hey guys, i know theres a lot of threads of the p0300, i get the p0300 code, when im im on the highway at about 3-4k rpms, ....i changed the coils, boots, plugs, cam positioning sensor, and still getting it, i have br9eix in there gapped at about .23---someone recomended also changing the plugs to br8es/bpr8es... i wanna know what else is recommended and if anyone can help me with maybe updating/changing the software on the ecu. i have inspection the 21st on june-2010, so if anyone has a tactrix cable or knows how to block the code, pleasssseee help me---thanks guys

 

Resonance in the transmission at highway speed sets it off in a lot of cars. Hopefully someone hooks you up and disables it with a Tatrix for you. If not, unplug your negative battery cable to reset the code right before inspection.

 

Im in NNJ and can disable it for you no problem.

 

i went through this myself, on my 03 all i needed was to upgrade the rom.

hopefully gsrboi can hook you up, GL

 

I can certainly update him to a 0015 rom which was mitsu's final rom update to try and combat the P0300 issue. It may work it may not. If not disabling it is just as easy

 

had the same problem. was a pre-cursor to the front 02 sensor going out. may not be your porblem, but I had the same thing even after switching plugs. gl

 

Get it switched off permanently in the ECU. End of problem.

 

im still running my stock coils from 03 and i use bpr7es gapped at damn near nothing. .021 it helped alot but i think i remember changing out my front o2 also. i get that code once every blue moon. also im in nevada. hope it helps. bring that gap down a lil more with a hotter heat plug

 

via tactrix cable?? or is there another way to crack into it? mine pops up every once in awhile due to cams.

 

tactrix cable and ecuflash to flash the new rom image to the ecu.

 

gsrboi, whats your number? ill take a ride

 

That and ECUFLASH only way to do it.

I suppose you could mail someone your ECU

 

I went with aem standalone lol just because I don't like seeing the check engine light

 

Wow, talk about a waste of money.

 

You need to run the car though a full drive cycle before the inspection station can read your ecu, that usually takes about 30-50miles. You can't just wipe it clean right before you go.