glow plug reading. Is this normal?
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Senior User
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From: the nutmeg state "CT"
glow plug reading. Is this normal?
I have the equus 3320 The Equus Innova 3320 digital multimeter
and am by no means an expert. hence the link to the directions so you can tell me I'm a dope if I am using this thing incorrectly.
I pulled the plugs on the VCs and got this
DS
1.4
1.4
0.L
0.L
0.L
0.L
1.4
1.4
PS
1.4
1.4
0.L
0.L
0.L
0.L
1.4
0.L
Now I assume the 0.L means that the circuit is bad so my last GP on PSide seems to need replacing. But that would also mean all the circuits between are bad too. Am I using this thing right?
and am by no means an expert. hence the link to the directions so you can tell me I'm a dope if I am using this thing incorrectly.
I pulled the plugs on the VCs and got this
DS
1.4
1.4
0.L
0.L
0.L
0.L
1.4
1.4
PS
1.4
1.4
0.L
0.L
0.L
0.L
1.4
0.L
Now I assume the 0.L means that the circuit is bad so my last GP on PSide seems to need replacing. But that would also mean all the circuits between are bad too. Am I using this thing right?
Cargo Master
Joined: Oct 2010
Posts: 2,089
Likes: 16
Thats not enough terminals. Should be 9. Check glow plugs term to ground. Check injector circuit c pin to each I pin
The 99 and newer engines
Each valve cover has an electrical connection; each connector has 9 pins.
G G I I C I I G G
The two outer pins on each side connect to the glowplugs (G) under the cover.
The next two pins in connect to the injector (I) coils.
The center pin is a common (C) for the injectors coils.
You'll need a multi meter that can measure ohms.
Connect one lead (usually the balck one) to a good ground.
Then probe each of the outer pins on the connector.
Good glow plugs usually measure between .8 ohms to 1.5 ohms.
Some may be outside of that, but won't stray too far.
Bad plugs can measure anywhere above 20 ohms, for instance, when I replaced mine, I had three plugs that measured 800 ohms, two that where open or infinite resistance, and one that was around 600 ohms.
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The 99 and newer engines
Each valve cover has an electrical connection; each connector has 9 pins.
G G I I C I I G G
The two outer pins on each side connect to the glowplugs (G) under the cover.
The next two pins in connect to the injector (I) coils.
The center pin is a common (C) for the injectors coils.
You'll need a multi meter that can measure ohms.
Connect one lead (usually the balck one) to a good ground.
Then probe each of the outer pins on the connector.
Good glow plugs usually measure between .8 ohms to 1.5 ohms.
Some may be outside of that, but won't stray too far.
Bad plugs can measure anywhere above 20 ohms, for instance, when I replaced mine, I had three plugs that measured 800 ohms, two that where open or infinite resistance, and one that was around 600 ohms.
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From: the nutmeg state "CT"
Thanks for that. I wasn't really paying attn to the center pins because I was under the impression that I only need the outer 2 pins to test out at around 1 ohm. Or do I need to check the center ones too? It sounds like my last injector is reading off the charts and needs to be replaced.
I would assume this is what causes my truck to start with white smoke in the cold?
I would assume this is what causes my truck to start with white smoke in the cold?
Senior User
Joined: Sep 2013
Posts: 498
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From: Hagerstown, MD
Check injectors while you're there. If I'm not mistaken injectors will ohm out to between 3.5-5 ohms? Someone help.
Your white smoke at startup is likely a result of bad glow plug(s) or the GPR. Does it crank a long time before it fires?
Your white smoke at startup is likely a result of bad glow plug(s) or the GPR. Does it crank a long time before it fires?
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Senior User
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From: the nutmeg state "CT"
Cranks up pretty quick I would say. But as soon as the weather gets around 40d it will blow white smoke. The colder the temp the greater the smoke show.
The GPR tests out good as far as I can tell. I could always be wrong. I did replace it a couple years ago.
As for the injectors. I have the DP doohickey that runs a buzz test and they all sound good. I assume that's good enough?
I'm no expert
The GPR tests out good as far as I can tell. I could always be wrong. I did replace it a couple years ago.
As for the injectors. I have the DP doohickey that runs a buzz test and they all sound good. I assume that's good enough?
I'm no expert
Senior User
Joined: Sep 2013
Posts: 498
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From: Hagerstown, MD
Believe me, neither am I. Haha
But anyway, I think you have one or more bad glow plugs. I would do exactly what carltonwebb suggested. Find the losers then replace em with some shiny new ZD11s
But anyway, I think you have one or more bad glow plugs. I would do exactly what carltonwebb suggested. Find the losers then replace em with some shiny new ZD11s
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