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  #21  
Old 03-16-2013, 12:51 AM
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After reading the service manual I'm wondering if the problem could be the Front Control Module (FCM). As I understand it the module controls a lot of the systems and provides things like power and grounds. I have also read that it can be responsible for 'flakey' acting gauge clusters.
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  #22  
Old 03-16-2013, 10:52 AM
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Goign out to pull the FCM, I'm thinking the circuit board has a bad solder point and as it heats up, the solder point semi seperates enough to cause problems...

I feel like im trying to find a needle in a haystack, but I feel confident on this one.
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  #23  
Old 03-17-2013, 10:05 AM
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I can see the FCM causing problems with lighting and even the gauges, but not the stalling issue. The IPM itself would seem a more likely suspect for that. Have you monitored fuel pressure, injector pulse and spark when the truck stalls to see which you seem to be losing?
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Old 03-17-2013, 10:16 AM
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Yeah, no spark, injector pulse is intermiten, fuel pressure is steady.

The PCM knows the truck stalled, but another part of the truck thinks it's still running. In fact last night fuel was coming out the intake becuse there was so much of it and no where else for it to go.

Could this be a bad ignition switch?
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Old 03-17-2013, 10:18 AM
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This seems to happen when it switches from open loop to closed loop.
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Old 03-17-2013, 08:01 PM
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Replaced ignition switch. Not the problem. Ran for 22 minutes after the switch.

Same issues. Truck thinks it still running, fuel pump and injectors operate.


Also thuroughly cleaned every ground on the exterior. 6 in the engine bay, 1 on the frame, and 1 on the engine. Could not find any other grounds.


Completely out of ideas.
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Old 03-18-2013, 09:22 AM
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Are you positive the pump is still running and have you checked for a stuck open injector?
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Old 03-18-2013, 09:51 AM
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Yes, I am positive as I stated before if it stalls in a position where there is an intake valve open gas will come out the intake manafold as it has no other place to go.

What do you know about:

AUTOMATIC RESETTING SOLID STATE TYPE - PTC
A Polymer PTC (for Positive Temperature Coefficient) is a special type of circuit breaker called a thermistor (or thermal resistor). A PTC thermistor increases resistance as its temperature in increased. PTCs, which are made from a conductive polymer, are solid state devices, which means they have no moving parts.

These are in the wiring of the truck and I honestly just learned about them after looking over the wiring diagrams for the truck and looked them up.

This sounds very promising as the issue is temp specific and I first thought it was engine temp specific, now I don't think so. We had the truck run for 22.5 minutes at this point it had gone from open loop to closed loop and was still running.

I am strongly thinking its an issue with the coil circuit and due to bad wiring within that circuit this PTC shuts the circuit down, stopping the truck from firing. The PCM never gets that message until the PTC cools down enough to send that signal to the PCM.
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  #29  
Old 03-18-2013, 10:00 AM
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I've never heard of or encountered any such thing in Dodge wiring and my factory diagrams show nothing in the coil driver circuit. Are you still getting the intermittent CKP code? I'm thinking once it gets hot, the signal is breaking down.
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Old 03-18-2013, 10:05 AM
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Page 640 of the service manual (8W-30-3):

See attached
Attached Images
File Type: jpg Image1.jpg (5.9 KB, 2 views)
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