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Old 07-12-2012, 03:01 PM   #1
Junior Member
Join Date: Jul 2012
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Workhorse with loss of power - intermittent.

P32 workhorse - 2000 chevy 454 7.4L V8

For over a year now I have had issues with an intermittent loss of power. This seems to occur at the 3 hr mark when traveling in hot weather, there is a noticeable difference in heat near the dog house, however the engine temp doesn't change.

On my last trip from Arizona to Colorado - (mostly hills) the coach was running fine and then at approximately 2.5 hrs a loss of power. Doesn't miss fire, rpm's can still be increased with no reaction - an occasional feeling of power, but unable to maintain adequate speed. This only seems to happen after traveling in hot weather. Due to it being Sunday we found an RV park and stayed the night. Next morning coach was fine for about 2.5 hrs then experienced loss of power again. We made it to our destination and decided to leave home at night for cooler temps hoping the motorhome would run fine. No issues while driving in cooler temperature.

I have read a lot of forums with solutions ranging from heat shielding the ECM and possible issues with hot fuel returning to the fuel pump or vapor lock. My mechanic has taken the coach out for two hours with no change in fuel pressure and cannot get issues to repeat. We have changed plugs, wires, distributor, and cleaned the fuel injectors with no resolve - last year when issues first occurred. No codes displayed.

Can anyone shed some light to this issue?
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Old 07-12-2012, 04:18 PM   #2
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Ford Super Duty Owner
Join Date: Jan 2011
Location: Kitts Hill, OH
Posts: 2,221
Maybe the fuel tank vent is part way plugged and running is
Creating a vacume in the tank?
You siad you noticed the dog house got hotter but you also
Noticed the engine didn't get hotter.
I say the engine did get hotter and your dash temp
Gauge is not seeing the higher temps. On my vehicles
Back then there 2 temp sending units. One for dash gauge and
The other for the engine computer. Also on many newer EFI
Engines if you get into a overheat situation the ECM will pull
Back timing and fuel to help cool the engine.
(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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Old 07-13-2012, 08:41 AM   #3
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Workhorse Chassis Owner
Join Date: Mar 2001
Location: Originally from near Portland, OR
Posts: 699
This is probably not your issue but I just had a problem with a partially clogged fuel filter that caused intermittent power reduction. I noticed it when I climbed the Wasatch Mountains out of Salt Lake City in the heat. Replacing the filter seems to have solved the problem.
Doug Sage
Full timers roaming the good old US of A
2007 Itasca Suncruiser 38J
2015 Jeep Cherokee Trailhawk
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Old 07-13-2012, 10:01 AM   #4
"Formerly Diplomat Don"
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Location: Moorpark, Ca.
Posts: 18,750
Does this unit have a catalytic converter? If it does, it may be getting plugged and then cooling off. It would also explain the heat increase.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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power, workhorse

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