90_300zxTT

just got a 01 ss last week and purchased car with bad motor, also got motor with it with 40k on it, new motor was complete, so i pulled motor and tranny out bottom put a new spec clutch in and longtubes and o/r y pipe, then had to put my old intake on and coil packs, now car is running but has a miss, scanner showed cylinder 1 and 8 misfire, and they are at exact same time, any suggestions??? herd couple different ideas just looking for some advise???

thanks

jim ravencraft

Tuned engine ws-6 formula. I am getting misfire code #6 and #8 using gm tool. I installed ngk plugs also swapped coil pack and wires same problem.
Raw fuel odor at exhaust. Is it possible for injector to cause problem.

crainholio

iTrader: (2)

After the ignition system is ruled out, and if the injectors have significant miles and/or storage time on them, I pull the injectors and send them out for cleaning and flow-testing.

01screaminchickin

iTrader: (3)

my buddies car had misfire on #7, pulled the spark plug (no gap), re-gap plug and installed, no more mis-fire, next day same problem, #7 plug has no gap, we pulled the engine and tore it down the #7 piston was cracked under the wrist pin and pin bore was starting to englarge, i talked to a gm tech he said it was a common problem with LS1 and LS6, nine out of ten times it was a odd cyl. 1, 3, 5, or 7, not saying thats whats wrong, just some info to put out there

98pontiac

recheck the gap on those cylinders while inspecting the plugs. make sure your wires are on tight. Change the coils of cylinders 1 and 8 to a cylinder with no misses. Then you can move on to fuel... Best way is to use a noid light to check injector pulses. OR a 194 light bulb put into the electrical connector to the injector will tell you if it is pulsing. THEN if everything still checks out I would re check your intake you put on...