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My '03 6.0 has recently started stalling under load, whether from towing or just running on the interstate with A/C going in hot weather.
Usually the oil temp gets up to around 205+
First happened when towing heavy uphill but now happens when driving home unladen with A/C
When it stalls, I can pull over and restart right away.
If I sit and high idle a few minutes to bring down temps, such as at the base of a big hill, I can get up the hill before it stalls again.
When it stalls, IPR% is commanded to 85% and ICP is falling off. If I notice and back off, I can often avoid stalling by driving slower and/or turning off the A/C
So it is a stall caused by an intermittent loss of ICP when under load.
I have had failed o-rings a couple times before and fixed it. Also replaced HPOP last year. This is different from those things in that I can restart immediately, so whatever is causing the loss of ICP goes away while the engine is still hot, unlike an o-ring issue.
I have spent hours googling and can't find one quite like this.
My current guesses are, in no particular order:
-failing low pressure oil? The dash gauge will still show good press down to 5-7 psi, so it could be dropping off and I wouldn't know
-bad ipr? I swapped it out with a different unit and same symptoms. The unit I swapped in was on this truck previously and was replaced when I replaced the HPOP. (Last year I had replaced the IPR hoping it was the problem when it was in fact the HPOP)
-bad ipr pigtail? I noticed fraying on pigtail when I replaced HPOP and IPR last year so I replaced the IPR pigtail as well. Maybe i effed up the crimps, or maybe the pigtail is aftermarket and somehow failing when it gets hot under the hood?
Any ideas would be welcome. I have fixed this thing a half dozen times in the last 18 months and have gotten pretty familiar with it but this time it is kicking my butt.
Usually the oil temp gets up to around 205+
First happened when towing heavy uphill but now happens when driving home unladen with A/C
When it stalls, I can pull over and restart right away.
If I sit and high idle a few minutes to bring down temps, such as at the base of a big hill, I can get up the hill before it stalls again.
When it stalls, IPR% is commanded to 85% and ICP is falling off. If I notice and back off, I can often avoid stalling by driving slower and/or turning off the A/C
So it is a stall caused by an intermittent loss of ICP when under load.
I have had failed o-rings a couple times before and fixed it. Also replaced HPOP last year. This is different from those things in that I can restart immediately, so whatever is causing the loss of ICP goes away while the engine is still hot, unlike an o-ring issue.
I have spent hours googling and can't find one quite like this.
My current guesses are, in no particular order:
-failing low pressure oil? The dash gauge will still show good press down to 5-7 psi, so it could be dropping off and I wouldn't know
-bad ipr? I swapped it out with a different unit and same symptoms. The unit I swapped in was on this truck previously and was replaced when I replaced the HPOP. (Last year I had replaced the IPR hoping it was the problem when it was in fact the HPOP)
-bad ipr pigtail? I noticed fraying on pigtail when I replaced HPOP and IPR last year so I replaced the IPR pigtail as well. Maybe i effed up the crimps, or maybe the pigtail is aftermarket and somehow failing when it gets hot under the hood?
Any ideas would be welcome. I have fixed this thing a half dozen times in the last 18 months and have gotten pretty familiar with it but this time it is kicking my butt.
