rydholm11211

iTrader: (1)

Will 1990 Injectors work in a 1986? Thanks.

Terrys87

iTrader: (1)

Here are the different injectors.

rydholm11211

iTrader: (1)

so im guessing they will not work?

Terrys87

iTrader: (1)

I never tried it am guessing they wont work. Might would if you swapped injector harness and maybe ECU but I am not even sure if the harness would connect to the rest of the wiring assemblys.

scope103

I'm 99% sure that the C and E injectors are low-resistance (current drive), and the F injectors are high-resistance (voltage drive). ("Fuel Delivery and Injection Control" at www.autoshop101.com)

Which means you'd need a 1989- ECU to drive the injectors, regardless of the connector.

So the answer to your question is "no."

rydholm11211

iTrader: (1)

so then I should just use the 86 injectors?

scope103

?

Why wouldn't you use the part designed to fit?

rydholm11211

iTrader: (1)

Welll someone put in a 1990 enigne with injectors, and 1990 harness, well I need to go back to a 1986 harness, So Im guessing I will have to use the other injectors, I have 4 injectors from a 1987 truck, that should work with the 1986? Am I right? Thanks.

BamaYota1

Why do you need to go back to a 1986 harness if you have a motor, harness and ecu from a 90 truck? You might as well consider the truck a 90 and repair accordingly. What are we missing?

rydholm11211

iTrader: (1)

The 1990 harness has problems a lot of hoagy splicing like they did not know what they were doing, and The ECU is shot! So I want to go back to a 1986 because all my switches and column switches would hook up. Pretty much a lot of garbage wrong!! It is iritating, and it is a two wheel drive truck a 1986, so I am going to use a 4 wheel dirve 1986 harness?

BamaYota1

I am no expert at all, but it would seem a better idea to get a new ecu and harness from a 90 to match your engine and splice in the parts you need from an 86 harness to make everything else work. No matter what, it will require a custom harness. Have you sat down with a wiring diagram from both and compared the two?

Again, I am no expert at all in this area, as I have never even looked at an 86 efi truck.

rydholm11211

iTrader: (1)

Screw that! I just want the 1986 harness and everything to be as close as orignal!

Co_94_PU

iTrader: (-1)

Wow again er still

Ok so to make your 86 4x4 AT harness work on your 1990 2wd MT, you'll need all the 86 version sensors that have plugs that differ from the 90. You need to make sure all the sensors for an 86 fit in the mounting places on the 90. And you will still have the problem of it's an AT harness/ecm in a MT vehicle, You don't have the solenoid sensors and they can't be faked without a custom engineered addon computer.

Is your 4x4 tranny and transfer case healthy? Someone might correct me but I'm thinking you can run it without a front shaft.

Terrys87

iTrader: (1)

Being two different generations of trucks, I would go with the 86. Even though they share alot of the same components and the wiring is 95% the same, there will be different color wiring. Check the TPS,AFM,clock,Igniter, or several of the other circuits, but the ones I just listed I am sure there is going to be 3 different wire colors and then you will need both diagrams to connect the blue wire to a green wire to make something work for example.

Changing harnesses is not the nightmare that it is let on to be. You will need to pull the dash and ventilation and I like to pull the fenders to make it alittle easier. Here is some info to help on that. https://www.yotatech.com/forums/f199...l#post51778558 Start from the drivers side and work you way over to the passenger side.

Stay with 86, if you go with a different year in the same generation, be prepared to get all if that years wiring,ECU,injectors, but some parts are interchangeable but I dont know which ones. I just do the complete swap when doing something like that,

Here is where to locate the part number on the main harness. Just above the speedometer.