Hi . Thanks in advance for reading. I've got a 1995 subaru impreza wrx import . Basically it has an intermittent misfire .I'm hoping it's a coil but would like some input . For quire a while now when it's damp out for the first 5 mins of driving it has a slight misfire . I no which coil it is as I can hear it arching out but this clears once warmed up. Now it has a intermittent miss fire when under boost . It only started when I fitted a front mount intercooler so not sure if I has anything to do with this but it did start at the same time . I'm thinking maybe the coil is weak and the slight increase from the front mount intercooler being fitted is showing this . Hope all this makes sense.
Cheers Jon

 

Sounds like a coilpack breaking down.

 

Did you get it mapped for the fmic?
Maybe it's det you can hear?

 

That's what I'm thinking.
No its not been mapped yet but will be getting done . Im sure it's not detonating though
Cheers jon

 

Increasing airflow in due to removing the standard airbox,and fitting a fmic so running lean!
Have you checked AFR's? Do you have a knock detector or some detcans?
If you're sure your car isn't detting then fair enough

 

Sorry forgot to say it didn't have standard air box mate. Already has an aftermarket filter on . Not checked AFR's yet but will being getting this checked in the week. No dont have either of those mate . I am pretty sure it isn't Detting but I will get it checked just to be 100% sure . Thanks for the replies

 

if the missfire cant be cured by regaping plugs to 0.65mm then its a air leak post maf or your cambelt is a 1/2 tooth out. this happens when the cambelt is changed without clamping the passenger side cam pulleys