KA-t no injector pulse - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ISpoolOldSchool · 06-02-2013, 03:02 PM

Whats up everyone? I recently picked up a s13 shell, a ka24de, and some turbo parts. The car was a 90 sohc auto car, now its got a 92 ka in it, with 550cc injectors, a z32 maf, enthalpy tuned ecu, top mounted turbo, intake butterflys are deleted ect ect. I drove the car that the ka, trans, and wiring harness came from, I also drove the car the ecu and turbo setup came from. all within 2 weeks before the guy started taking stuff apart.

I traded a car for everything, received a rolling shell and a truck bed full of parts. After a night of work, I got everything in the car, and fired it up, it ran super smooth for about 15 seconds, but I noticed a spew of oil coming from the oil filter housing so I shut it off. I replaced the housing with another one, in the process took the intake loose to get that top bolt (it wasn't really completely together anyway) and now that im reassembled, ive got no injector pulse. has fuel pressure, spark, and a good starter

So heres some of the troubleshooting ive done:

Checked continuity between ecu injector ground outputs and injector wiring, found no problems. All 4 injectors have solid battery power. I can ground the one pin and hear them click open and closed

Checked power and ground to ecu. I cant remember the exact pins, but I followed the fsm twice and everything came out fine. Ive never saw the ecu led light up, and it looks like the screw in the side is set to self diagnose, Ive never moved it. I grounded the wire from the DOHC body harness plug as well.

heres what confused me. I removed the dizzy with it still plugged in, spun it and heard no injectors. I did meter pin c when I was turning it and saw it hit 5v. Plus im getting spark, I figured it wouldn't spark if the CAS wasn't working.

If I unplug the CAS, the fuel pump runs. It runs and primes when you first turn the key on like it should, it seems like the cas resets it or something.

I have a maybe 8 gauge ground in the lower harness going to the block, one coming out near the injectors to the intake manifold, one on the exhaust side of the head, and one that's an uncovered strap with a connector, connecting to a tab on the firewall. does that sound correct as far as grounds go?

heres one by the injectors, what Is the sensor with the yellow ziptie around it? looks like coolant temp but I thought that's what the red connector was for

I feel like its a grounding issue, but I cant find a ground to blame it on.

Theres some wires loose in the lower harness im not sure of, one is orange, and the other appears to be a tiny ground wire patched into the middle of my heavy ground in the lower harness.

sorry to write a book, ill probably add even more later. Im just looking for some other thoughts.

Thanks, Mark

Frank_Jaeger · 06-02-2013, 08:28 PM

Your grounds sound fine going off of memory. Do you have the ECU bolted down?

The sensor with the ziptie is one of the coolant temp sensors. It goes to the cluster for the temp gauge. The red sensor next to it is also a coolant temp sensor that's used by the ECU.

Are the injectors high impedance or low impedance?

ISpoolOldSchool · 06-02-2013, 08:32 PM

Its not, should it be?

I honestly don't know. Ill contact the previous owner. They're 550cc and purple.

Frank_Jaeger · 06-02-2013, 10:40 PM

Quote:

Originally Posted by ISpoolOldSchool

Its not, should it be?

I honestly don't know. Ill contact the previous owner. They're 550cc and purple.

I'm pretty sure that'll do it. At the least ground the ECU to the chassis, but I would bolt it in to the stock location.

They're probably high impedance, but check if you can.

ISpoolOldSchool · 06-03-2013, 10:43 AM

Bolted the ecu, no dice.

It seems like its just not pulsing when I crank it. I pulled the dizzy again to double check the timing, I do hear injectors when i spin it, put it back in and it hit until it ran out of residual gas

ISpoolOldSchool · 06-03-2013, 11:17 AM

Any idea what this orange wire and black wire in the lower harness does? I've since moved the heavy ground wire from the chassis to the intake.

ISpoolOldSchool · 06-03-2013, 02:40 PM

Also I have a heavy gauge 2 pin plug left over. The car doesnt turn over by key, the po had a button start rigged at one point I believe. Something has to be missing. One wire is black/yellow (goes to the starter solenoid) and the other is black/white (comes from ignition switch?). I believe theres an identical plug I have that is connected that's wired black/yellow and white.

