these are the things i need help with. just some odds and ends.


























thanks for the help guys

picture two thats a ground and it can go anywhere on the frame, but make sure its contacting METAL, and not PAINT

thats all i know haha

dude just get a new coil or something dont use that old pos, there not expensive at all and you dont want to trouble shoot later

also be careful with your vacum lines running close to the fan,

when you think your done, zip tie and clip them away from moving pieces

wow dude your Single cam is all messed up but I'll do my best with what i know seeing as how i am currently in the process of putting my head back on mine i'll just take a few looks at shit that correspond to mine I won't have everything in this comment but check back in a day or 2 when it's not raining on my end so I can go out and check my car for the rest of the wiring.


Ok intake manifold the large vacume tube toward the rear of your upper manifold tank in the shape of an "L" thats for your brake booster.
The Vacume tube on the front of your upper manifold goes to a gas/egr vacume canister located in the S13 you can cap that off it doesn't do anything.
i gotta go right now i'll respond back when i can.

thanks for the better pics man!



First circle- T shaped connection. Alternator connection. Find the KA alternator, get a plug that plugs into the KA alternator. You will need to remove the T shaped plug and splice in (solder) the KA alternator plug (which is oval). When you get the SOHC KA alternator plug, take a pic of it and put it up, I'll tell ya what exactly to do, its real easy.
Second circle- beneath the first- rectangular plug- goes on the transmission, IIRC its the plug for the neutral safety switch, which is on your trans, pretty much regardless of year or trans type- they all used the same sensor.
Third circle-far right, lower- is this part of KA harness or S12 harness? Is this part of the harness that goes to the trans? Is this the same connector thats in the second to last pic that I'm asking the same questions of?



You got it chief, ground that bitch out, but make sure to clean the metal to bare before installing so its a clean connection. Then, paint over or cover with liquid electrical tape, to prevent corrosion.
The other circled plug, the 4 pin circle connector, is for the cruise control actuator, which your car doesn't have apparently. all cars, regardless of cruise or not, have this plug, its just not used.



This is SO close up dude, its hard to see. Back out a bit and reshoot, noting which of these pics you are reshooting. I'm thinking, just because of the colors and apparent location, that these are for the AC compressor and power steering pressure switch, but I could be totally wrong, so zoom out a bit and post that up as well.




This should plug into the KA engine harness???... thats how the DOHC model is set up anyhow....




These are your old coils. Forgive my stupidity about the sohc model, but the coil might be in the distributor on this ka, but I need to do more research. IF the coil IS in the KA distributor, you can remove the stock CA20 coils from the car.




I'll let the other KA guys handle this, I think one of them said it was for the brake booster.





Engine grounds, connect them to wherever screw/bolt they rest by naturally, AND CLEAN the surfaces they connect to! you really want good connections on these, as this is where the ECU grounds thru, all engine functions more or less ground thru these two screws.
The circled connector in the pic there,... looks like it would go to the distributor in the front, IE same style connector. Does it reach comfortably? Or is it right near the idle control motor assembly, any familiar connectors there?





Same circled connector as before pic, correct?
One is your fuel sending line, one is the fuel return line. You have one of the fuel lines hooked up. MAKE sure the the fuel line coming out of the filter is hooked to the lead that goes to all the injectors. Make sure the lead that comes out of the bottom of the fuel pressure regulator goes to the return line, the one w/o the filter. If you are unsure which of the lines in the car is the fuel filter line, the fuel sending line, turn the pump on and see which one has gas coming out of it. be careful tho, lol
The large line is *probably* a heater core line. I'll wait for a sohc ka guy on that one.




That looks like one of the engine connectors.

Dunno if you've figured this out, but the engine harness maintains its shape after so many years, IE it forms to fit. At a certain point, you should be able to just set it on top of the motor, and all the connectors will line up *about* where they actually connect onto the motor. The plastic hardens from heat and age, and things just set up the way they sit, so you should be able to use this to help you. A service manual would help too...





