nowboostinII

my mods are all bolt ons, e85, tune, 28psi,evo 9

my plugs seem to misfire under boost, but its a recuring problem because ive gone through 2 sets of used plugs, and now i just installed brand new oem ones but its doing it again.

when i change them they always work fine untill ive done a few pulls then they start misfiring again

the used sets were gapped to .022 but i didnt do anything to the oem ones

like i said they work fine for a while but then it starts again, and logging shows its not knock, and whenever i switch plugs it pulls fine

i thought brand new ones would last longer than a few pulls too but they didnt

is there anything that could be causing this recurring issue?

caLi4G63

iTrader: (40)

What type of plug are you using? I've had good success with NGK copper plugs gapped to .022-0.24 Have you looked at your ignition cables from you coil packs? Make sure they are not old and grounding on your valve cover. Lastly, do you have an ignition amplifier? I have an HKS DLi and it's worked great at higher boost levels.

nowboostinII

ignition amplifier sounds interesting but damn expensive...im using the oem platinum iridium 7...how can i tell if my coil packs are grounding? i doubt they are old my car has 19k on the clock

Veronica@TTP

iTrader: (4)

You sure you're using evo 9 plugs and not evo 8 plugs? Seems this occurs rather frequently. Good luck though!

nowboostinII

yea im sure i had to pay $50 for the oem evo 9 plugs....the 8 guys are lucky and can get colder bpr's for cheap cheap