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1

Omega Electrical and Audio Help / Re: Rough start and high idle M51

« on: 24 October 2025, 20:54:52 »

Thank you for these anwsers.

That pin24 is shown as straight to ground if manual and if automatic it comes with signal? from auto control unit. So im sure that is good.
Now I have to find Tech2 with Opel/Vauxhall software card somewhere.

I have second Omega 2002 with 2.2 gasoline engine. With "My Naff Code Reader" you can just select from menu what gearbox it has. I tough that was same with M51 but it doesnt give that option at all.

2

Omega Electrical and Audio Help / Rough start and high idle M51

« on: 19 October 2025, 17:31:54 »

Hello.
I have 2000 Omega B2 with BMW's M51 diesel engine. This car was originally automatic but that transmission broke. I swapped manual tranmission but now car has high idle and rough start.
Before transswap it had normal idle and great starts even in cold weather. I did solder two thick wires from autotrans loom together so now it starts. I have read this forum because someone had similar issues after manual swapping but none of these have helped me. https://www.omegaowners.com/forum/index.php?topic=97236.msg1218947#msg1218947 That pin 24 they talked about here had no effect after grounding it. There was talk about some other pins but I have no idea what those are. Mechanically car works great but that idle and rough start is terrible.
Engine codes with "My Naff Code Reader" gave wrong engine speed and I changed flywheel sensor to new high quality one. This had no effect either and it still gives that code.
Does anyone know that wires is should join together or what should i do?