Engine Hiccupping...
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Yep - Definitely electrical issue. Drove it a short distance over some dirt roads to pick-up a lawnmower and it acted all sorts of stupid. Have I mentioned I dislike tracing out electrical problems?
Elder User
Joined: Sep 2014
Posts: 862
Likes: 7
From: like subarctic, brrr man!
I would start by running the engine, and manhandling the wire harness, and each connector. But not so hard you hurt it, or yourself on moving parts...
If something hiccups while your doing that, great! you can narrow it down some.
If Not, then maybe go through each connector looking for anything obvious, like corrosion on the Throttle Plate Sensor Connector. Use a bit of spray lubricant to help pull the connector apart and some small screw drivers.
Hoping it's something obvious you can easily spot and repair... And try not to despair about wiring, it knows when you hate it
If something hiccups while your doing that, great! you can narrow it down some.
If Not, then maybe go through each connector looking for anything obvious, like corrosion on the Throttle Plate Sensor Connector. Use a bit of spray lubricant to help pull the connector apart and some small screw drivers.
Hoping it's something obvious you can easily spot and repair... And try not to despair about wiring, it knows when you hate it
Thread Starter
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Found it!! Well sort of...
I went out and performed the wiggle test and discovered that the problem is in the connector to the ECM. Wiggle the wires and it goes all sorts of stupid. Now I need to decide how to fix it...
I went out and performed the wiggle test and discovered that the problem is in the connector to the ECM. Wiggle the wires and it goes all sorts of stupid. Now I need to decide how to fix it...
Thread Starter
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Complete engine harness has been pulled from the truck. Lots of corrosion in the pins on the connector to the control module - so much that you can see it coming up from the wire side. I certainly hope this is the exception more than the norm or I may have fun finding another one.
Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
Now, mix that with a 2015 f250 diesel. Customer blue in the face mad, "I paid $65.000 for this and I can't drive it!". When you have that, you've got a "time limit", until he blows a gasket. Then, you find ONE pin in the 120 for the pcm that fits loose.
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Yeah - that's a nasty mix all right Vince. Can you fix the pin or have to order a complete replacement harness?
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Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
They do make replacement pins. You have to remove the bad one from the connector (intricate work) match up the correct replacement, splice in the wire, then re-install.
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Replaced the entire harness with a good looking one from a junkyard and it still cuts out. Upon closer inspection on the "remanufactured" engine control computer, it has several loose pins in it. I'm getting another under warranty, but it won't get here until Thursday...
This is just plain frustrating...
This is just plain frustrating...
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
So far I've found 3 - 2 are involved with diagnostics and the other is the fuel pump.
When I get it back together again, I'm hesitant to take for a test drive. For a brief moment it will be fixed and I don't want to know if it isn't.
When I get it back together again, I'm hesitant to take for a test drive. For a brief moment it will be fixed and I don't want to know if it isn't.
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Lead Driver
Joined: Aug 2009
Posts: 7,573
Likes: 250
From: Laquey, MO
Progress!
I stabbed in the replacement engine control unit in this evening and it seems to have solved the problem. I've slammed the doors & hood, driven it at freeway speeds, and have found the bumpiest roads I could and it has yet to miss a beat.
I stabbed in the replacement engine control unit in this evening and it seems to have solved the problem. I've slammed the doors & hood, driven it at freeway speeds, and have found the bumpiest roads I could and it has yet to miss a beat.
Elder User
Joined: Sep 2014
Posts: 862
Likes: 7
From: like subarctic, brrr man!
Most excellent!
Corrosion isn't that great for conducting electricity! I like using white grease and dielectric grease to help protect the connections. Especially if there is a lotta moisture and water.
Corrosion isn't that great for conducting electricity! I like using white grease and dielectric grease to help protect the connections. Especially if there is a lotta moisture and water.
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