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Old 06-29-2012, 11:55 PM   #1
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Ford 460 EFI - E350 29 foot motorhome

I've read a few comments about ford 460 engines ceasing when running on very hot days. I've had this experience - running into Butte Montana with my 1995 460 EFI engine 29 foot motorhome. Coming up a steady steep grade in 95 degree weather, we topped the pass and headed down into Butte and about 3 miles from the city the engine just quit. I had to wait an hour for it to cool. It was either a vapor lock or the tank was down to less than a 1/8 full and the engine was just fuel starved - though I was able to start and continue after waiting an hour. I phoned the ford dealer in Butte and they thought the oil pan filter was plugged and that at worst I might have to replace the engine (so they said!). I think it was both low fuel starvation and a very hot engine - possibly a vapor lock.
Has anybody else had a similar or related event?
On another note, any suggestions about improving fuel economy and power. I've read several web sites and there are mixed reviews about chips verses advancing the base timing a few degrees or increasing air intake and exhaust output. Any comments advice here? Thank - David

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Old 06-30-2012, 05:23 AM   #2
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Welcome Jabu to irv2.
My old 460 88 GB had problems with the manifolds popping bolts and replaced with headers and Banks exhaust system no improvement on mileage but more guts in drive train.
The 96 Fords had problems with the fuel pump failing on hot days and as you are doing waiting on side of road for cool down would allow continued driving or a new fresh tank of cool gasoline would get you moving. Than it may not happen for a few 100 miles again.
I have change the fuel filter on road also.
You may have one of those faulty fuel pumps if your chassis was in the transition year 95-96.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
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Old 06-30-2012, 06:45 AM   #3
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e f i can't vapor lock it is a high pressured system not like carburetors and if it restarted with out adding fuel to the tank it didn't fuel starve.
possible the fuel pump got hot but it could also be your oil pressure sensor is going bad and the ecm though you lost oil pressure.
some rigs run one sensor that runs the gauge/ light some run two sensors.with it having to set and cool i would guess and oil pressure senor or a crank or cam sensor getting hot ran into this on a friends rig took us forever to figure out it was a new part that went bad'
make sure they to check them hot put them under a heat lamp or other source of heat as they will read good until they are at 220 degrees or above,when they cool they are back in spec and will let the engine run again
don't let the dealers/shop bully you into expensive repairs you don't need
good luck
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Old 07-01-2012, 02:41 PM   #4
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Ford 460 stall

Thanks pwf16129! Good suggestions - appreciate you taking time to reply! I'll check out the two items.
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