High rpm backfire through exhaust

[skyboy]

Hi Guys,

Good day, got a quick question , Im experincing back fir or misfire from my exhaust when I rev in high RPM happen quick often , I'm driving a Evo8 MR , need your advice in this before i consult the Mech.. hope you guys can help me...

2. Planing to change my hks to Nur spec Catback .. any comment???

regards
Sky...

 

[Slowboy]

Maybe over rich afr setting...

 

[skyboy]

hmmm how to sort that out any other... suggestion???

 

[flanker c]

1.) a/f rich

2.) spark plug gap

3.) recirculation B.O.V (Vent to atmosphere bad for stock evo) can cause afr rich...

4.) reflash ecu can solve this problem

 

[skyboy]

Thanks Flanker c very infomative ..