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Glow Plugs or GP Controller?

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Old Mar 15, 2011 | 12:10 AM
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Question Glow Plugs or GP Controller?

When I go to start my truck, the glowplug light comes on, then goes out (1-2 seconds) at dead cold.

After which I get a series of clicks, no light, the interior lights flicker with the clicks, but even then, it doesn't start as easy as I have seen on other trucks with the same equipment.

I've been thinking it's a glow plug issue, but I'd rather base my purchase on outside opinions from those more into the knowledge of this than I.

Thanks in advance.
 
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Old Mar 15, 2011 | 12:52 AM
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Hello, I just picked up a 87 6.9 and it does the same thing. I turn on the key and light only comes on 1-2 sec and the controller starts clicking. From what I found that is the controller telling me I have bad glow plugs. I am not sure of the accuracy of the info so I will be testing my glow plugs soon. It sounds reasonable because my truck is a little hard starting (about 20 sec) when cold in the morning. But when its warm it starts instantly.
 
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Old Mar 15, 2011 | 12:57 AM
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Mine is that way too, she starts great when the motor is warm, at a dead start she takes 2-3 cranks to get going.

Let me know what your prognosis is bud, I'd like to know, I was thinking of testing mine as well.......if 3 are bad, 8 new ones are going in.

I pulled the connectors off some of mine today, out of 5, 2 looked newer.

makes me a bit apprehensive.
 
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Old Mar 15, 2011 | 01:57 AM
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The controller is cycling fast to save the last few glowplugs. Replace the daed plugs and the controller will cycle normally. To test the plugs hook a test light to the + side of the battery and pull the conector of the plug and touch the light to the plug if it lights its good. Remember only use motorcraft glowplugs
 
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Old Mar 15, 2011 | 02:17 AM
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From: Elkhorn, Wiscompton
Originally Posted by 84-6.9L
The controller is cycling fast to save the last few glowplugs. Replace the daed plugs and the controller will cycle normally. To test the plugs hook a test light to the + side of the battery and pull the conector of the plug and touch the light to the plug if it lights its good. Remember only use motorcraft glowplugs
I hate shopping at O'Reiley's, but they are the ONLY one's in town that have ZD9 plugs.

I'm aware of what happens when you don't install ZD9's.
 
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Old Mar 15, 2011 | 08:10 AM
  #6  
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7.3 Liter Diesel Motorcraft Glow Plugs - Ford 7.3 Liter Diesel Motorcraft Glow Plug - Diesel Filters,Additives,brake rotors, and brake pads for Chevy, Dodge and Ford Diesel Trucks
if you can wait and mail order, these guys have the ZD-9 plugs for $9.99
the clicking you hear after the wait to start light goes out is the controller working properly. it cycles the plugs after starting for a while to help the cold engine stay running. after the engine hits a certain temperature, a temp sensor shuts the glow plug system down. that is why you will not see a wait to start light with a hot engine.
 
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Old Mar 15, 2011 | 08:21 AM
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same problem

i got a new controller and relay, now my wires r falling apart going to the glow plugs along with the connectors. i fixing the wires today and where they connect to the glow plugs . 90 f350.
 
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Old Mar 15, 2011 | 11:18 PM
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I tested all my plugs exactly as 84-6.9L said to, take his advice, it worked, 4 of 8 were dead, replaced them, the light stayed on, controller worked, and she fired right up.

Thank you all.
 
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Old Mar 16, 2011 | 01:16 AM
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Prices are almost the same as TJC transport's place...... might save on shipping depending where you are.......

Motorcraft Glow Plugs (set of 8) 7.3 IDI Diesel '87-'94
 
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Old Mar 16, 2011 | 01:27 AM
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From: Elkhorn, Wiscompton
Originally Posted by PLC7.3
Prices are almost the same as TJC transport's place...... might save on shipping depending where you are.......

Motorcraft Glow Plugs (set of 8) 7.3 IDI Diesel '87-'94
I already got the problem fixed, but thank you for your help man.
 
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