not a single one.
I get my last tune for the rebuild next month, so hopefully don't get it anymore after that.
I'll let you know how mine goes.