1996 runs about 90 seconds smoothers out

Asked by GuruHT429 Jul 09, 2019 at 08:06 PM about the 1996 Ford F-150 XLT Extended Cab LB

Question type: General

My husband has a 1996 f150 5.0 xlt
Starts runs about 90 seconds the
goes dead like it smoothers out
Replaced the following
Spark plugs
Spark plug wires
Mass air flow sensors
Air filter
Fuel pumps
Fuel filter
Heat sensor
Crank shaft sensor
Ignition module
Fuel pressure regulator
PCV valve
Fuse relay
Distributor cap & rotor

1 Answer


well, to be honest with you, if it was running just fine for 90, you probably didn't need to replace the plugs/wires. Running the motor was already established. I have this same exact pick up truck and the fuel pump would be the last thing I would check on ( because when you hear it hum at the turn of the key, it is getting juice but it doesn't take 12 volts to run). I would focus more on the fuel pump relay if it starts and runs fine but dies out. you will see 6 of them in the panel, only 5 are plugged in and you have a spare. I would get a cigar cleaner from a smoke shop and clean out my MAF sensor to keep that part clean. If the computer cannot read air properly, how does the computer know what to tell the gas pump how much gas to bring to the motor for proper 14:7:1 combustion?? I got rid of my oil based air filter and switch to STP fiber. never looked back. good luck

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