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Thanks for the info, does anyone know where i can get a replacement glow plug conrtoller card ( the card under the dash in the balck box) mine has a fried chip on it.

as stated in above posts the ambient temp during the day is around 85F and at night it is only dropping to about 75F (read= hot as hell), i shouldn't need the glow plugs at all at this temp. I am going to try to find the pressure switch and see if replacing it helps, the fliter is stock so i...

I have a manual switch hooked up to the glow plugs, but it doesnt help with the starting problems. I could glow it 5 or 6 cycles and it still wont start any easier( sometimes motor will sound like its trying to start, but wont) Just curious, would starting fluid fire if the starter is not...

Is the pressure switch a military part or is there a GM part # for it? Also does anyone have a spare glow plug controller and the card that goes under the dash?

When i said it had cold starting problems, i meant that after it had been sitiing for about 8 hours, it is hard to start. The temp around here right now is averaging about 85 F during the day and about 75 F at night, I shouldn't need the glow plugs at all to start it when its this hot outside.

My 6.2 is really hard to start cold, I have to spray with wd-40 ( glow plugs are disconnected) to start. after it warms up, it will start on the first crank for several hours. I just finished replacing the lift pump, thought that the problem was a worn out check valve allowing fuel to drain...