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Old 01-04-2009, 04:53 PM
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Tech Please Help, Reward Offered

I had another thread about this but I am starting a new one. I had my cab off for some work and upon completion the glow pluggs no longer work on the truck. It has no GP codes in it. Although Had many other codes, due to all the things that are unhooked from the truck. Egr, VV selanoid, Fuel pump. The tech who is my friend did this scan for me when they wasn't very busy the one day @ work. It shows Engine oil temp, also Intake temp, and coolant temp. The truck was running and he did a glow plug test, They worked just fine when he did this.(made the truck buck when they lit) He was concerned that everything unhooked was messing w/ the pcm, So I took it home unhooked the batteries and hooked the egr vv and fuel heater. Still no power to the plugg on the Valve cover. I have power @ plugg on the moduel also have power to #9 w/ key on. The light on the dash comes on as normal than goes off. I have checked all the connectors that I had undone still nothing. He said that he made the pcm turn on the glow pluggs in that test, so he thinks that the pcm just isn't seeing something to turn the gp's on. I am going to link the other thread also so if there is anything in there I might have wrote I forgot here. If you want PM me and i will give you my phone # so i can tell you anything you need. I will give a gift cirtifcate to anyone that can figure this out. Thanks Dusty Here is the other thread Need some tech assistance please
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Old 01-04-2009, 04:57 PM
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Are there any loose grounds?
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Old 01-04-2009, 05:01 PM
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Are the coolant, oil, and intake sensors sending the correct reading to the PCM?
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Old 01-04-2009, 05:17 PM
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Originally Posted by 2005F250 View Post
Are the coolant, oil, and intake sensors sending the correct reading to the PCM?
Yes they are, Grounds all seem to be in check also.
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Old 01-04-2009, 07:20 PM
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To the top
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Old 01-04-2009, 08:00 PM
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not a tech....just curious if you've tested continuity between any wires that go from the pcm to the GPR or anything that goes from the cab to the engine.......as in if you perhaps broke a wire (like stated) when you were taking it apart....or putting it back together.

Testing for continuity and shorts. both fairly easy to do with a wiring diagram
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Old 01-04-2009, 08:01 PM
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then again, if they were turned on by the ford 'puter....i guess that doesnt make sense eh?
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Old 01-04-2009, 08:06 PM
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Just a shot in the dark but have you tried using stock tuning, if thats possible? Or what shuts the glow plugs off? maybe that part is the problem.
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Old 01-04-2009, 08:43 PM
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then again, if they were turned on by the ford 'puter....i guess that doesnt make sense eh?
I have looked for broken wires or pushed pins but can't find any. The ford puter turned them on when it was running. He says he made the pcm turn them on but I still wander if it looks at EOT and coolant temp when it does this test, since the truck was running.I have debated trying a continuity test between the pcm and the GPM, but like you said it doesn't make sense if the ford puter will do it.
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Old 01-04-2009, 08:44 PM
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Originally Posted by 2005F250 View Post
Just a shot in the dark but have you tried using stock tuning, if thats possible? Or what shuts the glow plugs off? maybe that part is the problem.
Tried stock tuning this morning, Nothing Then loaded another tune, Nothing
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