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Full Version: Having some swap wiring issues w/ '84 CA20
Club-S12.org > Engine Specific Forums > KA24E/DE Tech
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David B
yea the fuel pump is hard wired, i was told that my ignition is probally off timing, and ill get on that tomorrow.

also ill check for spark, but the car didnt pop UNTIL i wired it up, before when i cranked it never popped


its like, a REALLY loud pop, im damn sure im getting spark now regardless



at the moment right now i have the MAF taped to a elbow that comes out of the intake, is that alright? haha
silvia love
the maf has to be a min of 18 inches away from the throttle body. the tape should be a temp fix but dont keep it like that. when i did the engine swap on a focus, we didnt have the right intake assem, so we taped the old engines one on and it worked great for that day! haha

the engine shouldnt really pop that loud, i had open header and it popped but nothing crazy. well it should start if you got everything wired in now, try hitting it with a little starting fluid thru the brake booster vac line...... the fuel pumps wired up, so are you getting fuel to the engine?

oh and you dont need to hardwire the pump, i dont like that idea unless its a track only car. i figured out how to get it wired like it is in a s13. my pump comes on for about 5 seconds then turns itself off. just like it was suppose to. i however had to add a new relay for it to work like that. for some reason when i wired it like sterling did in his write up, my relay switched over as soon as i connected the batt. cables. not good. would've drained my batt. so there was no switched side, i think it was getting constant power. meh, it works so thats all that matters, with the computer being the ground controlled switch.
David B
hmm ell it mainly is a track car i dont mind the hard wired ness
cs357sig
QUOTE(silvia love @ Feb 14 2009, 12:55 PM) *

i however had to add a new relay for it to work like that. for some reason when i wired it like sterling did in his write up, my relay switched over as soon as i connected the batt. cables. not good. would've drained my batt. so there was no switched side, i think it was getting constant power. meh, it works so thats all that matters, with the computer being the ground controlled switch.


I found that when I wired up my pump with a scavenged relay from the s13, that the diagram on the top of the relay didn't match the labels on the inside when the plugs for it were removed. That may have been your problem. Lesson being, check for continuity between wires coming out of the relay itself before hooking it up...just to be safe.
silvia love
QUOTE(cs357sig @ Feb 15 2009, 12:11 AM) *

I found that when I wired up my pump with a scavenged relay from the s13, that the diagram on the top of the relay didn't match the labels on the inside when the plugs for it were removed. That may have been your problem. Lesson being, check for continuity between wires coming out of the relay itself before hooking it up...just to be safe.

i know the diagram on the relay isnt matched to the wires. i had my wires numbered 1,2,3,5. knowing which pin was what and where it went. i meant that the wires sterling had must have been backwards or something cause at first it was hardwired even though i followed his s13 wiring set-up. the pump stayed on without the key in the car. id connect the batt, turn the key over, the pump would then turn on. id remove the key and it would stay on still. im gonna have to unwrap my harness to take a few pics how i got mine to work.
off the top of my head i think it goes like this....i'll verify this later.
i have power coming in on acc or start to pins 1,5 on the relay. pin 3 black.yellow wire goes to the ecu then the pump(black/red wire on my car)and pin 2 black/pink wire goes directly to the ecu.then i grounded the sheilded wire in the engine bay.
cs357sig
QUOTE(silvia love @ Feb 14 2009, 04:27 PM) *

i know the diagram on the relay isnt matched to the wires. i had my wires numbered 1,2,3,5. knowing which pin was what and where it went. i meant that the wires sterling had must have been backwards or something cause at first it was hardwired even though i followed his s13 wiring set-up. the pump stayed on without the key in the car. id connect the batt, turn the key over, the pump would then turn on. id remove the key and it would stay on still. im gonna have to unwrap my harness to take a few pics how i got mine to work.
off the top of my head i think it goes like this....i'll verify this later.
i have power coming in on acc or start to pins 1,5 on the relay. pin 3 black.yellow wire goes to the ecu then the pump(black/red wire on my car)and pin 2 black/pink wire goes directly to the ecu.then i grounded the sheilded wire in the engine bay.


My bad, I didn't mean for that to sound like I thought you couldn't figure out a relay. It was more for everybody else's benefit to avoid disaster. The only reason I figured that out was because I had checked for the aforementioned continuity out of curiosity.
As far as the wiring went, I did wire my stuff up (ecu and fuel pump) per Sterling's write up word for word and it fired right up and ran like a champ.
200sxkitcar
if you used the old fuel pump writeup, there may have been problems. I edited it a few weeks ago.

all the wire colors and pictures are there, if you're not quite sure where the connectors are on the S13 harness, I can take a more zoomed-out pic, but it shouldn't be too hard to find. the S12 connectors are usu. white/light tan underneath the airbox where the CA20 engine harness used to connect to, so those shouldn't be too hard to find either...

ask more questions if you need to....
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