hard starting?

[95suburb]

I have an h1 motor in my 95 suburban that has been running great for the past 5,000 miles. The other day I went to start it and it didnt start. It just kept cranking. I remembered the truck shut off a few weeks back when i tried to bleed the fuel system so i figured it was the lift pump. I changed the lift pump, ops switch, and relay, and still no start. Then i changed the glow plug relay (glow plugs are new as well), and i sprayed the filter with some starting fluid and it cranked right up. Now, the truck stays running when i open up the bleed valve to get the sediment and air out of the system and the glow plugs work as they should. But anytime the truck is cold it will just crank untill i spray it with starting fluid. Any idea whats wrong? thinking its a combustion problem, dealing with my glow plugs??


95 TD suburban, h1 motor, new injectors, lift pump/ops, glow plugs/relay, 180,000 miles

[Chevylover]

Have you check the little plugs which you push on the glow plugs ? Tight ?
If you remove them while glowplug changing, they are often a bit loose after remounting -> no good contact, no enough glowing, not enough heat, no or bad starting.

Cu,
Sven

[frankc]

Chevylovers right not only the terminals at the glow plugs,but also every terminal from the relay to the plugs. Remember this is only 12 volts so it doesn't take much corrosion or oxidation to affect it. When you get it clean put die-electric grease on the terminals and assemble. This stuff works great on low voltage applications. Even if a volt meter tells you at the plugs there's 12 volts,when under a load it's going to break down.