1997 Z3 Runs for a few miles then cuts out

[Brian 23]

My friend has a 1997 Z3 which will run for a few miles then cuts out. Will start and run again then intermittently cuts out. He has had crank shaft cam shaft sensors changed. I know probably could be anything, but I thought that I would ask. 

[Bimmer Owners Club]

First thoughts were cam / crank sensors but unless the new ones are faulty then I would start looking at the fuel system.

If the car has been stood for a while then I would firstly look at changing the fuel filter - rarely changed as its an expensive part and also tucked away under the sill.

Also look at the battery connections and it may also have an SRS power cutout on the positive cable which may also be faulty but be careful testing this as it has an explosive charge

[Brian 23]

Thank you I will get him to look at that.