Question about 1985 Ford F350

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Glow plug will not light up

I have a 1985 ford f350 with a 6.9 diesel and the glow plug light will not come on and it will not start up what could be the proublem

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  • mppru Aug 22, 2008

    glow plug light will not come on. truck will not start cold. starter fluid will start it and it will start the rest of that day. 1985 f350 ford 6.9 diesel.



    mppru@yahoo.com



    thanks, show pic of replacement parts if possible.

  • Anonymous Jan 19, 2009

    Have generally the same problem with my 1986 Ford 250 with a 6.9 L diesel. At times I need to turn the key 6 - 20 times before the glow plug indicator on the dash will light up for starting. Any ideas what the problem could be?

  • dizidave Apr 11, 2009

    Glow plug will not light up... truck won't start (haven't tried starting fluid). Do I need to change the glow plugs?

  • kbk8 May 11, 2010

    i have already replaced starter silenoid and glow plug silenoid.........when i turn key i get no fire from ignition to silenoid.............whats up?

  • kbk8 May 11, 2010

    i have no fire from ignition to starter silinoid, it will crank if i cross the two post on start silanoid....1985 f350 6.9 diesel

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Replace the solenoid under the hood mounted generally on the firewall

Posted on Jun 25, 2008

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Sounds like bad advice. If your glow plugs are bad, the last thing you want to do is try to start it. Remember, diesel engines use these glow plugs like coils in a toaster. Since diesel is harder to burn than gasoline, the glow plugs heat up to a combustible temperature, allowing the diesel to ignite and your vehicle to start. I don't know the reprocussions of trying to start it without them working...but it can't be good.

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Glow plugs


no this will not improve the performance of your diesel, the glow plugs are used to ignite the fuel at initial start up and then they turn off.

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