glow plug issue? - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 9 (permalink) Old 07-11-2019, 05:07 PM Thread Starter
 
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glow plug issue?

i have 2007 lbz i replaced the glow plugs because a few slowly started going out and replaced them with Ac delco and worked fine for about a week and then all 8 are out again but the truck still starts fine. but im just curious what could be causing the problem or if i just got a bad batch of plugs?
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post #2 of 9 (permalink) Old 07-11-2019, 05:40 PM
 
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Recently saw this issue at my shop, the glow plug control module took a dump on the customer. Maybe the next step before trying more glow plugs which is hard to believe.

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post #3 of 9 (permalink) Old 07-12-2019, 05:14 AM
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Quote:
Originally Posted by Chris Stinson View Post
i have 2007 lbz i replaced the glow plugs because a few slowly started going out and replaced them with Ac delco and worked fine for about a week and then all 8 are out again but the truck still starts fine. but im just curious what could be causing the problem or if i just got a bad batch of plugs?
Did you check the bad one when you removed them? I assume that they just fail open circuit, that is the heater element just burns out opens up. I've got 3 out but reluctant to change them because the LBZ starts fine in winter. My only concern is that if they burn out is there a posibility that material may break off inside.

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06 LBZ white, X Cab, Long Bed, 2WD, raised driver seat, Work Truck nuthin fancy
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post #4 of 9 (permalink) Old 07-12-2019, 05:21 AM
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Usually, when you start seeing GPs drop out, it's after a bad battery event.
Low voltage conditions do them in.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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post #5 of 9 (permalink) Old 07-12-2019, 04:54 PM
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Usually, when you start seeing GPs drop out, it's after a bad battery event.
Low voltage conditions do them in.
what is the reason for that? If voltage is lower they are kept on longer by the controller. The current should be lower unless they are pulse width modulated?

Don - WA5NGP

06 LBZ white, X Cab, Long Bed, 2WD, raised driver seat, Work Truck nuthin fancy

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post #6 of 9 (permalink) Old 07-12-2019, 08:57 PM
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They run on amps, not volts.
Volts deliver the amps...no volts, no amps.

Don't know the technical whys and nots....just noticed a trend in failure comes after a battery event.

2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
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post #7 of 9 (permalink) Old 07-13-2019, 08:06 AM
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Given equal watts, when voltage decreases amperage increases. So that is likely what would cause a glow plug to fail under low voltage conditions.

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post #8 of 9 (permalink) Old 07-17-2019, 06:46 PM
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Low voltage wont push the amps through the hole as needed for glow plugs to work properly. Ass you can see the @$$ hole with the rope is ohms that's resistance (corroded wires, loose connections, yatta, yatta, yatta) you should check the amps with an amp clamp if possible but if not check resistance of each glow plug from stud where the wire goes to body where it screws into the block if they are all the same (I'm not sure what spec is but should be pretty low since it's a heating element) then I would check voltage at each one and if all is good go after the module but make sure it's getting all its powers and grounds too I would hate for you to do all this crap and have a relay that's bad or something hope you figure it out
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post #9 of 9 (permalink) Old 07-17-2019, 08:01 PM
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Not sure if you can zoom in on this it kind of sucks but here is a wiring diagram for an 07 2500hd hopefully I put in right vinyl code for motor
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