Thats the lower connector that is circled in the first pic, right? its on the pass side strut tower, next to the fuel filter, apparently? Is this part of the KA harness or S12 harness?




Looks like one of the coil wires???


You know, I'm actually kind of wondering... You do have the KA ECU harness, right? I mean, if thats the CA20 harness, its NOT going to work with the KA. I wasn't sure if you were aware of this or not, and we'd go in circles if it was the CA20 harness, lol

Dude, do me a favor too and tell me about your car. Notch, right? Fully loaded, or bare bones, somewhere in between? Rain sensing wiper system? Auto or manual? This info will help with ID some of the chassis connectors. I've spent too much time doing this, lol

yeah i have the ka harness, its not in the pics.

the wires you are looking at in all the pics, are coming from the firewall on the right side(looking at the car head on).

on the coil: it looks like either one of those plugs would go to the center, but there is one already there so i guess i can remove??

the pic with the gold canister in it, is showing where a hose goes, its kinda under the engine on the right side.


*Thats the lower connector that is circled in the first pic, right? its on the pass side strut tower, next to the fuel filter, apparently? Is this part of the KA harness or S12 harness?
thats attached to the cylander, and its coming from the firewall.

the one that goes on the trans....i am using the stock ca trans, i wasnt shure if you meant the s13 trans used same connect or not??




i have an 84 notch, dont know about the rain sensors as car was not running when i bought it, engine locked up on the guy, and i knew i was gonna swap so i didnt really worry about it. power everything and digital dash and that.

In terms of the coils, what you need to ask yourself is how does the KA fire its coil. Does the coil connect to the KA engine harness? Did the coil connect to the S13 chassis harness, as it did in the S12? I think its part of the S13 KA engine harness, but I've seen very few, so I'm not 100% sure.

If you hooked up the coil wire to the distributor, without having a particular way to control the coils (IE connection to the ECU) they won't do anything. I would assume the sohc KA has a transistor and coil connection, and assembly that the later S12s and the turbo models had. These connectors would probably be on the S13 KA engine harness, at the end with the distributor. In this case, you'll need the S13 transistor and coil assembly (they are mounted together usually) and you'll hook the coil wire to that, and you won't need any of the original S12 stuff in the pics.

Is the KA harness installed in the car? It needs to be for all this work. You need it there to know what connects to what on the engine. The CA20 engine harness needs to go, go ahead and remove it. You don't need to connect it up to the chassis yet (you'll probably need my help on the wiring, I'm ready when you are at that point). You can just lay the part that goes on the engine on the engine and just leave the remainder on the windshield.



what exactly are you speaking of here? which of my questions did it involve, lol



stock or S13, I don't believe it will ever matter, seeing as all the ones I've encountered are the same in regards to those wires/connections. so find the plugs that match on the trans, and hook'm up

OK, on the 'cylinder', does your car have a digital dash? If so, it might be the unit for the speedometer, but its been a hella long time since I've seen this setup, so I'm not sure....

QUOTE
the wires you are looking at in all the pics, are coming from the firewall on the right side(looking at the car head on).

what exactly are you speaking of here? which of my questions did it involve, lol
^
Thats the lower connector that is circled in the first pic, right? its on the pass side strut tower, next to the fuel filter, apparently? Is this part of the KA harness or S12 harness?

i think i get what you are saying, that whole wiring harness minus the one with the battery terminals can go?

all the wires you are looking at were from the s12.

sorry abut the cylander thing, this keyboard doesnt like to register my keystrokes(i dropped it on cement lol).

so most of the engine itself i now know how to hook up, some of the hose location just kinda threw me off. in error i kinda lumped everything together, i think to make it easier we will treat it as two different units, engine and electronics.
so in retrospect once i put in the ka harness all the electronics will become a lot more clear(i suppose).
there are some more parts on the ka that are not attached that i am not familiar with but they were in one of the pics in the other thread i posted, but i have no clue where they go. for sake of this thread we can say this is my first rodeo.





