Help with diagnosis

[JohnC]

I vote for bad PMD. It's been years, but, IIRC, the ECM only reads the resistor value when you do a TDC offset learn, although there may be some seemingly random set of conditions that causes it as well, but it definitely is not done on any kind of regular basis.

I don't remember if the resistor is isolated from the rest of the PMD circuits, but if it isn't, then a shorted resistor would affect PMD operation.

[More Power]

Too many 6.5 owners have installed a #9 resistor because someone sold it with a PMD kit or they mistakenly thought a #9 would give them more fuel. I wrote an article some years ago about resistor values in an attempt to dispel that myth, but it continues.

Anyone who communicates with me directly will get the response "install a #5 resistor in any new PMD or spare PMD if you don't know what value resistor the original PMD had installed."

We know that some 6.5 systems won't operate correctly with a #9.

[phantom309]

The resistor is a 5,. To be honest i don't know whats in the pkup pmd.
Questions that i have tho,.
Why all good till 175f?
What is significance of 175f?
Why was it over fueling and retarding?

Drove it today, just smiled away! I like this 2wd burb
I will put the big exhaust on it, and the bigger turbo,.and a set of 3:23's

[More Power]

The resistor is a 5,. To be honest i don't know whats in the pkup pmd.
Questions that i have tho,.
Why all good till 175f?
What is significance of 175f?
Why was it over fueling and retarding?

Drove it today, just smiled away! I like this 2wd burb
I will put the big exhaust on it, and the bigger turbo,.and a set of 3:23's

I've never actually tried to watch the stepper motor function when first starting the engine, but I would be interested to know whether the stepper is moving.

I have a number of failed DS4 components that I use for show-n-tell. Among those components is a terribly galled piston that is normally moved by the stepper motor. That part rotates the ring inside the pump, which partially controls timing. A galled/frozen piston will lock the timing in one position - maybe in your situation where it needs to be for a cold start.

P0236 - Turbocharger Boost System: Not an issue for the problem you're describing.

P1214 - Injection Pump Timing Offset: Usually only a problem when a replacement pump has been installed. Performing a Timing Offset procedure corrects it. Can you do this? Not being able to perform a Timing Offset Procedure usually requires a new pump.

[phantom309]

I've never actually tried to watch the stepper motor function when first starting the engine, but I would be interested to know whether the stepper is moving.
P1214 - Injection Pump Timing Offset: Usually only a problem when a replacement pump has been installed. Performing a Timing Offset procedure corrects it. Can you do this? Not being able to perform a Timing Offset Procedure usually requires a new pump.

I haven't done a koko since i did it when i changed pmd's, i'm not sure why you think the stepper is seized, if i unplug the ect it rattles with lots of timing,. In fact that was the first work around i did. When i start it cold(25f here) it rattles hard till it warms a little and the rpm slows,.
troubles would always start at 175f,. As if a switch had been turned on,. If i were to start the engine at 150 it would behave normal till it warmed a little more.
Nobody seems to have an answer as to why 175f is so relevant to a 6.5,.
There is lots of confusion on obd2 in general on 6.5's.

I can remember being told on another forum that i got banned from my 5068 pump wouldn't run with the chip set for 5521,. That was After i had been running it for 6 months,.

So another 6.5 quirk with a wonky resistor unexplaianed.

[More Power]

I haven't done a koko since i did it when i changed pmd's, i'm not sure why you think the stepper is seized, if i unplug the ect it rattles with lots of timing,. In fact that was the first work around i did. When i start it cold(25f here) it rattles hard till it warms a little and the rpm slows,.
troubles would always start at 175f,. As if a switch had been turned on,. If i were to start the engine at 150 it would behave normal till it warmed a little more.
Nobody seems to have an answer as to why 175f is so relevant to a 6.5,.
There is lots of confusion on obd2 in general on 6.5's.

I can remember being told on another forum that i got banned from my 5068 pump wouldn't run with the chip set for 5521,. That was After i had been running it for 6 months,.

So another 6.5 quirk with a wonky resistor unexplaianed.

I didn't say I thought the stepper was seized... I said: "I would be interested to know whether the stepper is moving." The more likely part(s) that would be subject to seizing is/are the "advance piston" and related parts.

The timing stepper motor pulls up on the pivot shaft to advance fuel injection timing.

Why were you banned on another forum?

[phantom309]

Why were you banned on another forum?

Turbine doc and i went a couple of rounds when i posted what my motor put down on the dyno with a converter lockup switch.. Was called a liar, i don't take kindly to that. I was using a chip of unknown origins, with the 5068 pump. Was told it wasn't possible.
Even the dyno printout was questioned Tim was a moderator and didn't like my tone in a pm so i was banned. That was a pm, not a post on the public forum.

[phantom309]

Performing a Timing Offset procedure corrects it. Can you do this? Not being able to perform a Timing Offset Procedure usually requires a new pump.

Well,.i finally bought enough double double coffee’s that the young guy that owns a local shop hooked his box up to the truck. It’s showing 10.5 deg timing when idling with -1.50 tdco?
But,. When he tried to do tdco procedure it started lumping and smoking like it did before,.so he cancelled and it wemt back to running nice.
I can unplug the ect and you can hear advanced timing,.when it starts cold it rattles for a while. So it is changing its timing,?
You state if it wont do the tdco learn the pump is nfg? Why?
My mileage, with cold weather starts and high idle on, is still 19.2 mpg with 3:73’s and 265-75 tires. I’m happy with things and even if the pump is pooched i’m going to runit till it quits,. Sleeping dogs etc,..

[JohnC]

It's been since 2006, but, isn't it the case that if it stalls during the TDCO procedure the base timing is way off? Try advancing the pump an eighth of an inch and re-running the TDCO set again. -1.5 is a good number, IIRC, but is the number stored last time TDCO set completed successfully, and probably has nothing to do with your current situation.

[phantom309]

It's been since 2006, but, isn't it the case that if it stalls during the TDCO procedure the base timing is way off? Try advancing the pump an eighth of an inch and re-running the TDCO set again. -1.5 is a good number, IIRC, but is the number stored last time TDCO set completed successfully, and probably has nothing to do with your current situation.

2006 john? I’m confused?

The truck did do a succesful koko when i changed pmd’s ,.. and has been running great since. Starts cold well( 1 hole catches up after 4-5 seconds) good on fuel , plenty of power, cruise works😁,. I was just curious to see what it was actually set at, and the guy just tried a tdco learn on his own volition. I almost crapped myself when it started making smoke and running rough!! He cancelled it and i basically said leave it alone thanks very much!! 😳