Recommissioning a Z3 roadster automatic - 4 cylinder, P reg Its been standing since 2010 without a battery, so knew it would take some effort to get it started! New battery fitted, remote 2 button key operates central locking etc fine and all expected lights operate ok. Minimum amount of alloy cover oxidisation in the engine bay shows that it has been kept nice and dry. Operate starter - starter kicks but doesn't turn the engine over. Jump start with another battery connected with heavy leads to earth direct on engine mount bracket and positive terminal in engine bay in case there is any earth strap corrosion problems. Same behaviour. Take spark plugs out to remove compression load, and turn the engine over fine with a spanner on the bottom crank pulley. Try starter again with no load. It kicks (cooling fan just starts turning) and then starter motor stops. Checked volts at engine under starter load and they sink slightly as starter tries and then rise as it apparently gets disconnected. The motion of the starter motor suggests that this is not jammed. Is this an immobiliser problem stopping the starter? Does it disable the starter solenoid but not immediately? Normally I would have expected the behaviour to either have no starter activity at all, or starter spins but ignition is shut off if the immobiliser was active. I have checked previous posts, and normally these are related to erratic restart problems. I have an OBD port diagnostic - I believe that Z3's have an in cabin 16 pin OBD port as well as the under bonnet 20 pin connector. is this right? Probably far too early to worry about the niceties of error codes!