Phantomhp

Well,

Bought an 86 NA for my sis a month or two ago.

The wiring harness was spliced together right before it got to the engine. Took the engine apart tonight and noticed a problem.

The Sec. Injectors were the Low Imp Injectors (#195500-1350)

The Prim. Injectors were the High Imp Injectors (#195500-1350)

From what I can tell the Sec. Injectors are part of the 86-87 13B Engines and the Prim. Injectors were part of the 88 13B engines.

Well the ECU and wiring harness coming out of the firewall was what I believe to be the S4 harness but spliced into the S5 harness.

Now, I am pretty sure this would keep the car from starting as you have 2 types of injectors and an ECU ment to run Low imp injectors.

My question now is...do I need to just change out the Sec. Injectors to the High Imp Injectors (have the other 2), change the harness to a full S5 harness and swap the ECU to match the S5 as well?

Any help is greatly appreciated.

Thanks,
Mike

RotaryEvolution

iTrader: (30)

confused since the injector numbers matched and it is easy to notice an S5 harness since it will have to have the S5 alternator with large S5/S6 style plug, a large 6 pin connector for the TPS and a double plug for the electrical OMP.

Phantomhp

That is what I can't figure out.

Like I said the harness is spliced together right before it goes on top of the engine.

The part that goes over the engine and around to the Prim Injectors plugs right into the Square Tops with the offset.

While the section from the splice back to the passenger firewall had spliced in Low Imp injector clips and put in low imp injectors for the second.

It is very confusing but can't figure out which way I need to go lol

From the FAQs the Square Top/offset injectors come out of an 88 which is an S4 still correct or no? so I might be wrong in the original post assuming its S5.

Also the ECU is an N326

Mike

rwdburnout

i have a ECU and wirering harness for sale if you want it its out of a 87 N/A rx7

Phantomhp

I might be needing the harness. Are the injector clips Square with the notch being offset? not centered

I believe from what Icemark said in a previous post that the N326 will work for any NA between 86-88 so I wouldn't need the ECU.

I think in my situation just getting a new harness and putting back the 2 High Imp injectors will be the easiest way.

Mike

Stanello

iTrader: (1)

Does the harness still retain the resistor pack box thing located on the passenger side fenderwell, near where the AFM is? It is a 1in by 3in or so silver box.

Phantomhp

Honestly unsure if there is that little box over there or not. I looked in both areas for problems before taking thins apart and all seemed there as far as plugs go but the previous owner dropped in this engine...spliced the 2 harnesses together, changed the sec. injectors to the Low Imps probably off the old engine then wondered why it wouldn't start.

So I would assume nothing else was moved, changed or removed.

Mike

RETed

Can we all repeat this again...

THE ECU HAS NOTHING TO DO WITH THE FUEL INJECTOR IMPEDENCE...
THE ECU HAS NOTHING TO DO WITH THE FUEL INJECTOR IMPEDENCE...


-Ted

Phantomhp

I didn't say anything about the ECU and imp. in what you quoted. Icemark in a post did say that the ECU would interchange between the 86-88's so I wouldn't need to buy one.

Mike

rwdburnout

the injector clips are Square um just let me pull the motor and ill have some pics do you need the ECU

Phantomhp

The clips are square but the notch on the clip can be in the center or offset to the side.

I need the with the clips that have the offset.

Mike

rwdburnout

can you find a pic for me

Phantomhp

That is the Square Plug/center

I need the Square Plug/offset which means that little tap is off to the side vs. in
the center.

I could probably just get a pair of Low Imp injectors and the Plugs and splice those in where the High Imps were and it would work as well as long as I have that resistor box.

Mike

Phantomhp

Yes, one section of the harness still have the resistor pack connected.

Mike

rwdburnout

those are the same clips my harness has how much would you par for it

Carzy Driver

you could just file off the centering tab, that way you don't have to go through the trouble of rewiring the harness.

HAILERS

The question I have is about the spliced harness. Are you talking three or four wires or are you talking about approx forty wires all being cut and spliced together?

Sorry, but using high impedence injectors in a low impedence car will not cause the engine to not run or even run funny. It will run as normal as apple pie. Dont be changing injectors or plugs.

You NEED to go to the injector plugs with a meter. One of the wires on each connector should have battery voltage. The other wire should have continuity to the ECU small plug.

The number and which wires are spliced makes the problem hard to figure out. The injectors and injector plugs wouldn't bother me at all.

Phantomhp

The entire harness is spliced.

It looks like someone got the engine with harness then realized they still had the original harness so they just cut each harness off and spliced them all together.

There isn't a single wire that isn't spliced and it's not even a good splice. They are just twisted together with no connectors or electrical tape.

Also the engine was running 2 Low Imp Inj. and 2 High Imp Inj.

Mike

HAILERS

The two low, two high wouldn't bother me with a series four and a N326/N327 ECU.

I've spliced all those wires myself on a burnt up series four turbo and had no problems running that car for over a year til I got a stock series four harness.

But, splicing those wires was a lesson. It isn't just splicing green to green, red to red etc. An example is the brown/black wires that are the gnd wires for the various sensors in the engine bay that are all spliced together and terminated at the ECU. There are other examples.

I'd buy me a used stock harness if I were you and install it.

Again, there should be batt voltage at one wire of each injector. The other wire terminates at the small plug of the ECU.

The two ground wires for the electronics inside the ECU are located on the top of the rear rotor housing using a ring terminal. A must have item.

The brown/white are all spliced together inside the harness. They are for the ref voltage for all the sensors. Scrogg that wire and the thing won't work. And on and on.

Phantomhp

Yeah, By the looks they just tried to match colors but they took time to splice in the Injector plugs for the Low IMp injectors as well.

The ground is still there but who knows on all the wires if its right.

I have a harness coming from Indyparts anyways as I was going to replace the harness even if it ran due to the horrible splicing that was done.

Mike