LFA

I need to replace the engine loom of my 1991 GT.
I found two engine looms to replace mine; one from a 1992 GTS and another one from a 1991 S4. Does anyone know if any of these two looms fit 1991 GT. Also, is there a difference in engine looms of auto and manuals. Thanks for your help.

davek9

They all should be the same for those years and as far as the front loom is concerned, auto and stick are the same.

edit: just noticed ur first post, welcome to the shark tank!

Dave

ROG100

89 to 95 the engine wiring harness is the same.

Rob Edwards

By engine loom do you mean the front-of-engine, jump-post to alternator harness, or the LH fuel injection/TPS/ISV/etc harness.


Either way, I agree that either '91/'92 front-of-engine or LH harness is going to work fine on a '91 GT.

But at the risk of venturing off into uncharted Rogerbox territory, on the LH harness, isn't there a different TPS connection on the 94+ auto GTS for that dynamic kickdown thing, y'know, to make the Rogerbox feel a little, more, oh, 'agile'?


And to really nitpick, PET calls out different LH harness P/N's for '89, 90, 91-94 (up to 92RS8 20051, and 94-95. I'm ASSuming the 89-90 change is the position of the ICM connectors, dunno what the change in '91 was, and I think the '94-95 is the kickdown mod (?)

Just speculating a little.


From the '94 Service Info Tech:

ROG100

Rob - I was referring specifically to the "Engine Wiring Harness" 14 pin/starter/alternator - 928 607 002 17 - currently not available from Porsche.
IIRC the LH Jetronic harness covers the TPS and I am sure that it has a different part number for 94/95. Just checked and it has an engine number split at 20500 but auto/manual are the same.

Rob Edwards

Roger- Gotcha- I wrote this long geeked-out treatise on the LH harness and then realized that the OP was likely talking about the engine wiring harness. Duh.

Per Greg's advice, one can always get the '87-88 engine harness and a two-connector oil pressure sender, in lieu of the NLA '89-95 harness

https://rennlist.com/forums/928-foru...e-harness.html

Dictys

The difference in years between 89 to 95 is the wire colours and the change from 2 pin oil pressure sender to 3 pin sender.

I have previous built front wiring engine harnesses for 89, 90 and 93 models.

ROG100

TPS connector should also be different on the LH harness 94 & 95 - 6 way IIRC

LFA

Thanks guys. I very much appreciate all your help.