missfire under boost

[madmilligan]

The other night my evo 4 with 6 engine started to missfire under boost I have bpr8es plugs fitted a month ago. Magnacore leads and coils year old. Ive closed gap to near as no gap and got rid of it but surley this cant be right as they have been good for a month? I regapped to 0.6 mm and missfire returns I'm stumped. Don't wanna fork out for coils if its not that. May go coil per plug using garish coils.

 

[And@fcm]

gap to .55, has the car been remapped? are you sure it's not just boost cut? have you checked for boost leaks

andy

 

[madmilligan]

Its ecu ecu tek mapped gizzmo controller evo 9 turbo 560cc injectors etc . No eml etc. Sounds like a really fast missfire on boost. Does it even at 1 bar usually runs 1.7 bar ok.

 

[evo 6 matty]

i had the same problem lastweek mate coil pack are about 10 months old as were plugs but i was getting a missfire on high boost 1.9 bar change my plugs for ngk iridium 1X heat range 8 and gapped to .55 and its cured it pal.i would start with the plugs as there the cheapest

 

[madmilligan]

Cheers going coil on plug ill try that