Got a 95 VW Golf 1.9d, i've had it for over a year, have problems with starting it when it is very cold, glow plug light will come on then go off after couple of secs, then turn ignition just keeps crankin until the battery goes dead. Have to jump start which will take about a minute of crankin to start (then smoke pours out of exhaust), once started then no problems until left again in cold for long period of time. I've changed glow plugs and now have changed glow plug relay (142), still no joy.

Can anybody help me please????