5.0 problem clueless
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5.0 problem clueless
93 f150 5.0 sometimes tough starting cold sometimes starts on 1st try runs fine around town and on highway normal everything if i put it under load pulling boat hauling or plowing (with plow not blocking radiator ) it has no power and overheats has 3.55 gears changed plugs with motorcraft wires rotor cap replaced fuel filter replaced air filter with k&n replaced o2 sensor gutted cats completely removed resonator has flowmaster muffler doesnt appear to use antifreeze radiator full no check engine light .doesnt have a miss idles fine had tranny rebuilt 15,000 miles ago lost reverse truck has had this problem since i have owned also has newer water pump .
any ideas i am clueless mechanics i talked to recommended problem either clogged fuel filter or clogged cat neither of which was the problem plugs looked decent when changed not fouled and not charred white .
any ideas i am clueless mechanics i talked to recommended problem either clogged fuel filter or clogged cat neither of which was the problem plugs looked decent when changed not fouled and not charred white .
Senior User
Joined: Nov 2006
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From: On a farm in Alberta.
wheres is your o2 sensor located on ur exhaust, befor or after your cat? how many miles are on the truck too?are your injectors clean, might just have a clogged injector. get your injectors/fuelrails/lines all flushed, could be that... or have you tried the throttle position sensor? mine when out on my truck and it was doin the same.
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02 sensor is located just after y pipe and before cats exc. this is the only o2 sensor truck has 128,000 miles on it have not gotten into sensors new technology i guess did some research on how to pull codes may try that tomorrow
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From: On a farm in Alberta.
yeah pull some codes up through a diagnostics... if the o2 sensor was after the cat that woulda been your problem... could be the EGR sensor, or purge canister... sounds something electronic
Fleet Mechanic
Joined: Nov 2004
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From: Michigan
Overheating and loss of power. Have you flushed the cooling system lately? You say "newer water pump", but how's the radiator or thermostat? You may not leak any coolant, but a radiator can go bad by being plugged.
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From: youngstown ohio
i would try some seafoam and pull the codes. Seafoam is a carb/crankcase/whatever cleaner. Id use like half can to quarter tank gas runout or down put rest in to whatever gas u put in and see if inproves.
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From: Ottawa, Ontario
Originally Posted by ninetythreef150
pulled fuel pressure 30 lbs at idle and 29-28 as you floor it
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Should be higher than that too....40-45ish.
If you havn't changed the fuel filter in a long time, that's probably what it is.
Don't drive it like that until you fix it because you're probably running it lean.
If you havn't changed the fuel filter in a long time, that's probably what it is.
Don't drive it like that until you fix it because you're probably running it lean.
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found problem was fuel pressure related 1 st changed filter pressure came up 30 at idle and when revved up went up to 40 ran good for a little while then a half a tank later same problem started running like a dog checked fuel pressure sometimes it went up from idle sometimes it dropped .Problem ended up being fuel pressure regulator only thing i can figure is when i removed the filter it took all the pressure off the fuel line and regulators spring/ diaphram which caused it to work right for a little while then crap out again .replaced regualtor and now runs like a raped ape .thought i would post this since it seemed to be a goofy problem masked by changing the fuel filter .
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