1999 BMW 323 won’t go in gear

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car wont go in gear,neither reverse .smell comes out when engine on

Automatic?
Manual trans?
Odometer mileage?

And… Can you describe the smell?

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With no additional information, I would bet $1 that it is a manual and the clutch is shot.

If I am correct, on a 20-year-old car, if it has typical miles for its age, it would be prudent to replace the dual-mass flywheel and the rear main seal while the clutch is out.

If it is a manual transmission, see if it will go into gear when the engine is shut off, if so, that indicates that the clutch is not disengaging, which can be caused by a failed throwout bearing or chunks of clutch facing floating around between the plates.

Oh, and they used a nylon clutch fork pivot pin. That nylon part can mash down with time so that the clutch won’t disengage. That is a $10 part but several hours of labor so you replace everything while you are in there.

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