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Old 06-20-2011, 05:19 PM
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Default Falls on its face....NEED HELP

I am some what new to the diesel world, but have plenty of basic knowledge of the diesel motor.
For starters i have accomidated a 1998.5 24 valve dodge ram that was in a wreck, all it needed was a few suspension parts and driver fender and bumper. Now that i have it all together and driving it for whatever reason falls on its face, doesnt matter if cruising at 65 or pulling away from a stop sign or pulling a 24' car trailer, it falls on its face but doesnt actually shut down. my dad is an old school diesel guy from back in the 80's and he rode with me when it happen and he thinks the wastegate is opening when ever it feels like even with minimal boost. Sometimes it doesnt act up at all. it does throw a code 1689 which is No Communication Between ECM and Injection Pump Module, but with how the truck is acting it seems like all wastegate issue. again this happen erratically, when ever it feels like. ANY HELP PLEASE.
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Old 06-20-2011, 05:23 PM
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Well, if the ECM is intermittently losing communication to the injection pump, I believe the pump shuts down so you are losing your fuel pressure.

You've either got a bad or corroded connection at one or both ends of that communication path. So check continuity for your wiring at the injection pump and back at the ECM.

The other potential is a ECM that has a glitch in it but that's unlikely. They don't partially fail...usually it's a total fail!
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