I have a 85 528i and you can drive it every where then turn the key off and it won't start for awhile then all of a sudden it starts?? We have replaced everything ECM, control mod, chased power to electrical but no luck! I should say when it won't start it has no fire to the plugs. We have tried all of the common ignition fixes but again no luck! You might drive it 1000 miles or 10 miles and it will do this. Any suggestions would be great!! Thank you!!