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Old 10-14-2006, 02:46 PM
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glow plugs

i know if i spent enuf time on this forum i would find answers to my questions but im going to ask, just to save time. i would think that my 83, 5 cyl turbo diesel needs glow plugs (hard to start when its below freezing) question is, do i use loop type or pencil type and what is the difference and what ohm reading should i have on the ones i have in there and how do i know whiat is in there without taking one out ? possibly i have only 1 or two bad ones and i can just replace those. $$$$$ is kinda tight, just had my durango transmission rebuilt and that used up prety much ALL my mtce. money & then some, for the MB. could someone guide me to links that will give me somse easy answers, please ? thnaks much in advance
davidh

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Old 10-14-2006, 02:54 PM
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An 83 will have pencil type plugs. The easy way to tell is by looking at the connectors. Pencil type plugs have a flexible wire to each plug. Loop plugs have a rigid metal strip going from plug to plug.

Sixto
93 300SD
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Old 10-14-2006, 02:54 PM
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You have the PENCIL type. 1 or 2 not working will definately give you starting problems in cold weather. Go to the glow plug relay located on the drivers side inner fender well and find the relay. Pull the black cover off and check the strip fuse. Make sure that the screws are tight. Find the small 5 prong socket plug and pull it from the relay. You can then take a test light or OHM meter and test each glow plug. I believe the wires are color coded so you can find which one might be faulty.
In cold weather it is good to cycle the glow plugs twice before starting if you are experiencing problems starting. LIGHT throttle helps but very LIGHT.
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Old 10-14-2006, 02:55 PM
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I think the spec is 1.7 ohms for each plug.

Sixto
93 300SD
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Old 10-14-2006, 03:45 PM
Craig
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Quote:
Originally Posted by sixto View Post
I think the spec is 1.7 ohms for each plug.

Sixto
93 300SD
It should be closer to 0.6 ohms, cold. It will usually read "infinity" if it's bad.
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Old 10-14-2006, 07:19 PM
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Try hooking a wire from bat positive to the glow plug wire. It should spark when removed. This indicates current flow. If there is no current flow the glow plug is not heating up.
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Old 10-14-2006, 07:36 PM
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Glow plug testing.
Glow Plug Testing?

Symptom of 1 or 2 bad glowplugs...
Symptom of 1 or 2 bad glowplugs...

Don't always trust your glow plug indicator light!
Don't always trust your glow plug indicator light!

Glow Plug Relay
Glow Plug Relay

Glow plugs link thread
http://www.peachparts.com/shopforum/diesel-discussion/137732-glow-plugs-link-thread.html#post1019018

Replacing Glow Plugs
http://mbdieseldiy.tripod.com/glowplugs.htm



Cold weather starting links
http://www.peachparts.com/shopforum/diesel-discussion/137674-cold-weather-starting-links.html#post1018529

Starter health important to your diesel?
http://www.peachparts.com/shopforum/diesel-discussion/107318-starter-health-important-your-diesel.html#post739798

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