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Old 01-10-2007, 09:35 AM   #1
hybooststi
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Impreza WRX STi random misfires everyday???

hey guys ive been gettin misfire codes in each cylinder constantly.
i clear the codes they come back, just changed the plugs,using ngk' 1 step colder.ihave a 04 sti forged pistons,sz55w/tial44mm ewg,fmic,utec,pe 850's
etc..... the car has mad 456whpand 472torque on a dynojet.
anyways theres not much difference in lack of performence just curious on why im getting this. last time i had a broken ringland ,now i have a new shortblock. we did a compression test and everything read even across the board. might be the power enterprise inj. anyone with expierence wanna chime in ,thanks in advance. i understand these do happen just curious on why so often, something else may be wrong!!!
no blue smoke or black smoke on start up or idle, some white smoke but no smell.
k.c.
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Old 01-10-2007, 10:25 AM   #2
Unabomber
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Do you have a lightweight flywheel?
If so, that might be your answer. If not, it might be your coil packs if the CEL calls out one or two cyls regularly. If so, swap them around to see if the CEL plays follow the coil pack.
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Old 01-10-2007, 02:54 PM   #3
hybooststi
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ah i forgot about that , good one. i did recently put in a exedy twin disc
that comes with its own lightened flywheel. good point and i doubt its the coilpacks but ill try, i do get the same amount of misfires from them all . it just sucks to see the cel and cruise blink but i can deal with it, i was just curious if something i might have over looked or what not. thanks

k.c.
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Old 01-11-2007, 10:40 AM   #4
east milford wrx
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+1 sounds like the fly wheel.
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