6.5 turbo diesel hard starting

Turtle n Peeps wrote:

4x4ord wrote:

Turtle n Peeps wrote:
Check the glow plugs one by one. You're going to have several burnt out.

They were all replaced when the new engine was put in as were the injectors and injection pump. The truck behaved like this before replacing the engine as well. It takes excessive cranking as it smokes and struggles .... as soon as it starts you can shut it off and it will instantly restart.

Were they rechecked? New means nothing! If I had a dime for every part that failed out of the box I would be rich. CHECK THEM! Was the wiring to the glow plugs checked? Was the continuity to the GP's checked? Was the timer checked?

If all good, the next I would go after is cranking speed. That could be anything from bad cables to a dragging starter; even a bad new battery.

The next I would go after is a compression check.

All of these things have to be checked one by one. My 93 would start down to about 25 degrees with 3 GP's burnt out. When the 4th one burnt out it would not start.

Another thing to check is the lift pump. Can you hear it running? If not 90% of the time it will be the oil pressure switch. Check that too. More than likely it's not a fuel problem if you see white smoke. It's going to be a heat deal.

To check the glow plugs can I unplug them and measure the resistance to ground? What should it be?

The lift pump does run and pump fuel....I've run a wire directly to the pump bypassing the oil pressure sending unit...It's not real obvious as to whether this helped any or not. .After sitting for a period of time the truck will often fire as soon as you cycle the glow plugs and hit the starter. Usually it doesn't start though. I am guessing that initial firing is from the fuel left in the injection pump.

I'm wondering if there is a check valve anywhere in the fuel supply line? Maybe in the lift pump? There is no sign of fuel leaking on the ground.