E36 99 Wont Start

[xxXxx]

Had the car back from having a small bit of paint done at the weekend, engine was stinking so decided to give it a good clean, whilst engine was running. After I had finished gave it a good spray with gt85 and left it running whilst I washed the rest of the car. Went to put it in the garage to polish and it cut out and won't restart. The engine is cranking but won't fire, called the breakdown company out and they could not connect to the computer and suggested it's an imobaliser fault. I cant here the fuel pump when I turn on the ignition, dash lights are on as normal. I have plugged in my C110 scanner and it will read the imobalizer no faults but won't read the DME, any ideas as to what it may be or what I can check next