Dead cylinder #4

[dr.klawn]

S13 SR Blacktop---came to a stop last friday & the engine began to rough idle. got to the jobsite & white smoke started dumping out. ALL FUEL!! i realized i was running without my #4 cylinder. checked codes & got CAS & MAF. checked MAF 1st, it's fine(unplugged it & it affected motor & then hooked back up & it revs well above 4k). unplugged #4 injector, it was firing, so it was fine. unplugged #4 coil pack, no change in anything!! reset codes & ran motor & no more codes but still running without #4. did a compression test(cold ass motor idky i didnt warm it 1st) 130psi across all 4 cylinders. per FSM checked all & anything with ignition system with a volt & ohm meter & was showing + at my coil pack plugs on the harness. got another 4 coil packs from a buddy & still nothing on #4. unplugged my ECU & ignitor chip & installed in my friends s13 blacktop & it drove like a champ. ordered another CAS even though that code is no longer there but that didn't fix it. so now i'm down to wiring. i've been searching like crazy on here but not finding any results.....i'm lost & my brain is becoming fried...i let someone else build my harness back in '07 & haven't been happy with it so now i'm really beginning to wonder. so?????????????????????

:wackit::rl:

[dr.klawn]

well..... to answer my own ? kinda....thanx to sum local guys. lower o-ring on the injector. repaired & prrrrrrrrrrrrrrrrrr!! well after driving down the road a couple miles, only on decel did it begin to pop or backfire 1 or 3 x's.... drove it around for a lil while longer, & the same results. it's not poppin like crazy just when it wants 2.:nono:

[spools420a]

whens the last time you did a boost leak down test?I ask this cause that would have located a leaky injector o ring before it got too serious and the misfire kinda sounds like what happened to me when i tore my coupler only it started to misfire more in the higher rpms it seemed,Anyways good luck.