dragonrob

Hi I have installed a 89 engine into my 86 and my harness is either 87 or 88 no sensor plugs for exhaust. I have the 89 computers and will use them I don't know if I have to change coding on the coding plugs or are they plug and play .I don't have a manual and confused on the wiring I would appreciate any help Thanks Rob.

Ducman82

ya, i would pick up a set of manuals, and check that all the wiring for the computers will work with the CE panel in the car.... no need to start fires or short out the computers.

BC

s4 wiring harness goes into centers block differently.

Lizard928

Very easy to adapt.

A couple small changes needed to the wiring, but nothing major.

dragonrob

I have the harness hooked up and car won't start so I don't know what to check next. There is a rectangle plug that is not connected to anything on the computer housing I don't know if it is supposed to be I would really appreciate any advice .Rob

Ducman82

pictures would help. how did you wire it? does the fuel pump start with the ignition on? are you getting pressure at the rails? spark?. does it crank?

dragonrob

Here is a photo of the plug and there is a round 3 pin plug i dont know where it goes.the car cranks but is no fuel pressure i am not sure about spark either.i ordered a new pressure regulater as it is leaking at vac inlet.rob<br/><br/>

Ducman82

jump the fuel pump relay and see if it works.

docmirror

Spritz some carb cleaner in the intake while cranking the engine. If it fires, you have ignition and you can jump the fuel pump relay then. I don't know what that 12 pin is but betting it's important.

James Bailey

The real question is WHY WOULD IT WORK ??? as Lizard pointed out needs a "couple small changes to the wiring" . That swap is NOT PLUG AND PLAY....and trying to do it without having wiring diagrams is like driving from California to New York without a map !

Ducman82

^^^ yup.

how did you install the harness? there is some wiring that will need to be changed around, or else you will let the smoke out of the computers.

dragonrob

I have tried to put some fuel in intake and it doesn't fire.I also bypassed the fuel pump relay and it runs but no pressure. I used the 86 front harness and changed the oil pressure switch. I also wired the sensors on motor.the main thing I am not sure of is the coding plugs I just plugged them in without changing anything on them .no smoke so far but don't know if there right. Any help is greatly appreciated thanks Rob

soontobered84

That 12 pin should be for the IMS.

The 3 pin round plug looks like the O2 sensor plug

soontobered84

Insanity with good intentions.

Lizard928

There was a connector at the fuse panel with a green and white wire,
The white needs to go to green and green to white when using an 87-95 harness in a 85/86 car.

Do you have spark or fuel pulses?