6.5 wont stay running. No ideas anymore.

[SuperSport01]

JMJNet I swapped the pmd with a known good one and it made no change. However I am now going to have to replace the IP harness because I read your comment and messed with it. The wires are brittle and the plastic around each wire will crack.

Prior to "messing up" my IP harness I made two 4 ga. grounds that go from the engine to frame. I made another 4 ga. ground strap that goes from the rear harness ground stud to the battery ground stud. The truck did seem to start and run more smoothly when it decided to stay running.

 

[Burning oil]

I've got 2 brand new Stanadyne IP harnesses for grey PMD. $25. email if interested.

BTW if you run an extension cable you can use either type IP harness and the extension cable will still plug in.

 

[SuperSport01]

New Stanadyne IP harness installed and the truck acts the same as before. I tried my really old PMD... a known bad one that has a mind of its own... and the truck started immediately! It ran rough for a few minutes then went wide open on its own. It got to about 5000rpm before I could shut it off... oops.
I swapped back over to the Heath PMD and it returned to no start or start and run for a few seconds. Im going to send the Heath PMD back to Heath for testing.

 

[JMJNet]

Sounds like bad PMD to me.

Yes, send it back since I suspect it should be warranted.

 

[vegtech]

Imagine that. The symptoms all pointed to a pmd. Thats why people asked if a known good pmd was tried. Goes to show you, you can never trust the pmd, even a new one.

I have 5 6.5s in my fleet and each has a spare pmd in the drivers door pocket.

Sent from my ADR6350 using Tapatalk 2

 

[WarWagon]

New Stanadyne IP harness installed and the truck acts the same as before. I tried my really old PMD... a known bad one that has a mind of its own... and the truck started immediately! It ran rough for a few minutes then went wide open on its own. It got to about 5000rpm before I could shut it off... oops.
I swapped back over to the Heath PMD and it returned to no start or start and run for a few seconds. Im going to send the Heath PMD back to Heath for testing.

Send the extension harness back too as it could be the cause of the trouble rather than the PMD.

 

[SuperSport01]

I figured out the problem.
On the engine harness (under the intake manifold) the connector that the short IP harness plugs into... 1 of the 4 pins was burned. I cut the plugs off of the brand new IP harness and the engine harness then soldered/heat shrunk for a permanent connection.

For those who said PMD you were correct as well. I sent the PMD back to Heath and it tested bad. Heath sent me an entirely new setup but when the new PMD acted the same I knew to dive deeper into the wiring.

 

[Will L.]

Glad to hear you figured it out. Both at the same time, I say government conspiracy against you!!!

For real I say : db2 conversion.

 

[JMJNet]

So the KNOWN GOOD PMD works or it is KNOWN NOT TO BE WORKING?

If you put a PMD as spare, make sure they are good before retiring it as spare.

Put it on for a couple of weeks mounted on a heatsink and drive around with it.
If it is good, then retire it as a spare.

DON'T ASSUME NEW AS GOOD.

 

[Will L.]

So the KNOWN GOOD PMD works or it is KNOWN NOT TO BE WORKING?

If you put a PMD as spare, make sure they are good before retiring it as spare.

Put it on for a couple of weeks mounted on a heatsink and drive around with it.
If it is good, then retire it as a spare.


DON'T ASSUME NEW AS GOOD.

This needs to be a 4" x 5" sticker installed on every ds4 truck windshield with the addition at the end of "carried in the glove box at all times" on 2nd to last sentence.

 

[JMJNet]

More like 4 ft x 5 ft sticker. Just to make sure.

The sad part is people thinking that Heath's PMD does not fail.
Well, Heath does not make the PMD, he just put a kit together with a heatsink and ext cable.
The PMD still comes from whoever mfg it.