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Old 04-04-2013, 03:13 PM
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6.0 LS engine stumbles when warm

Hey guys,

Got the cooling system "burped" in the Diamond T today, and let the 6.0 LS engine warm up to temp. It runs great cold, but after about 5-10 minutes running, it starts to stumble badly, and will eventually die. When this happens, it won't re-start for a couple of minutes, but will start and run (seemingly) as it should for a couple minutes, then stumbles, bogs down and dies.

I initially thought it was the PCM shutting it down when it had air in the block and was heating up, as it did the same thing, but now with the cooling system working, the temp gauge stays on 185, and it still runs sour when warm.

New fuel tank, pump, filter, lines, spart plugs and wires. Injectors are original to the engine, and it did set a couple years in the garage while I built the truck around the 6.0/4L60E combo. VATS disabled, reflashed for 2 02 sensors, which are also orginal ones from the truck engine, in short headpipes off the GTO headers.

I'd like to get it running well enough to limp somewhere to be scanned, as I don't have a diag. scanner, and not stop every couple miles and wait for it to re-start.

Any ideas?

Brian

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Old 04-04-2013, 04:09 PM
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get it to a shop on a hook if needed and scan the history.
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Old 04-04-2013, 06:36 PM
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I'm thinking that may be the route I need to go. I have an enclosed trailer it'll (barely) fit in, and it runs fine long enough to get it in and out of that, so I may have do just that...

Brian
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Old 04-05-2013, 11:27 AM
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The issue turns out to be the (AutoZone replacement) fuel pump. Instead of the 58-60 psi it should develop, it's putting a whopping 5 (that's right, FIVE) psi. No wonder it won't run.

So, out to the shop now to pull the box floor to access the top of the tank and pull the pump. I have a known good GM pump from my wagon, so I'll see if the pump from it will swap into the housing in the trucks tank. If not, I'm buying another pump, but not from the 'Zone...

Brian
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