tuned ecu now need help

[EMC2]

i have a tuned ecu for 740cc z32 maf gt2871 .64, and cams, anyway my trouble is it pops and sputters when im at low throttle then when wot it pops then revs but revs slow then will back fire and half the time die. timing is set dead on 15 deg also checked for vacuum leaks and boost leaks, ecu throws no codes except 55, the wire off the back of the coil harness when touched to engine or ground will make car run even worse, also the ground was hooked up before tune and car ran well, where does that wire go? any ideas or help would be great. thanks

[rps13drift]

try a different ignitor chip! I recently had very similar issues with my set up and i swapped my ignitor for a different one and it cleared right up. But if thats not the case look into engine/chassis grounds! It sounds like yours are weak anyway

[WoolyS14DET]

Sounds like it could be a engine harness issue ??? If it was fine before and now you mess with that wire then WTF ???? Are you sure it's tuned for a Z32 air flow meter ?? What kind of comp and who tuned it ?? How are the plugs ??

[EMC2]

can you tell me where the wire off the back of the coil pack harness goes? does it go to ground? if so when i hook it up it makes my car run really bad. and gives me maf code not everytime but has. thanks

[EMC2]

i changed plugs already gapped the same as ive always run at 10 psi. (.028)
as far as i know it should be tuned for z32 i just got the tune a few days ago and been fighting it since. it was tuned by e-mance (thought id chance it)

[EMC2]

also i had a bad knock sensor i did not know about til i installed the tune but replaced it with a new one.

[rps13drift]

can you tell me where the wire off the back of the coil pack harness goes? does it go to ground? if so when i hook it up it makes my car run really bad. and gives me maf code not everytime but has. thanks

Yes! The small black wire with the metal circle goes to a ground! I did it at the back of my head but some prefer going to the firewall. Also are all your coilpacks bolted down the the valve cover with the phillips/10mm screws?

[EMC2]

ok thats what i thought thats what i had before and yes all the coil packs are bolted down. when i hook up that wire its runs bad. also if i touch that wire while car is running it shocks me is that normal. it also directly effects the maf. i wired the maf up per frsports recomends thanks for the help this is driving me nuts

[spirit]

I bought a MAF from frsport as well. My guess is you got the wrong MAF tune. You got a tune for a vg30 MAF when you need a tune for a vh41.