I have a 95-96 wrx, it recently started to miss fire so i changed my spark plugs and used, bosche super4s. Ever since changing them the miss fire has got worst its mainley wen the turbo kicks in. Iam new to this and would appreciate sum help thanks!

 

What did you gap the plugs to mate?
I used Denso Platinum plugs, gapped to 0.65 and had no issues at all.

If it's not the plugs, check your coil packs aren't cracked or damaged.
If the misfire has gotten worse since you changed them, might well be incorrectly gapped or a problem with the coilpacks.

 

Check the coil packs as mentioned and also the bosch plugs are best used as paper weights.. really not good in subaru engine.

get some NGK PFR6B in with gap at 0.6mm

 

 

You've got, well should have, 4 coil packs mate. One one each plug, you need to carefully check for cracks under the rubber gaiter thing at the tip of each coil pack.

I've known them to fall to bits when removing the gaiter, hence the need to exercise caution.

You don't mention any mods, decat etc, if so I'd suggest NGK PFR7-B plugs.

 

i have full decat apexi stainless steel pipe, hks filter,hks turbo timer, fuel pressure regulator, sqv dump valve an thats bout it for now unless anybody can tell me wot is worth buying next for more power!

 

i hav a problem like urs mate, did you change the coil pack? didi it work?