Hi I have just joined this forum. I wonder does any one know why my glow plug lamp comes back on after I have started my engine. It also sounds really lumpy too. this has just started to happen. The agents say it needs a NEW fuel injection pump and number 1 glow plug but it starts first time as soon as I turn the key and runs as sweet as a nut when the glow plug switches its self off after 90ish seconds.