those are the other bits i was talking about.
i do know what the ecu is. starter as well. rusty looking in the pic but its just dust,dunno what from, but it wiped off suprisingly the ca starter fits the ka housing flushly in the mounting place but one is much larger than the other.

ummm, yeah....

so all the pics of the harnesses are S12. cool. Definitely go ahead and pull out the CA20 engine harness (the drivers side fender needs to come off in order to do this) and lay on the KA harness. It will make sense where things go. The CA20 engine harness will be of no use to you, so any pics and descriptions above that involve the ca20 harness ignore. When the KA harness is on, you'll have much more come together for ya.

the first part of your last post is kinda confusing, try and get the quote thing down. you can either use the button with replies in quotes, or what I do when there are bits only that I want to quote, just do this

[quote..] copy and paste what text you want in here [.../quote]

(don't put the periods in, I had to do that otherwise it would display as a quote )

you won't see the [quote..] and [../quote] in the post, because thats what converts it to the little box. it would make the discussion a bit more clear.

Take more pics of the last connector there by the fuel filter, I'm pretty sure being you said it was digidash that its the sending unit for the speedometer. Coming out of the trans, there should be a cable that runs to the speedo unit, which digitalizes the signal and sends it to the digital dash computer. Normally, the rest of us with manual speedometers have the same cable coming out of the trans but its longer and goes all the way up to the dash, into the back of the guages. more pics will make this clearer. I would assume the connector for it is on the same harness as what goes to the transmission and alternator. Don't forget you'll need to grab the plug off of a sohc KA alternator.

In your pic,

the things of real importance here (besides computer&starter) are the MAF and coil assembly that I was talking about. The coil pack assembly with transistor is right above the starter and the maf is sitting right above that. The rest of the hoses I'm not going to get into much detail on, because part of that is for the pulsed air injection (shoots fresh air into the exhaust to help catalytic converter work) and part of that is the regular KA intake system, of which I'm not too familiar with, so you'll have to reference KA guys/FSM/junkyard cars.

give me a few mins, and I'll whip up something that will help here.

just some info I found. hella hard to find engine bay shots of sohc KAs

here's a HUGE shot of KA24DE. Scroll around, notice how the wiring lays overtop of the motor, and heads over towards the side where the MAF and (likely underneath of it, below the cone filter out of view) the coil assembly.




Heres an ACTUAL pic of your motor in an S13


see the coil mounted on the strut tower and the wire leading to it? something linke that is what needs to be done. I don't know if your KA ECU harness will go all the way there, but install it, and you'll find out.

those pics helped much. thanks sterling. ill be starting again tomm(today) when the snow clears. silvia love probably has the best pics as he went with KaE as well, but he never answerd the pm i sent. his thread is where i got most of my reference pics. but like i said it was confusing cause in one pic the top two pulleys on the engine(front) were gone,and then another they were there(was wondering if i needed them).

so where do you guys mount your ecu's?? ive read that ppl are playing with different locations??

Ah, figured you'd get to that.

When I did the ka install in Jason's car, I put the harness thru a widened-out version of the hole where the A/C drain hose would be (his is a non-ac car from factory). Let me find some pics.

On the S13 and later, Nissan finally saw the light, and as opposed to running the harness all over the engine bay, down to the front corner by the headlight, and then back up in the fender to the driver's footwell area, they simply put the ECU on the other side of the firewall, ran the harness thru the firewall on the intake side, up and over the intake manifold, and thats it. Much simpler, much shorter- about 6 feet shorter, by my estimates.

So I would recommend that you do the same. Find some place to route the harness thru the firewall (unfortunately, this would have been easier to do before the motor was in the car) and place the ECU on the other side. There is a place, look down on the pass side dash, where the dash extends down and the HVAC unit is tucked up higher. This space, the difference in height in the car, so to speak, is about the perfect height of the ECU and has plenty of space to put the extra wiring. Unfortunately, I never had the opportunity to actually do this to arro's car, ran out of time, but it could be done.

