I recently noticed a puff of smoke when starting my 20v in the morning, so I decided to replace the glow plugs. I was amazed to find out only one plug was working.Yes 4 heater plugs not working, and my 20v 156 with 154K still started quickly with just a puff of smoke.
Now with the new heater plugs the alfa dosent start noticably quicker bur the smoke has gone.
Next winter I will disconnect all 5 glow plugs to see who the Alfa starts.
I dont know how many of my glow plugs were down last winter,and I WONDER ARE GLOW PLUGS REALLY NECESSARY in direct injection engines.
About 12 years ago a pal decided to replace the glow plugs in his montego (2.0 Perkins) sadly he destroyed the head trying to remove 2 of them,he was later told he should have left them alone as they weren't needed.