no spark to #1 or 4 cylinders
 

Hi,I'm new to the forum,hopefully I can get a few answers here because I can't figure it out.I have a 91' 3000gt SL.I have replaced the spark plug wires,the ignition coils,the ECU,and the crankshaft sensor and I still have no spark to the #1 and 4 cylinders.I was wondering if anyone else has had this problem or can think of anything else it might be.Any advice would be much appreciated

RE: no spark to #1 or 4 cylinders
 

I'm sorry but i don't know how to fix that problem... but if you go to 3si.org, search through and ask some questions... It gets much more traffic than in here.

RE: no spark to #1 or 4 cylinders
 

I tried to become a member there but they won't take any free email address'(hotmail).I guess I'll just wait around here until someone with the infinate wisdom of the 3000gt electrical system comes along:D cause I've got a migrane trying to figure this one out.Thanks though.If anything,can anyone with a manual tell me what else I could replace(besides what I've already done)that has anything to do with the spark to the cylinders?Thanks

RE: no spark to #1 or 4 cylinders
 

Replace or check out the PTU. It is the little black unit under the coil packs. It interprets the signals from the ECU to fire the coils.

Instructions

RE: no spark to #1 or 4 cylinders
 

Just ordered a new PTU.I think this might fix it.Thanks for the advice stealth.I'll let you know the outcome as soon as it arrives.maybe it'll keep someone down the line from spending $700 trying to fix the same problem.

RE: no spark to #1 or 4 cylinders
 

No problem, I hope it works. Per the wiring diagram, the only thing left that could be bad is a faulty wire in the wiring harness/connector. Those are a pain to trace out...;)