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Discussion Starter #1 (Edited)
Hey All,

2002 F350 7.3 with Edge Evolution

Truck was running great, then suddenly lost half power.
Stopped the truck and turned ignition off then restarted.
Truck ran fine for a few more minutes, then same loss of power.
Checked through the Edge for the code: P1316 and cleared it.

This time I cleared the codes on the fly using the Edge and
the engine started running fine for a few minutes before the same
loss of power. Every time I reset on the fly, the engine would immediately
run fine for a minute or so.

Is my PCM going bad? Your thoughts?
 

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First, your Edge is really only a half-assed scanner and you need a real diagnostic tool to find out what's wrong. A P1316 is to the IDM, kinda like what the SES light is to engine or a flashing OD light is to the Trans. It's telling you you need to perform tests in order to enable the IDM to further resolve the issue and generate More codes that will direct you to what the problem is.

From what you're describing, my guess for the most likely cause, would UVCH issues (Under Valve Cover Harness) Have a look at this vid to see if it sounds like the problem -> http://www.youtube.com/v/GHwjEfJtM_g&hl
 

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Discussion Starter #3
Thanks. When I read up on P1316, I figured that was the problem.

I just thought it odd that I could get the engine to perform fine
simply by resetting the code on the fly.

The difference between my truck and the video is that the video truck
started up that way. Mine starts and runs fine, then loses cylinders.

I'll get it checked out and post here in the next day or two.
 

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Ya know, I haven't ever just cleared the 1316 over & over and kept running to know what would happen. Maybe you're right it could be an internal IDM problem that, by resetting the code, makes it run fine for a bit (hope not, that 50cent mod is a cheap fix) :)

If you can get it on something that will perform a buzz test and retrieve the IDM codes generated it would narrow it down some...
 
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