so i ordered 1 step colder plugs for my boosted tc as it was misfiring like hell on stock. i gapped the new plugs to .038 and it still misfires....but only on full boost. it used to misfire at like 5 or 6 psi with stock plugs that i gapped to .038, then i tried .030 so i just said screw it and got new plugs....its only a misfire on cyl 1 so i checked the 550 injectors and they are fine i even swapped cyl 1 and 2 injectors around to see if it was a faulty injector...nothing....maybe time for a new fuel pump? (im still on the stock fuel pump) my afr's in full boost are around 10.5( i know thats rich but i havent had time to tune due to the rain)...do you think im gettin to much fuel? or do i need to tighten up the gap? they are bkr7's...i noticed they came pregapped at .028 but i would assume that was a little tight....but then again you know what they say about assuming. any help would be great...oh compression is 173-178 on all 4 btw and im running 8psi boost.

 

also i swapped coil packs around to make sure they were fine

 

sound like your motor is ok you just need to tune the car . leave the spark plugs gap at .028 get your AFR up to 11.5-11.7at WOT.

 

Definitley close up the gap to .028 and get it tuned. The problem is you have them gapped too high right now, so the boost blows out the spark. But the other problem is when you close them up, you are running rich, so you may foul them out...

 

why is this in the xA/xB section of the forums???

 

i had to gap my plugs at .020 on my boosted eg hatch to get it to stop doing that!