Zmego1985

iTrader: (1)

I need someones help i have a engine cylinder misfire i dont know why. Someone please tell me why this could be happening. Also i have headers on my car will nissan void my warranty now?

Thanks Glen

j's350z

Do you feel the engine misfire or just have a P300 code on your engine light... I am 99% sure you just have the code with no misfire. These computers are very sensitive to mods and thats most likely what it is from. Do a search on here to reset your light and see if you get it again....
Jason
MRC Motorsports
www.racemrc.com

Zmego1985

iTrader: (1)

No the engine is running fine autozone shut off the light and its not back on. But they said its saying its misfiring and it was the P300 code and i saw it. So i have nothing to worry about? Also is it still safe to get a technosquare reflash now.

Thank you Glen

PhoenixINX

Interesting... We have ONLY seen this code on cam'd cars.

Might want to get yours into the dealer. Doesn't sound good.

Zmego1985

iTrader: (1)

I reset the ecu and it hasnt come on since. Its been over 150 miles and the spark plugs are perfect, and i dont feel a misfire.

Glen

PhoenixINX

Interesting.

Zmego1985

iTrader: (1)

Im heavily modified now i think this is why it went on. I have a apexi cold air intake, unorthrodox racing pulley, HKS grounding kit, crawford plenum, crawford cats, crawford headers, and Injen ses exhaust. Next mod to get is my ecu reflashed from technosquare so i can get the max performance.

Glen

Jason@Performance

iTrader: (11)

I get it all the time and I have no cams......

every time the fuel cut off is hit, well not every time but every other time, it will throw a multi cylinder misfire...

redls1

I have also thrown this code and have no cams!

luanda

I had the NISMO Headers and the CEL has never come on. Did you hit the engine cut-off leading up to the P300???

If you did maybe that's it and you'll be fine. Maybe that's just wishful thinking. Have you recently dyno'ed? Checked your A/F Ratio??

redls1

Actually mine came on when my kinetix intake was leaking.

Zmego1985

iTrader: (1)

It has not come on since. Im gonna be dynoing and i will get my AF ratio to send to technosquare. So i can get a perfect setup for the crawford package.

Glen

Jason@Performance

iTrader: (11)

anyone who has ever hit their rev limiter they would get this code...

PhoenixINX

Bang it all the time and never had this code.

MIAPLAYA

iTrader: (3)

Never had this code either. Hit rev limiter twice. Interestingly enough I did get it frequently on my Spec V after I installed the header. Sometimes my car would run rough and throw the code.

chazzg

iTrader: (1)

Ok I don't want to Scare you, but here is my Experience with this. I had a clicking noise when my Z was at idle, and I was getting a misfire code (p0306 # 2 misfire) to make a long story shorter, after months of trying different things I found that there was Oil on my #2 spark plug. So I replaced it hoping that would fix the misfire. At the same time Nissan did a compression test and found that my # 2 was at 90 where the others where at 120 (which is where they are supposed to be) so I was down about 30% on my #2.(and still put down 250 on the dyno a week before)

Nissan thought it might be fuel wash out, so I drove the car for a few more weeks to see of it got better or worse. It got worse and the CEL came back on (same Code).I took it back to the dealership. Nissan did another compression test. It was Down about 40% this time. So Nissan thought I had a bad ring, so at this point they did a top down tear down on my engine and ordered new rings and new pistons.

Now here comes the scary part, When they pulled the engine to put in the new parts they found out that the # 2 rod was bent as well. This started a warranty issue, but that has been resolved now. My was in the shop for over 6 weeks.

If you have any questions PM me

Zmego1985

iTrader: (1)

I took out my plugs their all clean and the light has not come on since hopefully im good to go.

Thanks Glen