Glow plug resistance? - Chevy and GMC Duramax Diesel Forum
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post #1 of 8 (permalink) Old 01-13-2013, 12:16 PM Thread Starter
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Glow plug resistance?

Does anyone know what the resistance in LB7 glow plugs should be? I keep finding different info, some of it says I have a few bad ones, but other info says they're all good.

'01 Silverado ECLB
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post #2 of 8 (permalink) Old 01-14-2013, 05:42 AM Thread Starter
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Why does no one ever respond to glow plug topics? Resistance is an easy one. It's unbelievable that either no one knows, or cares!

'01 Silverado ECLB
Ported fuel rails & intake horn, air box mod, PPE boost valve, FPR shimed, LML dr. side ext. manifold
285/75R16 AT's
New injectors & head gaskets
MUCH MORE TO COME!!
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post #3 of 8 (permalink) Old 01-14-2013, 06:38 AM
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I will help. Glow plug resistance is not hard. There should not be more than 1 ohm of resistance on a Duramax glowplug.


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Caleb
2011 Denali LML
Wehrli Emissions Compliant 475/stock kit, Wehrli Dual CP3 Kit, Merchant Auto Trans, Fass Pump
Tuned by Duramaxtuner

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post #4 of 8 (permalink) Old 01-15-2013, 05:50 AM Thread Starter
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OK, cool! Thank you so much for the reply. Now here are my results, using 3 different ohm meters. Make the decision that much harder.
#1 1.2, 1.1, .7
#2 .8, 1.2, .9
#3 .8, 1.3, .9
#4 .8, 1.1, .8
#5 .8, 1.4, .9
#6 1.0, 1.2, 1.0
#7 .8, 1.2, 1.1
#8 .7, 1.2, 1.1

As you can see, depending which meter I use, all of them could be good, or bad...

'01 Silverado ECLB
Ported fuel rails & intake horn, air box mod, PPE boost valve, FPR shimed, LML dr. side ext. manifold
285/75R16 AT's
New injectors & head gaskets
MUCH MORE TO COME!!
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post #5 of 8 (permalink) Old 01-15-2013, 06:09 AM
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I ohmed a brand new set of lb7 glow plugs just last week.

.002 ohms

05 Dmax/Allison
10.86@133
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post #6 of 8 (permalink) Old 01-15-2013, 07:06 AM
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Quote:
Originally Posted by mike diesel View Post
I ohmed a brand new set of lb7 glow plugs just last week.

.002 ohms
This^ they need replaced. They are right on the edge of being over 1 ohm and like mike said a brand new set is very low.


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Caleb
2011 Denali LML
Wehrli Emissions Compliant 475/stock kit, Wehrli Dual CP3 Kit, Merchant Auto Trans, Fass Pump
Tuned by Duramaxtuner

Sold 7/2015: Twinned 07 LBZ
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post #7 of 8 (permalink) Old 01-20-2013, 01:54 PM Thread Starter
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CONCLUSION!!! I had a friend jump on Mitchell On Demand for me and grab a wiring diagram for me. I verified I had the wires in the right spot, but there are the two wires coming from the harness that go to the intake heater and glow plug terminals. Both mine are tan, but the diagram showed a tan one to the intake heater, and a blue on to the glow plug terminal. I cut back the insulation and one wire was blue, and then was spliced to a tan wire! After switching the locations (cause of course they were wrong) and the issue is fixed! Te glow plugs are good with around 1 ohm of resistance. Just thought I'd let everyone who cares know that its fixed and to give future people with this problem who search some conclusion to read.

'01 Silverado ECLB
Ported fuel rails & intake horn, air box mod, PPE boost valve, FPR shimed, LML dr. side ext. manifold
285/75R16 AT's
New injectors & head gaskets
MUCH MORE TO COME!!
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post #8 of 8 (permalink) Old 01-20-2013, 04:10 PM
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1 ohm is still extremely high on those glow plugs. But i guess if they are working, then no need to replace them till they actually die.

05 Dmax/Allison
10.86@133
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