dragonrob

I am looking for a 89 928s4 engine harness with the computer plugs if anyone has one they want to sell or if anyone knows where I can find one please let me know .thanks Rob.

Bilal928S4

Ask Roger if he has new / rebuilt ones.

ALKada

^^^^ seek out the Oracle.... Rog100 (928sRus.com) or SeanR. Best wiring harness around.

Don Carter

I believe I have one in decent shape, but need to verify if it's 88 or 89.

dragonrob

I think a 88 will fit 89 maybe some differences?

Don Carter

IMS temp sensor plugs. Do you need those?

dragonrob

I'm not really sure my harness is burnt a the back of the engine from fuel leak.

dragonrob

.
What I'm doing is putting a 89 engine in a 86 car and I'm not fimilar with the 89 wiring I have the computers so I'm going from there.

Don Carter

With an 89 engine in a 86 car, you won't have an IMS system to connect, so you could probably use the 88 wiring harness, and just leave the temp sensors disconnected or remove them and plug the holes. Likewise, you'll have knock sensors on the top of the engine that won't be of any use. I don't know if the 88 harness will plug into the 86 computer and if it will all work, but PM me if you after researching it, you want a picture and price of what I have.

dragonrob

I have the 89 computers ,the 86 plug sare different than the 89 computer plugs.Let me know how much your asking for the harness. rob

dr bob

Rob--

You'll need to connect the knock sensors to your block under the intake, and you'll need the matching EZK and LH boxes from the 1989 car. If you have the 1989 exhauts manifolds, the IMS temp sensors are fitted in those. Get a harness with the IMS relay socket (and relay...) and you can maintain the cat fire protection. Get the diagnositic plug and its bracket along with the rest of the harness, and you can then Sharktune. Handy even for diagnosing sensor faults and other issues too.

ALKada

Your 89 oil pressure sensor is not the same as an 88 (I have an 88 harness on an 89) so you will have to change your pressure sensor.

John Speake

The wiring changes 88-89 due to the change to the digi dash. The position of the diagnostic socket and wiring also changed so this may need sorting.

I would go with the 88 harness if possible for your transplant project. I think it will give less problems to sort out.

Don Carter

I took a look at the harness I have and I don't think its the one you need. The one I have goes through the firewall and connects to the CE panel but not the computers.

Kevin in Atlanta

I have all the harnesses from a 91 GT.