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Stalling and stumped!

turbovanman

turbovanman

I has boost, :O)
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Ok, I guess a first time for everyone. I have a customers recently purchased 95 K1500 6.5 turbo diesel, code "S" engine with EGR. History unknown except he's had a Gray PMD installed with a cooler and I've noticed the injection pump has been replaced but when, who knows, but I would guess 4 years or longer.

Anyhow, came in for stalling, never did it so but rad and condensor were plugged solid, temps were around 108 deg C so fixed all that, new stat, fixed some fuel leaks and off he goes, said he lasted 2 days then started stalling. Never did it for me, except when he came to pick it up, then finally it did it, heat soaked for an hour, outside temp was 29-30 deg C, would crank and no start, installed scanner and it fired right up. Installed a known good PMD, took a week to stall, so here it is and its either the pump or computer, but I can not get it to stall. No codes but based on past experiences, its probably the pump but just need a little reinforcement or I missed something. TIA.
 
I would also shine up the ecm and fsos fuse spades, I've had trouble with them.
 
TVMN,

Take a look at gnds especially ones rear pass side head those are the ones that the puter needs to stay happy corrosion there can cause intermittent s, need to be shiny clean, also check where lug is crimped to wire see if corrosion there or wicking its way into the wire.

You said grey PMD that is a replacement for that vintage, where is it mounted and where did it come from, some aftermarket vendors have had issues with supplied harnesses does the harness look to be OEM ?, the gnd wire on the IP fuel solenoid harness is it still connected to the IP or has it been relocated.
 
Hi Turbo.. I agree with Tim. Grounds first, then fuse spades and harness connectors on the new PMD (an old toothbrush and some NalOx works wonders!).

After that, you are probably into IP country. :(
 
I'll check the grounds but to me, its heat related.

Its a Standadyne brand new replacement with a new extension, the cooler is mounted off the hat, which I've seen on other trucks and never had an issue. My tester is the old black one and it connected without the jumper harness. The ground is still on the pump.

Thanks for the ideas, I'll check them out on Monday.
 
It probably was heat-related.. but you fixed that. my experience is that removing the heat issue (good job, btw) won't help, once the damage is done.

If it is a PMD issue, (and if it was an old one), I'd suggest re-torquing the nuts on the transistors... people have gotten some pretty good life out of that. I'm not sure how the new ones react to that, or if it even helps.

But Hey, good luck with it!
 
Ok, it will not stall for me, grrrr, lol. Grounds are minty so quoting him on a pump job. I HATE guessing.
 
Would the EGR stuck wide open stall the engine?
 
This has electrical written all over it. How would an IP fail and cause stalling only to restart immediately? That is what I keep asking and don't see a way it could.
 
Did you ever find the cause? Just wondering, because mine is now doing the same thing. IP, PMD? I have done Grounds, and hoses, still doing it, and still getting worse...
 
Nope, we put another PMD in, still stalled but the temp has gone down so its not so frequent anymore. I told him its either the pump or the computer and that was a month ago, haven't heard back from him.
 
Is the 'puter that common a failure? When setting the timing recently, I tried a KOKO procedure multiple times, and it would not take. In the past when I have done it, you can tell 'cause it will idle rough while it is setting TDCO. But same situation, when warmed up, pickup will run down the road all day long. I am still troubleshooting, because I put a reman pump on on just 18 mo. ago. I am hoping it is not pump, because that will be an expensive venture if it has to be done every 2 years!
 
indybeck said:
Is the 'puter that common a failure? When setting the timing recently, I tried a KOKO procedure multiple times, and it would not take. In the past when I have done it, you can tell 'cause it will idle rough while it is setting TDCO. But same situation, when warmed up, pickup will run down the road all day long. I am still troubleshooting, because I put a reman pump on on just 18 mo. ago. I am hoping it is not pump, because that will be an expensive venture if it has to be done every 2 years!
Click to expand...

You always have to try your spare PMD? You do have spare PMD?
 
Yup, tried a different on that I had, and still same thing...buuuut, unplugged FSD plug, and plugged it back in, and to my surprise it started and ran. It has stalled like this, only when cold, with both PMDs...driving me crazy! :mad2:
 
To both of you on the stalling.

How is the fuel pressure????
some trucks die right away if the LP fails or fails to pump for a second or two if the IP transfer pump is weak.

Only way to monitor this gremlin is to have a permant fuel gauge in cab
 
Pressure is at a steady 8.5 to 9 at idle. When truck stalls pressure builds to 12. I have done a flow test. All checks well. I am not losing pressure, and I have eliminated air in the lines. Any other ideas? Thanks for the suggestion, sometimes I forget the E-Z stuff, and get frustrated right away...:doh:
 
indybeck said:
Is the 'puter that common a failure? When setting the timing recently, I tried a KOKO procedure multiple times, and it would not take. In the past when I have done it, you can tell 'cause it will idle rough while it is setting TDCO. But same situation, when warmed up, pickup will run down the road all day long. I am still troubleshooting, because I put a reman pump on on just 18 mo. ago. I am hoping it is not pump, because that will be an expensive venture if it has to be done every 2 years!
Click to expand...

PCM fails are rare, KO/KO won't work if you are not >170F coolant temp or if you have a stored code in PCM even the ones that don't turn on the CEL can keep KO/KO from happening properly.
 
what harness do you have on your remote, and can you describe the remote ? your spare FSD was it ever a under hood mount?

Bad/weak lift should not shut you down healthy IP can pull its own fuel, may make it run like crap under load, do a bison says though as xfer pump in the IP may be on ragged edge, check with gauge plumbed to the filter mgr and gauge in cab and go for test drive , pressure @ idle/unloaded doesn't tell much.
 
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