Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: korte22 on 19 October 2025, 17:31:54
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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?
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If you can read a wiring diagram, the diagrams in Haynes cover the 2.5td.
Randomly joining wires because the Internet tells you too is unlikely to end well.
It's possible that the engine ecu needs reprogramming to tell it that it's a manual now. The idle fueling is probably set to alow for the extra drag of the torque converter and gearbox pump. Should be a box tick with Tech 2.
And use the diagrams to cross check what you've altered :y