One or more glow plugs not working would certainly cause smoke and
rough running immediately after startup from cold but I don't think it
would account for a lot of smoke when under load. That sounds like
something else needs looking at.

Stuart
http://www.stuartdalby.co.uk/306.htm

--- In stuartspeugeot306club@..., "xvwannabe"
<xvwannabe@...> wrote:
>
> Hi all,i have just joined the group and wondered if anyone can help
> with a small question please?I am trying to find the peugeot part or
> stock number for the bosch 0 250 201 039 glow plug.I think mine need
> replacing as it is sometimes hard to start from cold & it feels like
> it's not firing on all 4 cylinders plus under load i'm getting a heck
> of lot of black smoke.
>