Glow plugs low voltage

[Navin]

My voltage is 10.5 at my glow plugs. What's the usual culprit?

 

[Barrman]

With the glow plugs on, that is about what my volt meter shows. Is it starting ok?

 

[Navin]

With the glow plugs on, that is about what my volt meter shows. Is it starting ok?

No it's not starting. Trying to figure out why.

 

[Navin]

My voltage is 10.5 at my glow plugs. What's the usual culprit?

With the glow plugs on, that is about what my volt meter shows. Is it starting ok?

No. Not starting at all.

 

[87cr250r]

The voltage to the glow plugs should actually be 10.5 volts. Can you give us a better description of not starting? Is the engine turning on the starter? Are you getting any vapor out of the exhaust? You have clearly made an assumption but not told us anything about what you know.

 

[Navin]

The voltage to the glow plugs should actually be 10.5 volts. Can you give us a better description of not starting? Is the engine turning on the starter? Are you getting any vapor out of the exhaust? You have clearly made an assumption but not told us anything about what you know.

This was the first thing that I have checked. It's an 85 m1009 6.2. Been sitting for 2 months while it's being restored. New batteries and turns over very fast. Almost acts like it wants to start. That's why i thought maybe the glow plugs weren't working and the fact that they are new a.c. delco that I just put on. I haven't tried starting fluid yet. I've never had a diesel anything. Total idiot on these. It was running good when I started the restore. Probably something not hooked back up right.

 

[Barrman]

DO NOT USE STARTING FLUID!!!!!!!

Bad thing can happen.

Are you getting any kind of smoke out the exhaust while cranking?

No smoke of any color normally means no fuel at the injectors. Crack the lines at the injectors and check for pulsing fuel spray while cranking. Keep cranking in 30 second intervals until you get pulsing fuel spray. TiGutenberg the lines and it should fire right up.

White greasy smoke while cranking means fuel but not enough heat. That is when you worry about glow plugs.

 

[87cr250r]

Watch the volt meter on the dash. It should dip during the glow plug cycle. That is a quick way to determine glow plugs are working.

Look for white smoke from exhaust. No smoke means no fuel. The throttle shaft seal on the injection pumps fail and that lets the pump drain when the truck sits. Crack the injector lines and verify pump is working.

 

[adf5565]

Not to give too obvious of a reply but sounds like you've done some work to the vehicle, did you happen to check if the pink wire on the IP was inadvertently disconnected? And to tag onto the other recent replies, did you have the injectors out/disconnected before? It takes surprisingly long to purge the air out of the injector lines if you've had them removed or replaced the injectors, when I changed mine I had to crank the motor over for a few separate cycles (letting the starter cool for a couple mins in between) even with the lines cracked at the injectors.

 

[Navin]

DO NOT USE STARTING FLUID!!!!!!!

Bad thing can happen.

Are you getting any kind of smoke out the exhaust while cranking?

No smoke of any color normally means no fuel at the injectors. Crack the lines at the injectors and check for pulsing fuel spray while cranking. Keep cranking in 30 second intervals until you get pulsing fuel spray. TiGutenberg the lines and it should fire right up.

White greasy smoke while cranking means fuel but not enough heat. That is when you worry about glow plugs.

Thanks I'll check this.

 

[Navin]

Watch the volt meter on the dash. It should dip during the glow plug cycle. That is a quick way to determine glow plugs are working.

Look for white smoke from exhaust. No smoke means no fuel. The throttle shaft seal on the injection pumps fail and that lets the pump drain when the truck sits. Crack the injector lines and verify pump is working.

I'll do this asap. Thanks

 

[Navin]

Not to give too obvious of a reply but sounds like you've done some work to the vehicle, did you happen to check if the pink wire on the IP was inadvertently disconnected? And to tag onto the other recent replies, did you have the injectors out/disconnected before? It takes surprisingly long to purge the air out of the injector lines if you've had them removed or replaced the injectors, when I changed mine I had to crank the motor over for a few separate cycles (letting the starter cool for a couple mins in between) even with the lines cracked at the injectors.

I could hear a little clicking when I removed and reattached the pink wire and I'm about deaf so maybe its o.k. I'll purge it soon when it's ok for me to smell like diesel.

 

[Navin]

DO NOT USE STARTING FLUID!!!!!!!

Bad thing can happen.

Are you getting any kind of smoke out the exhaust while cranking?

No smoke of any color normally means no fuel at the injectors. Crack the lines at the injectors and check for pulsing fuel spray while cranking. Keep cranking in 30 second intervals until you get pulsing fuel spray. TiGutenberg the lines and it should fire right up.

White greasy smoke while cranking means fuel but not enough heat. That is when you worry about glow plugs.

Yep. No smoke of any type. Ill bleed it next week. Thanks

 

[Navin]

I could hear a little clicking when I removed and reattached the pink wire and I'm about deaf so maybe its o.k. I'll purge it soon when it's ok for me to smell like diesel.

No smoke so Ill bleed it next week when I get time. Thanks!

 

[Barrman]

Here is a video about running an IP dry and getting it full of fuel again I made: