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Glow plugs won't turn on

Discussion in '1982-Present GM Diesel' started by cegusman, Dec 15, 2001.

  1. cegusman

    cegusman 3/4 ton status

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    Glow plugs won\'t turn on

    My glow plugs come on fine when the truck is cold, but when it is just barely warm thay don't come on at all ( It is not warm enough to start without the glow plugs). I can start the truck if I bypass the the relay and get them to cycle. I have allready replaced the relay and the glow pugs are good, What else sould I consider looking at or replacing?

    Houston, TX
     
  2. Danno

    Danno 1/2 ton status

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    Re: Glow plugs won\'t turn on

    I guess this is a fairly common problem with the early diesels like ours. One solution is to convert to the newer style glow plug controller, and relocate it. There's a writeup on http://www.thedieselpage.com (have to be a member to read it) that explains how to do the conversion to the newer style glow plug controller.

    I'm going to do this very soon, and I'll report back on how it goes.

    Anyone here already done this conversion?

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  3. 4x4_76

    4x4_76 1/2 ton status

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    Re: Glow plugs won\'t turn on

    I'm not sure that did I have this newer style controller on my C-10,but it had same problem.Glow plugs would not cycle if engine was warm enough.My sollution was to bypass the temperature sensor with switch,so when I was sure that glow plugs won't cycle,I just flip the switch,let the gp light go on once and started the engine.
    Controller was a small,grey box that was bolted on the back of the left head.It has row of small connectors on top of it and two bigger connectors were the +12 and glow plugs were connected.Was it the newer style controller?

    I'm too lazy to stick shift,that's why I prefer autotranny.
     
  4. cegusman

    cegusman 3/4 ton status

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    Re: Glow plugs won\'t turn on

    I don't have a membership to the diesel page and can't afford it right now. Can someone with a mebership post the writeup?

    Houston, TX
     
  5. Danno

    Danno 1/2 ton status

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    Re: Glow plugs won\'t turn on

    The easiest way to tell if you're using the old GP system vs. the newer one is to find out if you have a seperate GP relay. If you have a relay, you're using the older system. The newer GP controller has the relay built into it.

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     
  6. Tybee

    Tybee 1/2 ton status

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    Re: Glow plugs won\'t turn on

    The grey gox is the newer controller


    1984 GMC Jimmy 379 diesel, 700R4, 3.73s, 31x10.50 x 15
     
  7. braunm

    braunm Registered Member

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    Re: Glow plugs won\'t turn on

    I was told that they did not need to cycle when it is warm?

    Mike
     
  8. cegusman

    cegusman 3/4 ton status

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    Re: Glow plugs won\'t turn on

    I have the old style, Is the only other main part the glow plug controller, or is there a temp sensor?

    Houston, TX
     
  9. Danno

    Danno 1/2 ton status

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    Re: Glow plugs won\'t turn on

    I believe there's a temp sensor inside the GP controller.

    1984 K5 Blazer 4x4 Silverado
    6.2L diesel, 700R4, 3.42 gears, 31x10.5" tires
     

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