Z32 Ignition issues

[g.k101]

Hey guys hoping to get some suggestions here. I am having some sparking issues, as in non at all.
Lets start out at what I have done
got the car, found the head was warped, so put a new set of heads cleaned and decked. Valves, springs, hydraulics, camshafts, the whole nine.
new gaskets, every gasket on the upper end. Also new ground wires, egr delete, AIV delete and new O2 sensors. Also new PTU. CAS confirmed good (was running and getting spark before rebuild). Getting zero spark on any cylinder but no check engine light is on. Any ideas?

[g.k101]

Update: good compression (all cylinder right between 171psi-180psi) Plenty of fuel delivery. all coils tested between .6ohm-1.1ohm. Still trying to figure this out.

[g.k101]

Update #2: getting good (+) and (-) to the coil and the (+) ignition signal seems a bit weak. Getting good current at the PTU in and out.

[nissanfreak12]

Make sure you have all the grounds connected on the back of the plenum, it will create a no spark and possibly even damage the PTU. The one that is normally forgotten is the passenger side. There should be two connected, they are held on by the 10mm bolts.

[g.k101]

I have the rear plenum one connected. I am thinking that I should just try running a second ground just assurance reasons. Under a continuity test I do have the engine grounded (no idea the strength though)

[nissanfreak12]

I think there are 3-4 different grounds for the rear plenum. Just double check all the wiring.

Did you physically check the spark? Is it possible you have #1 on #2 and so one? It is possible, remember #1 cylinder is the first one on the passenger side. I am not calling you dumb or anything, it's an easy mistake, has been made by many "seasoned" motor heads and even highly trained mechanics.

The only other thing is the ECU is toast, that has happened to me as well.

[g.k101]

Yeah I am going to recheck the grounds. I know the one on the lower plenum is connected because it was a PITA to get off and on, aside from the others are left unchecked. And I can verify the connections are correct (used masking tape and tagged each sensor/connector as I pulled them). As far as checking the spark, pulled cylinder 1, made a makeshift bracket so I could see it from the drivers seat, and ran a wire directly from the main ground (that is new wiring) to the spark plug threads. Still nothing. I am hoping the ecu isn't screwed tbh.

[g.k101]

Ok re-ran new grounds. Both rear upper and lower plenum connected and for giggles I ran grounds to the sides of the heads where the old Prvr solenoid and AIV brackets used to be. So super grounded. Finally got codes tonight too, 11, 13, 21. So i took the CAS off and spun it at a low speed, heard a ton of clicking mainly from the injectors. still no spark signal. I am thinking the CAS has half failed (possible?), which would cause code 21 for ignition signal circuit. #13 is coolant temp sensor which I had off that the time of testing once, to verify the ecu was reading all the sensors. gunna try a new CAS maybe? if not i think i am banging my head against the wall.

[nissanfreak12]

Instead of buying a new CAS, do you have someone you can just use to test to see if it works? I would also suspect the PTU if you have no spark. Even though you get a reading, it still could show to low too actually create a spark. I think one of the guys on here did a significant testing of the PTU.

Where do you live at? Before you bang your head against the wall, possibly call Coz or one of his minions at conceptzperformance, talk to them about the ECU and the not sparking. I know every now and then he gets them in and a driver isnt working.

One more thought, check the key inside where the CAS attaches, make sure it is not worn down or missing. It looks like this...

https://conceptzperformance.com/Cart/de ... hp?II=4589

[g.k101]

I did a sway on the PTU. Brand new in plastic still straight from Nissan themselves. I am trying to make the car reliable, which means buy what is needed. The Camshaft side looks good (new camshaft and all), but the CAS side looks like it is on a pretty acute angle. Also I wish I had another person to test the CAS against. My workplace is going to let me test out an ignition coil for giggles.

[g.k101]

So, didnt even think of this till recently. Could the security system cause a no spark condition. If not it might be getting towed to an eletrical shop to figure the rest out.