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Old 12-13-2015, 02:56 PM   #1 (permalink)
Popester82
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Intermittent glow plug lights

For about a week now I've noticed when I crank the truck the glow plug light will blink once or twice after it has started. I have noticed if I leave the ignition on about 15 seconds longer after the glow plug light goes out before I crank I don't see the light. I have a bad glow plug. Or could it mean I need to wait longer after the glow plug light disappears before I crank it. I didn't really notice that light in the summertime seems to have just started as we've gotten into the colder weather. If this is a global issue is there any way to test which glow plug may be bad. The truck has 145,000 miles on it now I've only had it about 4 months now do not know if they've ever been changed

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Old 12-13-2015, 04:32 PM   #2 (permalink)
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Quote:
Originally Posted by Popester82 View Post
For about a week now I've noticed when I crank the truck the glow plug light will blink once or twice after it has started. I have noticed if I leave the ignition on about 15 seconds longer after the glow plug light goes out before I crank I don't see the light. I have a bad glow plug. Or could it mean I need to wait longer after the glow plug light disappears before I crank it. I didn't really notice that light in the summertime seems to have just started as we've gotten into the colder weather. If this is a global issue is there any way to test which glow plug may be bad. The truck has 145,000 miles on it now I've only had it about 4 months now do not know if they've ever been changed
When you have started your vehicle the Wait to start light will cycle a couple of times while it is running. That is normal..

Colder temps means the ECM has to command the Glows to cycle longer for a proper combustion temp..
If you are experiencing extended cranking to get the engine to start that could be one of the signs of possible bad glow plugs.

One rule of thumb is : If you are unsure of the age of the Glow plugs or Injectors then it is advisable to replace them..

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Last edited by OkDually; 12-13-2015 at 04:33 PM.
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Old 12-13-2015, 04:35 PM   #3 (permalink)
alpacalips
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That is perfectly normal. The glow plug cycle will be longer when the temps are colder and the glow plugs will continue to cycle on and off for a few seconds after the engine is running. Crank the engine as soon as the "wait to start" light turns off the first time, don't wait for it to start blinking.

Edit: I typed too slow, okdually beat me to it

Last edited by alpacalips; 12-13-2015 at 04:36 PM.
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Old 12-13-2015, 05:14 PM   #4 (permalink)
Popester82
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I haven't noticed any issues with it cranking it still fires right up. Maybe I just wasn't paying attention in the glow plug light does blank after it cranks as far as replacing glow plugs is that something someone mechanically inclined can do or should it go to a shop I am by no chance an awesome mechanic. But I can do things but that's just because I was poor and had to learn lol. I know ok dually has answered a lot of my questions but this is my first diesel and only had it since August. I have made sure I became a paid subscriber and I also try and buy from our sponsors just so this page can stay up it has saved me a fortune. I noticed on Leroy diesel there is a glow plug removal tool which I do not have that's why I was curious if it was something that could be tried at home or not seems like the tool was pretty pricey for a hand tool
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Old 12-13-2015, 05:38 PM   #5 (permalink)
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Quote:
Originally Posted by Popester82 View Post
I haven't noticed any issues with it cranking it still fires right up. Maybe I just wasn't paying attention in the glow plug light does blank after it cranks as far as replacing glow plugs is that something someone mechanically inclined can do or should it go to a shop I am by no chance an awesome mechanic. But I can do things but that's just because I was poor and had to learn lol. I know ok dually has answered a lot of my questions but this is my first diesel and only had it since August. I have made sure I became a paid subscriber and I also try and buy from our sponsors just so this page can stay up it has saved me a fortune. I noticed on Leroy diesel there is a glow plug removal tool which I do not have that's why I was curious if it was something that could be tried at home or not seems like the tool was pretty pricey for a hand tool
I did my own glow plug and Glow plug harness replacement and i am not a super mechanic. It can be done. Just take your time and you will get it done.

I first soaked all the threads of the glow plug in PB Blaster to help with removal. I did not buy any special removal tool.
If you research the glow plug threads here some have it listed as to the size of socket you should use. IIRC, I believe it was a 3/8 deep socket..

You will have to remove the right front wheel and inner fender and loosen the turbo downpipe to give you access to the passenger side plugs..

only use Bosch Duratherm: 80034
or ACDelco: 60G Glow Plugs.
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 12-13-2015 at 05:45 PM.
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Old 12-13-2015, 08:28 PM   #6 (permalink)
Freddyack
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Quote:
Originally Posted by Popester82 View Post
For about a week now I've noticed when I crank the truck the glow plug light will blink once or twice after it has started. I have noticed if I leave the ignition on about 15 seconds longer after the glow plug light goes out before I crank I don't see the light.
Waiting 15 seconds after it goes out means the glow plugs have cooled off and so has the air in the pre-cups. So it is harder to start the engine.

Hit the starter as soon as the glow plug light goes out.

As others have posted, the glow plug light blinking after a start is normal with cold temperature starts. It is referred to as "after glow"
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Old 12-13-2015, 09:15 PM   #7 (permalink)
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Thanks guys. Makes me feel alot better. If I were to replace them. Should I use the Bosch ones or the AC Delco. I hear a lot of people preach buying ACDelco only for the 6.5.
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Old 12-13-2015, 09:17 PM   #8 (permalink)
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Quote:
Originally Posted by Popester82 View Post
Thanks guys. Makes me feel alot better. If I were to replace them. Should I use the Bosch ones or the AC Delco. I hear a lot of people preach buying ACDelco only for the 6.5.
Reading the threads, both the Delco and Bosch are equally as good...
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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 12-14-2015, 10:25 AM   #9 (permalink)
JMJNet
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For this part, Bosch is good.
I prefer the Bosch for colder weather although I live in the South.

For OPS, there is no Bosch OPS so you have to use ACDelco and all other things that say sensor, sender.

Bosch also made the injector for this truck which is also rebranded as ACDelco.
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