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GP or GPC ?

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Old Apr 13, 2010 | 10:32 AM
  #1  
gummybear918714's Avatar
gummybear918714
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From: Friday Harbor
GP or GPC ?

Have an 86 F250 w/6.9L.. Starts fine when warmer plugged in. Runs fine after started. Is it the controller or the glow plugs themselves. Whats the best way to determine which is going or is bad?
 
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Old Apr 13, 2010 | 11:38 AM
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Festus Hagen's Avatar
Festus Hagen
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From: Maine (NorCal Native)
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By reading the stickies at, Pre-Power Stroke Diesel (7.3L IDI & 6.9L)

-Enjoy
fh : )_~
 
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Old Apr 13, 2010 | 05:45 PM
  #3  
gummybear918714's Avatar
gummybear918714
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From: Friday Harbor
Thank you for the reply however I have looked thru and read them but didnt find anything exact to the query of my question. I found how to chk the glow plugs but im still trying to find if it would be the controller, the relay or the glow plugs themselves. Im a novice to the diesel engines but it seems to me that if the truck starts while hooked up to the engine warmer that it could very well not be the glow plugs that are bad. I just need some direction as to where to start the diagnostic so as I dont purchase anything unnecessary. Thank you and I will keep looking.
 
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Old Apr 13, 2010 | 09:19 PM
  #4  
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Dave Sponaugle
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From: Nutter Fort, WV
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gummybear91814,
Welcome to FTE and the IDI diesel forum.

The first step you should take is check the glow plugs to see if they are burnt out.

Does the wait to start light, right side of the steering wheel in the diesel indicator panel.

Do you here any clicks when you turn the key on with a cold engine?
 
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