I agree with the "3 prong" approach, I had problems with an '83 300TD Turbo a few times. Had fuel gel in the lines after sitting unstarted half the winter and had to bleed the lines at the injectors untill I had flow to each cylinder, Had to do a battery recharge once in the process. The other time the plastic primer pump had a hairline crack that developed after a fuel filters change with probably a little to vigorious amount of priming and it wouldn't start.
--- In diesel_mercedes@yahoogroups.com, Lawrence Rhodes <primobassoon@...> wrote:
>
> After testing all the glow plugs in the 83 240D and installing a new glow plug
> relay 12v is flowing to all glow plugs now but starting function is still not
> there. Much cranking is needed. I have started this car in sub 40 degree
> weather after overnight cooling on vegetable oil using no throttle and getting a
> smooth idle. Is it possible for a glow plug to test good but not function
> sufficently to warm the chamber fooling the relay into glowing the dash light?
> In the past when more than one glow plug was bad the relay won't kick in. Still
> starting hard at 40 degrees. Shouldn't a battery sag test work to see if the
> glow plugs are drawing current? If so what is the battery sag when all four
> plugs are drawing current? Can a functioning glow plug not function because of
> dirt covering them in the chamber? Any other way a glow will not function but
> test good? Lawrence Rhodes....
>
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