My engine light came on when i banged on 5th, on my 03 evo i used a diagnose tool to read the code and it was miss firing in multiple, i changed my spark plugs and check my coil packs, my buddy said it could be from a boost leak to etc. but recently the engine light went off and came back on? i mean can it be my tune? or what? help i bet this happened to alot of you... just a little help

 

If you are getting the P0300 code its very common and happens to alot of us.

 

I just read My CEL yesterday and expected to Just see the P0420 (no cat) code, but a P0300 snuck in there. I'm not too worried about it as I've cleard the codes and it hasn't come back with about 100 miles on the car since.

 

Im on my 4th Check engine light first 2 were miss fire & the other a no cat. Im on a CEL now with the same problem 5th gear lag. I bet its just the miss fire again.

 

Just get a creader and live with it. It won't be gone until you rebuild the tranny.
That's what I do.

 

creader didnt do **** for me. its a piece of crap, wouldnt even read my codes

listen, if its the P0300 u are going to have to deal with it. mine comes and goes every 3 weeks or so. its nothing to worry about.

 

Its just going to happen man. I just got cams & had the same code come on twice in 2 weeks. I just clear it, no biggie. I notice no misfire at all myself.

 

wow so s@#t just happens hahaha, damn whew i was going to pay someone to give me a boost leak test and etc.. man X_X so i should just live with it ha dang

 

sorry to be a bother but the engine lights been on now the thing is that seems like a huge lag on 5th gear!?#@ im worried should i be? i mean it drives fine.. tho weathers cold outside so i spool very quick..

 

probably not a boost leak (but you still might have one).

you did plugs, that would be my first guess.

my second guess is a bad tank of gas.

 

clean that out with some stuff my bud give me i forgot whats it call.. filled it up full and put that stuff in damn it i cant think of whats it called. engine cleaner basically. and gas from shell.

 

Is it always the same cyls? Is the plug gaps right?

 

what?


dude you changed your coilpacks and plugs without the car running funny? just for a damn light?

 

0300 can be caused by a list of things. First of all start with the basic crap, what did you gap it to and with what kind of tool?

A boost leak may cause a "too rich" code instead.

 

the gapping tool, all of them gap to spec. 26mm. at first when i didnt gap them my spark plugs would blow out once i hit 20psi of boost, after i gapped it i can go full boost. no problem just 5th gear is a bit of a lag....