98 Classic Wrx Misfire @ 5000rpm

[GDP1974]

My 98 Classic has developed a misfire/hesitation @ around 5000rpm...

The engine is standard accept for a 3" decat

No Trouble Codes

Any Ideas

[odessey]

Does it only do it when driving?

[Gambit]

tough one with no codes :( Maybe Plugs, Coilpacks, Fuel filter but would think you would have that in low revs also. Have you have the ECU remapped since have the decat put on I would maybe swing with that being the problem :)

[scottishtaffy]

with no codes then i would say coil packs. but firstly i would change the plugs. cant go wrong with iiridium ones. could be fuel starve higher up also. what pump are you running and when was the filter changed?

[Gambit]

Agreed. And I hate that I agree with scottishtaffy he's like my better looking step brother that stole my girlfriend ;)

[scottishtaffy]

:lol: :lol:

[GDP1974]

Problem solved.... I changed the plugs to RB7S and the misfire has gone...

 

THANKS TO ALL THAT REPLIED

[scottishtaffy]

jobs a good un :D

[Jay762]

result!!

[Gambit]

That's what I like some good news :D