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  #11  
Old 03-14-2013, 03:57 PM
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Just looked it up... going to do that now..
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  #12  
Old 03-14-2013, 04:38 PM
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From the block to the negative battey terminal 0.04 - 0.03 when running. From the body to the negative battery terminal 0.00.

Made a small video, After stall the injectors are still firing and the fuel pump is still running.

http://youtu.be/finHrN1z--k
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Old 03-14-2013, 05:31 PM
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Just tested again with lights on. From block to the negative terminal of battery, 0.23v while turning the engine over, would not start right away. As it got closer to starting it would slowly drop voltage. As it started (sorta, with help from giving it gas) voltage was still significantly higher than the 0.04 it should be and it ran horribly.

It's like there is a bad connection somewhere, but where?
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  #14  
Old 03-15-2013, 08:07 AM
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That video is just plain bizarre. After seeing that, I can't help but wonder if you have a PCM problem. Are you still getting the P0320 and P1391 codes?
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Old 03-15-2013, 10:30 AM
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It doesn' happen that way all the time... most of the time it just stalls out. I got thinking these trucks run on open loop and closed loop modes. During engine warm up it is in open loop mode and basically will ignore input from various sensors until operating tempreture is achieved.

This sounds a lot like what the issue is, but I don't know why. It runs great until it gets to operating tempreture, as I understand it open loop mode settings are predefined, once warmed up the PCM starts taking data from various sensors including o2 (which it subjegates til warm up).

The problem is the o2 sensors are brand new so i'm not sure how that is the issue, if the CAT was clogged it seems to me that the exhaust would be restrickted enough so that very little would come out of the tailpipe.

Then, I got thinking perhaps its an electrical issue that im not thinking of. Perhaps under the fuse box? Lastnight before I called it quits you could turn the key to the on position; normally the PCM would prime the fuel (I think for 3 seconds, the whir click) but this time the ASD was continually clicking and the fuel pump continued to pump until the key was turned of.

There could very well be electrical gremlins as the PO swaped out the motor 40k miles ago with a 'Factory rebuilt one' and it looks like he hacked into some of the wiring.

I think i'm going to pull the PCM today and verify that it is the correct one for the truck (Where is a good place to find that information out?) and clean the connectors and check grounds and things.
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Old 03-15-2013, 02:45 PM
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Ran perfect for 12 minutes or so then stalled out... I made a video but its large so I have to convert it first.

No codes up until it stalled. Code: P0320

When it stalled the fuel pump was still running and the injectors sounded like static.
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Old 03-15-2013, 04:20 PM
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Uploading video now will take a bit: http://youtu.be/OJPArzlPM5c

Also, found a PCM for $85 they will allow me to return if it doesn't fix the problem. Heading out to go get that.
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  #18  
Old 03-15-2013, 05:19 PM
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If the ASD relay is clicking it's because of either the power cycling or a bad connection. Power cycling could come from a faulty PCM.
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Old 03-15-2013, 08:48 PM
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Switched the PCM, That wasn't the problem. Exact same result. Run perfect for 12-14 mins then stall. I should also state the stall is direct, almost as if the key was turned off. And then fuel pump is still running while its stalled. Take the key out, put it back in and still the fuel pump runs.

It has to be electrical at this point.

Knowing that it runs perfect until it reaches a certain temperature leads me to wonder exactly what happens when that temperature is achieved. Knowing that answer would point me in the right direction to diagnose.

Any ideas?
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  #20  
Old 03-15-2013, 10:08 PM
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Also got "C-Codes", AA, AB, AC

AA = PCM messages not received. Refer to the appropriate diagnostic
information.

AB = TCM messages not received. Refer to the appropriate diagnostic
information.

AC = ABS messages not received. Refer to the appropriate diagnostic
information.
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