hi , i own a evo8
built 2.0 with hks pistons , oliver rods , stock crank , acl bearings
pnp head with springs , retainers , oversized valves and cosworth m2 cams
buschur racing gt37r turbo kit
hks intercooler kit
ams intake manifold
sparktech COP CDI system
AEM EMS
intercooler piping kit
br double pumper
skunk2 thorottle body 68mm

the car was absolutely fine but now it has started to misfire as soon as the boost hits even at 1bar just on the WG spring . checked the ignition system , ok
checked the plugs , ok . injectors checked . compression checked .afr's ok . cant seem to understand the problem . can you please help me . is there a sensor problem or something ? what what things should i check

i changed the thottle body a few days ago to a skunk2 68mm one and when i changed it back to the stock one , the missing lessened quite a lot but it hasnt finished :S confused . please help . why would missing decrease from putting the stock thorottle body back on?

 

well the skunk2 throttle body is a hunk of junk and leaks so that explains that

was it fine before you messed with the throttle body to begin with?

 

it was fine before the double pumper install and the TB . but i dont think it has anyhing to do with the double pumper . now im back on the stock TB but the missing is still there .. its lessened a lot but sill there

 

Probably have a leak somewhere. Double check your work. How long has it been since the plugs were replaced?

 

plugs just changed two times

 

Were you retuned after thre double pumper install?

 

yeah i leaned it out a it started running in the high 10's afr

 

does it missfire only when you hit 1 bar (when you are in the boost ) or even you deceleration ?
could be a vaccum leak

 

it only misfires when you hit full boost . 1 bar 14psi . oherwise its perfectly fine

 

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