reditr

Hi guys ... i have slight problem in all of a sudden .. when i reach 8000rpm-8800rpm at top gear the car starts misfiring.
Very strange that i can notice, is that it does it only on 4 gear at does rpm..
I cannot understand why it does it only on that gear..
Can anybody give me a hint on what is happening PLS...
Thanks in advance!

racinskittle

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reditr &raquo;</TD></TR><TR><TD CLASS="quote">Hi guys ... i have slight problem in all of a sudden .. when i reach 8000rpm-8800rpm at top gear the car starts misfiring.
Very strange that i can notice, is that it does it only on 4 gear at does rpm..
I cannot understand why it does it only on that gear..
Can anybody give me a hint on what is happening PLS...
Thanks in advance! </TD></TR></TABLE>

LMAO It's called a rev limiter.

PrecisionH23a

What are your gaps on your plugs set at?

Make sure they are set to about .028-.030. If they are any wider then the boost is probably blowing the spark out under heavy load (high rpms).

Ri5e

Do you have MSD?

vtec.dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reditr &raquo;</TD></TR><TR><TD CLASS="quote">Hi guys ... i have slight problem in all of a sudden .. when i reach 8000rpm-8800rpm at top gear the car starts misfiring.
Very strange that i can notice, is that it does it only on 4 gear at does rpm..
I cannot understand why it does it only on that gear..
Can anybody give me a hint on what is happening PLS...
Thanks in advance! </TD></TR></TABLE>

can you be a bit more specific regarding rpm? while you shouldn't hit rev limiter at 8K, you should hit one at 8.5K.. also, tachometer is often inaccurate

Muckman

iTrader: (2)

What kind of spark plugs and gap?

nsxmatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reditr &raquo;</TD></TR><TR><TD CLASS="quote">Hi guys ... i have slight problem in all of a sudden .. when i reach 8000rpm-8800rpm at top gear the car starts misfiring.
Very strange that i can notice, is that it does it only on 4 gear at does rpm..
I cannot understand why it does it only on that gear..
Can anybody give me a hint on what is happening PLS...
Thanks in advance! </TD></TR></TABLE>

If your running stock valvetrain and running past 8500 rpm, a slight misfire will be the least of your worries before long. But like was said before, check your plug gap first.

Chris F

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reditr &raquo;</TD></TR><TR><TD CLASS="quote">Hi guys ... i have slight problem in all of a sudden .. when i reach 8000rpm-8800rpm at top gear the car starts misfiring.
Very strange that i can notice, is that it does it only on 4 gear at does rpm..
I cannot understand why it does it only on that gear..
Can anybody give me a hint on what is happening PLS...
Thanks in advance! </TD></TR></TABLE>

I had a similar problem with e-manage, running too rich. What's your fuel management? A/F? The stock ITR ECU was running me at 90+ injector duty cycle above 7800 RPM.

Definitely check plugs first.

reditr

I am running the stock ecu inline pump and a 12.1 a/f ratio @ 0.55bar..
i tested the car on a dyno a few months ago and everything was working perfect.
This happened in all of a sudden!
But i will check my plugs first.. try and a have ago from there ...
Thanks guys for your help..