Hey Guys, I know this isnt directly a nistune topic....but once we get it running, we will be tuning it with nistune!
I have a mate that has installed a CA18DET ECU, loom, and sensors e.t.c. onto an old Z18ET ( single cam EFI turbo Nissan engine ).
He is using all the CA18 bits, inc injectors coil packs, Ignitor, MAF, CAS e.t.c.
We've tried changing all the sensors around before, then he sent me up the loom (lives in a different city), and I went over every single wire, and tidied the whole thing up for him....so we are now 100% certain the wiring is fine.
The CAS is mounted to where the distributor used to be with a custom bracket.
So far, we have got the engine running on cylinders 1 & 4.
2 & 3 wont spark with engine running ( but he said they do spark a couple of times as the engine starts ).
We have tried swapping coils over, swapping plugs e.t.c., and the problem still stays with cylinders 2 & 3.
any ideas we can try?
PS. There are no error codes from the ECU.
Knock sensor is not attached, we have wired a 1Mohm resistor in place.
I read somewhere that this was OK, but not 100% on that.
Engine running on 2 cylinders....
Moderator: Matt
the best (only) way to properly diagnose this is to get a oscilloscope and probe the wires starting with the ECU
assuming the engine is running off two cylinders monitor the ignition wires whilst running for the other two non-working cylinders directly off the ECU. if you dont see any pulses there then there is potentially a problem with the ECU itself. if you do see pulses then probe at the input to the coil packs
I dont think it would be a problem with the CAS because these either work or dont work. if you dont get the 1 degree or reference signal then there shouldn't be any spark at all
assuming the engine is running off two cylinders monitor the ignition wires whilst running for the other two non-working cylinders directly off the ECU. if you dont see any pulses there then there is potentially a problem with the ECU itself. if you do see pulses then probe at the input to the coil packs
I dont think it would be a problem with the CAS because these either work or dont work. if you dont get the 1 degree or reference signal then there shouldn't be any spark at all
yeah, thats along the lines of what I was thinking.
He has played with an oscilliscope, and I think he said he was not getting any signal from the ECU from the IGN signals for those cylinders.
however, they do fire if you spin the CAS by hand, and also when the engine is cranking, but stop going after it fires up.
He has tried 2 or 3 different ECU's.
He has played with an oscilliscope, and I think he said he was not getting any signal from the ECU from the IGN signals for those cylinders.
however, they do fire if you spin the CAS by hand, and also when the engine is cranking, but stop going after it fires up.
He has tried 2 or 3 different ECU's.
This is a copy of what he wrote on another forum:
Well sorted CAS mounting, made no difference.
When i turn the CAS slowly by hand i get spark, but when i spin it quickly, also by hand, it stops, so........ it is rpm dependent, almost like the ECU or ignitor module aren't able to handle it once the speed becomes faster.
Maybe the next avenue is to replace the Ignitor module and ECU at the same time, which i haven't done yet. Maybe the ignitor module is frying ECU's?