On Henry's car (asparagus) he had no HVAC system at all, and he did a similar thing but placed the ECU in a modified glove box. plenty of possibilities. let me find some pics of Jason's routing thru the firewall...

On the pulleys, thats a mechanical aspect I've not worked with on this engine, so I'm not sure, but it would be fairly easy to tell if you needed them depending on what they did (ie waterpump? power steering? ac? etc)

This is part of the mechanical end of the KA swap that I've been needing to document yet, this thread is helping to focus what will be needed in that regard.

So note that location, you could be anywhere in there, but down low like that clears the heating/cooling equipment. Henry just put his thru one of those larger holes that are blanked off to the left, but you have ductwork there, so no bueno. The size is due to the rubber grommet on the S14 KA harness that I installed, you might not need to go this large, but I wanted to use the grommet for OEM type sealing. Otherwise a smaller hole+silicone does the job.

Realize tho, that you're like SHIT! all the EFI harness connections are on the other side of the engine bay... what am I gonna do?? well, its only like 6 wires, so all I did with these guys swaps is make a small subharness with a couple of wires loomed together stretching from one side of the engine bay to the other, and tucking it up with the chassis harness thats already there clipped to the underside of the radiator support. The KA harness' interface between the engine harness (EFI) and the chassis harness occurs right where the battery is on an S13 and on an S12 if you lay the harness out, you'll see- so its just a matter of running some wires between the two. pretty simple, imo

Some guys will try and stick the S13 ECU where the stock S12 ecu was, but the harness isn't really quite long enough to accomidate this comfortably, so unless you put a hole in the fenderwell and run it thru there (not really the greatest idea imo) you'll be kinda short. I would personally find a way to run it thru the passenger side firewall, and tuck the ecu there.

Just a suggestion for people on the last point sterling made, you could easily mount the ECU above the time control unit on the passenger side kick panel, pretty much the same location as the factory, but on the passenger side, instead of driver side.

sterling you da man.

np man



Dude, REALLY? thats awesome, I'll have to check it out. Thats EXACTLY where the OEM S13 location is, IIRC, or really close. The harness is long enough, anyhow. curious, it may be possible to use the S13 ECU bracket in this spot with the S12, that would be hella tight. there's alot of connectors there tho, so dunno abouts on the space. I personally have plenty of room either way haha

sorry about my last post i don't go on here too often


This is a coolant line that runs to the Heater core on the s13.





moving counter clockwise thats another coolant line that runs throw the s13 heater core, the "L" shaped vacume line thats for the Brake booster, and the Fuel rail lines the top is the presure side, the lower line is your return (the part that runs directly to your fuel pressure regulator.)

sorry I coudn't help you with the sensors but most of mine aren't hooked up i don't have any EGR and i've rerouted all of my vacume lines so I know where those go. The beauty of the early 1988 made 240SX's no check engine light lol.


mod edit: Timeslip, did I do this correctly? does this refect what you were explaining?
-Sterling

what are you trying to say timeslip, i cant make heads or tails of it????

when you want to quote a particular pic in a thread, you can do one of two things.

1. click "Reply underneath the particular post that has the pic you want to comment on, and delete all the pics/words that you don't need to reference to, and then post up whatever you've got to say.

2. right click on the pic you want to address, highlight and click on 'Copy Image Location', and put that in your regular response, which is the -AddReply- button at the bottom of the thread, vs the "Reply button at the bottom of each post. Use the little picture-of-a-tree icon to put in the pic you copied the location of in your response.

hopefully that makes things clearer
and shortens up the posts

I'll edit timeslip's posts, I see what he was trying to do, if you can verify I did this correctly timeslip, please do so, thanks!

just a thought

instead of running a jumper harness

why not depin the connector (6 wires you need)

and pull them through the body harness

and then put the plug on the pass side


after you get it running; cut it to fit.

if anythin runs to the relays just extend them

yeah, some guys have done that, its just a matter of preference.