Turbo shut down

[Soapy]

I was coming home from a off road event and my sons diesel JLU started having an issue. we had been driving home for about 6 hours, air temp. was 80 and we were running around 80mph. We stopped at a rest stop and then when we proceeded the Jeep had very little power. 55 was top mph. He had seen this before and we pulled over, let the engine cool for a bit and then proceeded. It went about 60 miles running fine then lost power again. We limped home at 55 the rest of the way. My question is what caused this and how to prevent it. I know he is getting ready to do the DEF delete kit from Canada and he said that will take care of this. I suspect that now after it has cooled down it will run fine today.

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[greige]

Sounds a little bit like the derating issue people have been talking about where there is some sort of overheating happening. I have the diesel but have not yet had the issue.
Personally, and this is debated in the below and other threads, I'm pretty sure it's exhaust gas temperature (EGT) that triggers the derate.
I drove my brother's LC with a reman V8 turbo diesel with a 5 speed. Going up mountain hills in 5th gear will spike the EGT fast, and the solution is always to downshift. It moves more air through engine and requires a bit less of the turbo, letting the EGTs calm down.

Good thread here: https://www.jlwranglerforums.com/forum/threads/towing-with-3-0-diesel.70886/

 

[BDinTX]

I’ve heard stories of heat soak causing a similar issue but I don’t believe it comes back after the initial cool down once you’re back on the road.

If he hasn’t already been pulling codes he should get JScan and all the fixin’s to do that. I wouldn’t think a DEF delete would make a difference.

 

[Soapy]

No codes generated and no check engine light. He did let it build boosthave his taser to clear codes if there had been any. Other than lack of power engine ran without creating any smoke. I think there is some kind of valve that opens taking turbo pressure away from the engine and won't let it build boost like a blow off valve. I guess the european versions of this engine do not have it.

 

[Ratbert]

That happened to us in Utah while on our way to The Rubicon. It turned out to be the result of a mouse making its home in the filter box. Check that first.

 

[Soapy]

That happened to us in Utah while on our way to The Rubicon. It turned out to be the result of a mouse making its home in the filter box. Check that first.

That sounds like a good possibility.

 

[flick2614]

Is he lifted? Bigger tires? Geared? I have to imagine that running 80mph in 80 degree weather had something to do with it, especially on larger tires.

 

[Soapy]

He is running 38x 11.50 r 17 Toyo RT Pros so I am sure that and not being regeared had a lot to do with it. EPIC 4x4 on you tube had a good session on the ecodeisels this week.

 

[flick2614]

He is running 38x 11.50 r 17 Toyo RT Pros so I am sure that and not being regeared had a lot to do with it. EPIC 4x4 on you tube had a good session on the ecodeisels this week.

38’s, not re-geared, and running 80mph for 6 hours. Gee I wonder what the issue could be?

That turbo was working harder than an ugly stripper.

 

[Soapy]

I was leading just driving along in my Power Wagon since I had the radar detector. I should have backed it down from 85 to 75 and things would have been fine.

 

[Ratbert]

38’s, not re-geared, and running 80mph for 6 hours. Gee I wonder what the issue could be?

That turbo was working harder than an ugly stripper.

Wouldn't it only be running about 1,750 to 1,800 RPM?

 

[flick2614]

Wouldn't it only be running about 1,750 to 1,800 RPM?

Possibly, but even the slightest little hill would cause it to downshift at least one gear and spin the turbo. My guess would be that it was in 6th-7th gear most of the way with the turbo screaming, fully loaded down for a trip too.

Mine won’t hold 80mph in 8th gear at all and I’m on 37’s.

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