Remanufactured PCM's - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 02-19-2011, 06:02 AM Thread Starter
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Remanufactured PCM's

My EX has cold start problem. Will not start unless I plug it in for 3 hours. I changed the GPCM, glow plugs, and disconnected the EOTs. Still no cold start. I fear I may need a new PCM. Where is a good place to buy them? Also, who sells scanners that can be used on GM and Ford Diesels? Thanks
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post #2 of 7 Old 02-19-2011, 07:11 AM
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Wait a min...

You're going at this all wrong

Replacing stuff just because it could be the problem isn't the way to go, diagnose the failure first!

Why, exactly, have you now decided it's the PCM? Is it not sending ground to the GPR when it should? It controls the GP system by supplying a path to ground on the relays "coil" terminals. If it's not doing that then, I agree, you might need one, but check first

As for the scanner, you can't go wrong with the AE! I have a driveway full of cars and bought the "Domestic Package" (I think it was close to $700) and never looked back It's been an indispensable tool that All my friends want to borrow.....
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post #3 of 7 Old 02-19-2011, 02:51 PM
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Even a cheap obd 2 scanner from a parts store will give you a better start, see what codes are setting and go from there. Diagnostics at a reliable diesel shop are a good investment, saves rounds in the old parts shotgun!
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post #4 of 7 Old 02-19-2011, 03:27 PM
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Originally Posted by Cgaetz View Post
Even a cheap obd 2 scanner from a parts store will give you a better start, see what codes are setting and go from there. Diagnostics at a reliable diesel shop are a good investment, saves rounds in the old parts shotgun!
No, a "cheap OBD-II scanner from a parts store" is pretty useless on our trucks
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post #5 of 7 Old 02-19-2011, 08:04 PM Thread Starter
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Agreed

YEs I know, I have to invest in a decent scanner that can read diesel codes.
I'm just frustrated right now and fear the worst. Sadly, Excursions don't have a simple GPR they have a GPCM with dual relays connected to a module.

I wish I had a GPR. It would be easy do diagnose. As far as changing the oil, I just did last week. I run Valvoline Blue 15-40 Turbo diesel oil. The motor cranks fine. Plenty of power, new batteries, clean terminals. And yes, there could be a bad ground of some kind. Tomorrow we are going to see if the GP's are getting power with a test light. The glow plug light works. Check engine light is on. Need to get the codes.

Will keep you all posted. If my EX is doing it, I can guarantee they all will have the same problem eventually.
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post #6 of 7 Old 02-19-2011, 08:19 PM
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What's the mileage? A high-mileage or poorly maintained truck can have wear issues in the high pressure oil portion of the injector. I found this out after having no-start in cold weather issues. I tested everything I could think of, then took it to a dealer and spent nearly $1000 for a diagnosis which yielded nothing. I measured the injector armature clearances and found out they were worn beyond spec and needed to be rebuilt.

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post #7 of 7 Old 02-20-2011, 04:42 AM Thread Starter
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Worn Injectors

The truck has 195,000 miles. Once warmed up she runs like new. At this point I guess it could be anything. Frustrating. Also frustrating that diesel is approaching $3.50/ gallon US here in NJ.
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