06-02-2013, 03:02 PM	#1
ISpoolOldSchool Join Date: May 2013 Location: Charleston, WV Age: 30 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	KA-t no injector pulse Whats up everyone? I recently picked up a s13 shell, a ka24de, and some turbo parts. The car was a 90 sohc auto car, now its got a 92 ka in it, with 550cc injectors, a z32 maf, enthalpy tuned ecu, top mounted turbo, intake butterflys are deleted ect ect. I drove the car that the ka, trans, and wiring harness came from, I also drove the car the ecu and turbo setup came from. all within 2 weeks before the guy started taking stuff apart. I traded a car for everything, received a rolling shell and a truck bed full of parts. After a night of work, I got everything in the car, and fired it up, it ran super smooth for about 15 seconds, but I noticed a spew of oil coming from the oil filter housing so I shut it off. I replaced the housing with another one, in the process took the intake loose to get that top bolt (it wasn't really completely together anyway) and now that im reassembled, ive got no injector pulse. has fuel pressure, spark, and a good starter So heres some of the troubleshooting ive done: Checked continuity between ecu injector ground outputs and injector wiring, found no problems. All 4 injectors have solid battery power. I can ground the one pin and hear them click open and closed Checked power and ground to ecu. I cant remember the exact pins, but I followed the fsm twice and everything came out fine. Ive never saw the ecu led light up, and it looks like the screw in the side is set to self diagnose, Ive never moved it. I grounded the wire from the DOHC body harness plug as well. heres what confused me. I removed the dizzy with it still plugged in, spun it and heard no injectors. I did meter pin c when I was turning it and saw it hit 5v. Plus im getting spark, I figured it wouldn't spark if the CAS wasn't working. If I unplug the CAS, the fuel pump runs. It runs and primes when you first turn the key on like it should, it seems like the cas resets it or something. I have a maybe 8 gauge ground in the lower harness going to the block, one coming out near the injectors to the intake manifold, one on the exhaust side of the head, and one that's an uncovered strap with a connector, connecting to a tab on the firewall. does that sound correct as far as grounds go? heres one by the injectors, what Is the sensor with the yellow ziptie around it? looks like coolant temp but I thought that's what the red connector was for I feel like its a grounding issue, but I cant find a ground to blame it on. Theres some wires loose in the lower harness im not sure of, one is orange, and the other appears to be a tiny ground wire patched into the middle of my heavy ground in the lower harness. sorry to write a book, ill probably add even more later. Im just looking for some other thoughts. Thanks, Mark

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06-02-2013, 08:28 PM	#2
Frank_Jaeger Zilvia FREAK! Join Date: Jan 2012 Location: Port Charlotte, Florida Age: 29 Posts: 1,352 Trader Rating: (1) Feedback Score: 1 reviews	Your grounds sound fine going off of memory. Do you have the ECU bolted down? The sensor with the ziptie is one of the coolant temp sensors. It goes to the cluster for the temp gauge. The red sensor next to it is also a coolant temp sensor that's used by the ECU. Are the injectors high impedance or low impedance?

06-02-2013, 08:32 PM	#3
ISpoolOldSchool Join Date: May 2013 Location: Charleston, WV Age: 30 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Its not, should it be? I honestly don't know. Ill contact the previous owner. They're 550cc and purple.

06-03-2013, 10:43 AM	#5
ISpoolOldSchool Join Date: May 2013 Location: Charleston, WV Age: 30 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Bolted the ecu, no dice. It seems like its just not pulsing when I crank it. I pulled the dizzy again to double check the timing, I do hear injectors when i spin it, put it back in and it hit until it ran out of residual gas

06-03-2013, 11:17 AM	#6
ISpoolOldSchool Join Date: May 2013 Location: Charleston, WV Age: 30 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Any idea what this orange wire and black wire in the lower harness does? I've since moved the heavy ground wire from the chassis to the intake.

06-03-2013, 02:40 PM	#7
ISpoolOldSchool Join Date: May 2013 Location: Charleston, WV Age: 30 Posts: 10 Trader Rating: (0) Feedback Score: 0 reviews	Also I have a heavy gauge 2 pin plug left over. The car doesnt turn over by key, the po had a button start rigged at one point I believe. Something has to be missing. One wire is black/yellow (goes to the starter solenoid) and the other is black/white (comes from ignition switch?). I believe theres an identical plug I have that is connected that's wired black/yellow and white.