I have been trying to get a 1987 F-150 6 cylinder, fuel injected,to run for a few days now....starts hard and runs at low rpm ,even when floored...customer stated it started backfiring and loosing power on the way home one night last week...then slowly lost power till it wont pull its own weight...so far I have checked and replaced all plugs,dropped tank and changed fuel,checked for power and fuel pump operation..(in tank and on frame rail pumps)changed fuel filter,cat converter is long gone,but it runs like the exaust was plugged(Dual cherry bombs) so I cut them off before the muffler just to check to see if thet got plugged....no help at all..also truck seems to heat up real fast ...Possible head gasket???injectors plugged from some bad gas???ignition module not giving enough spark????fuel presure regulator???I am at a standstill and the customer needs his truck for work...any input will be appreciated...Lee
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This is common , the problem will be low fuel pressure due to weak fuel pump. this can be check with a fuel pressure tester, the fuel pressure regulator could be bad, thats located inside the upper intake, and last spider injection system.
A fuel pressure tester can answer and slove this problem, i will bet it is a weak pump, the pump will run the truck but will not start it, sounds crazy but ture, all it takes is about 3 to 4 psi low and it will not start, it may also be a bad pressure leak down valve which is part of the fuelpump, good day
You need a certain amount of fuel pressure to start the truck, the fuel need to flow at a certain pressure to maintain a running engine , the injection system is set up to operate at a certain pressure if to much or to low then it runs bad, the pressure needs to be there to flow and spray all cylinder when needed, if the presssure is low then the injector will open and close so fast that not enough fuel enters the cylinder and thus a not start will occur,these trucks are kown for bad pumps, the fuel drains back into tank and then when you go to start the truck it takes two to four times to start, this is due to a anti flow back valve which is part of the fuelpump internally, try this when starting before cranking the engine turn the key on for 5 sec, then off do this three times then start it, if the truck fires up then you have a bad pump. good day.
Check your running fuel pump pressure. If (as I suspect) it's too low, first try changing your fuel filter. After changing the filter, recheck the running fuel pump pressure. If still low, check you fuel pump pressure regulator. If OK, you may need a new fuel pump.
Also probably would be a good idea to replace you air filter.
whats the fault code in eec when a no start or stall has occured ?
scanners for that year have come down allot it should only cost about 40 bucks and yes they have instructions for operation if you have never used one of these before
untill you know this you could guess all day on causes for this might be as simple as your injection timing is off or costly as injection pump failure untill you know what eec says at time of failure your only guessing!
SOUND LIKE THE ELECTRIC LOW PRESSURE FUEL PUMP CHECK FUSE TO SEE IF PUMP GETTING POWER. IF NOT REPLACE FUSE AND CHECK THE WIRE TO PUMP.IF PUMP IS GETTING POWER..REPLACE FUEL FILTER FIRST.IF IT DONT HELP.COULD BE THE ELECTRIC LOW PRESSURE PUMP. FAULTY. IT PUMPS DIESEL FUEL IT INTO INJECTION PUMP TO BE PRESSURIZED TIMED AND INJECT.SEE IF LOW PRESSURE PUMP DONT WORK THE WHOLE ENGINE WONT RUN.THE INJECTION PUMP NEED FUEL FROM LOW PRESSURE ELECTRIC PUMP TO RUN ENGINE.