KA24e swapped into 510, problems with spark

[Cscray94]

So with some recent misfortunes with our L16, we decided to swap a KA24e into our 510 rally car. but with our next rallly only a week away we are a bit pressed for time. We recently bought a 1989 240sx with the ka24e in it. While the motor was still in the 240 we took off all the emissions an other non essential stuff an even had it to a point of having the ecu an harness out sitting on the fender, having the right wires jumped to either ground or power an the car would still start. We then pulled the motor out an put it into our 510, hooked all all the wires back up an everything, tried starting the car it fired an ran for about 15 seconds then died, an now has no spark..We checked he coil, checked the crank sensor all seem to be working fine, we took the ecu out an put it into another nissan pickup with the same motor an the truck started fine, our fuel pumps are all working , just seems that the ecu is not allowing it to spark... The codes on the ecu are 21 an 41, (ignition primary , an air temp) please any help would be greatly appreciated!!

[Wc240]

aces for having the balls to try this with a week to spare. hope you planned for bad s*** to happen. air temp will not couse a no start so you could rule that out. first, sorry i gotta say it, run over your wiring again. make sure you got it right. you may have accidentaly tapped into a wire controlling spark. that code normally insists on a bad pwer transistor, or a problem with the circuit of the P.T. very common to be between the power transistor and the coil. refer to the FSM for the wiring

[Cscray94]

aces for having the balls to try this with a week to spare. hope you planned for bad s*** to happen. air temp will not couse a no start so you could rule that out. first, sorry i gotta say it, run over your wiring again. make sure you got it right. you may have accidentaly tapped into a wire controlling spark. that code normally insists on a bad pwer transistor, or a problem with the circuit of the P.T. very common to be between the power transistor and the coil. refer to the FSM for the wiring

Well we took the dizzy coil an the ecu an put them into a pickup that we have an that started just fine. Also the injectors are not pulsine either. We also ohmed all the wires between the dizzy, coil, ecu an everywhere else an they all seem fine... Any other ideas?!?

Also these arethe wires that we have hooked up from the body connector, f8 an f9,Blk/yellow to ign powerBlk/red to ign power brn to ign powerblk/wht to ign powerbrn from swirl control valve to ign powerblk to groundBlk/ pnk to fuel pump relay

igm power is a constant power with the ignition of the car an does not change when starting..

[Wc240]

sorry i dont have a wiring diagram infront of me. but its obvious that the components themselves are fine so id have to say the next logical thing is the wiring. thats really the only thing else it could be. the injectors id say first check for the power. then trace the ground reference back to the computer. the rest sounds just liked wrong/bad wiring. sorry but thats all i got. mabe try to reference it from the truck your using. good luck

[Cscray94]

sorry i dont have a wiring diagram infront of me. but its obvious that the components themselves are fine so id have to say the next logical thing is the wiring. thats really the only thing else it could be. the injectors id say first check for the power. then trace the ground reference back to the computer. the rest sounds just liked wrong/bad wiring. sorry but thats all i got. mabe try to reference it from the truck your using. good luck

Is there something else that maybe we have misses that inhibits the ecu from sending out , spark/ fuel demands ?

[Wc240]

i was told that if it cant get signal from ckp, it wont fir the injectors, but i cant confirm that

[Cscray94]

i was told that if it cant get signal from ckp, it wont fir the injectors, but i cant confirm that

My thought with that is that when we took the dizzy from the car an put in into he truck the truck wouldn't run either.. we tried 3 different dizzys, an checked for contunity from the CKP back to the ecu an it was fine..

[Cscray94]

So a

My thought with that is that when we took the dizzy from the car an put in into he truck the truck wouldn't run either.. we tried 3 different dizzys, an checked for contunity from the CKP back to the ecu an it was fine..

so bit of an update , if we hook a dizzy up off of the motor an spin it by hand you can hear the injectors pulsing but still no spark..

[seang]

What about the crank reluctor wheel?

[Cscray94]

Wouldn't that effect the injector pulse too?

[Wc240]

problems with the CKP signal will affect spark and fuel

[Cscray94]

So what we ended up doing is taking out a complete harness out of the pickup that we have, an hooking that up the the motor then eliminate wires one by one checking to make sure that the car still starts....

Working so far, car still starts but super time consuming...

thanks all for your ideas an suggestions!!