bmw mechanics

[lady jane]

my bmw 325 is still running when you turn the key off and pull it out, and battery lead off, please help thanks

[dannywells]

dodgy ignition switch would be my first check.

if you are asking how do you stop the car in that case, well you would have to pull the spark plug leads, depending on which engine you have depends on how you would do this, the early engines are easy to do, but the 24 valve the leads are well hidden
make sure you use a dry rag to insulate ur hand

[chadad]

If you disconnect your battery while the engine is running, then you chance ruining the alternator.
Does the engine continue running for only a short time ?
If so then it is pre-ignition. caused by glowing carbon deposits. and you may need a de-coke.
chadad

[lady jane]

it keeps on running till you stall it .

[woodchopper]

Is it a diesel by any chance ?

[lady jane]

no its petrol

[derekpara]

When did you last have an oil change ? If your engine oil is contaminated with petrol ( short journeys, plenty of choke) it could be continuing the ignition (self-igniting) as oil etc is drawn past the piston rings into the combustion chamber.

Just a suggestion, but I have of this before.