Hi, my evo 8 missfire very often! I changed ingnition, spark plug, spark, and the problem is not resolved. Also, I have rough idle and small miss at low rpm...

please help me....

 

Do you have cams.

 

I'm not sure! hahah

I recently bought this car!

But cam can make missfire?

 

are you throwing random misfire codes or just popping alot? what plugs are u using and what are they gapped to?

 

check TP sensor, major imput for your ecu could be throw it off.....scan it, does it look "noisy" ? or have a dead spot?

 

bent vlave

 

I have multiple misfire code.

This is what I put in the car:

Okada plasma coil
Magnecor KV85 cables
BRR8ES sparks

What you mean by check TP sensor?

 

Also I check the compression and everythings is correct! Like new...

 

Check battery voltage and battery terminals, I had a little misfire when I installed my sparktech... turned out the Cdi wasn't getting enough juice.

 

have you put a fuel pump in recently?

 

No fuel pump since I bought the car

 

what spark plug gap are you running?

 

I think it's maybe because of ECU capacitor failure?

 

I'll try a tune in a couple of days! I hope.....

 

Bent Valve or... (dont laugh), you might have a Rocker floating around in your head. This happened to me. Kept getting misfires, yet everything else was working fine! Easy check, take off the valve cover and look for all your rockers. Hope you get it to work.