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1991 F250 7.5l EFI loss of power under demand

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1991 F250 7.5l EFI loss of power under demand

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Old 11-04-2009, 05:33 PM
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Join Date: Nov 2009
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Default 1991 F250 7.5l EFI loss of power under demand

Pulling a grade yesterday and lost power big time , nothing over 2500 RPM .

Even when I limped too the top of the grade onto level ground .

Only after I babied it home cooled it with water over the radiator , turned it

off and let it set 10 minutes . Then fired it up and revved it a couple of times

did it finally kick up past 4K RPM . Question ; O2 , MAP sensors injectors

or fuel filter or pump ?. Where would you start to look for the problem ?.

Truck was warmer than normal when running

extremely dry air 7-9 % humidity but never got close to boiling over . it's

normal temp position is between cold and half , yesterday it was half way straight up .

Thanks Luggingalong
 
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