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Old 04-06-2014, 07:57 AM
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diagnosis help requested!

2001 7.3 stick-shift

Under heavy load (trailer) or hard acceleration, truck will shudder and lose power, like cylinders are going away one by one. It will idle rough, then smooth out after a minute or so, then run right until you load it up again. Starts and idles fine though. Sometimes the EGTs go through the roof, and sometimes its showing like 350 and dropping, as though there is no fuel at all on that side of the engine. No check engine light, and no codes. But no power either. Seems to run ok as along as I dont push it or load it up. Maybe truck is just getting lazy and doesnt want to work anymore.

I have a DPTuner, but it doesnt matter what program its in, stock etc, behaves the same.

Im thinking valve cover wiring?

Any suggestions would be appreciated.
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Old 04-06-2014, 08:34 AM
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id disconnect DP and go from there. Check the ICP for oil in cap, also
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Old 04-06-2014, 09:18 AM
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With "No Codes" I'd be looking at Fuel Delivery (wiring & sensors would set the light)

Fuel Filter?
Pump?
Screens in Tank clogged?

Get a pressure gauge on it (something you can read while driving) and go see if you can make it happen while monitoring Fuel Pressure (maybe just throw a filter in first and see what happens)
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Old 04-07-2014, 11:55 AM
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+1 for checking fuel pressure. Get a gauge on it and see where its at.
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Old 04-07-2014, 01:00 PM
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Im thinking I need a fuel pressure gauge in the cab on this thing. I think I have found my problem - my additional fuel filter was totally gunked with nasty stuff, like that black oil thing from X-Files had defecated in my fuel tank. I think if I had a fuel pressure gauge, I would have seen it dropping when pulling a trailer hard up a hill.
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Old 04-07-2014, 02:58 PM
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Oil in the fuel bowl usually points to failing injector O-rings. How many miles are on your truck?
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Old 04-08-2014, 06:50 AM
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Quote:
Originally Posted by Peter@DP-Tuner View Post
Oil in the fuel bowl usually points to failing injector O-rings. How many miles are on your truck?
There's no oil in the bowl. I added an extra filter years ago upstream of the fuel pump (it also has a regulated return kit on it). That filter was nasty with goo. I changed the filter, and I *think* I'm back in operation. The truck has ~165K on it. It does not use any appreciable amount of oil, maybe a quart in between 5K oil changes.

I think I got some gummed up fuel somewhere along the way that clogged the aux filter.

Thanks for all the suggestions....
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