1992 f150 4x4 5.0 (running bad after engine warms up)

265

Asked by Apr 08, 2014 at 11:31 AM about the 1992 Ford F-150 XLT Lariat 4WD LB

Question type: Maintenance & Repair

I recently bought a 1992 ford f150 4x4 5.0 This truck runs like a top near perfect for about
10 -15 minutes at first start up when motor is cold but as it warms up engine temp that is
is has a lot of hesitation,chugging and missfiring also sometimes dying at a stop light
always starts right back up and idles fine while in park or neutral at startup and while
warm though. Please Help Thanks....

3 Answers

265

This is a 5.0 electronic fuel injection motor with true duals.The truck also has a slightly high idle but when reving the motor in park it doesn't miss at all only misses while driving. could this be timing related? I have changed the fuel filter,plug wires,cleaned the cap and rotor and took ignition module to a o'reily's store where i had it tested and the ignition module passed. Any help would be greatfully appreciated. Thanks

7 of 7 people found this helpful.
45

Fuel sending unit....Had the same problem with my 1994 f150 5.0 dual tanks. My front tank pumped fuel just fine, idled fine, drove fine for first 10 mins. But when engine warmed up the truck would just bog down when I hit the gas. Found out that when fuel sending units go bad, the circuit will have a resistance issue. The fuel temp goes up after driving for a little bit which starts the resistance issues in the circuit. The fuel pump and the fuel sending unit are two separate things, but are attached to each other. When the fuel pump is bad the engine won't start. When the fuel sending unit is bad the engines Boggs down after it warms up. I had a code 542, bad ground. At first I thought it was a broken or chafed wire, but it was the sending unit. Oh yea my fuel gauge was stuck on FULL all the time before the fuel sending unit replacement, now it reads normal. I learned everything on YouTube, from guys like Eric the car guy, Scanner Danner, and a bunch of others. I learned how to pull the codes on an odb1 system, test the fuel sending unit Before dropping the tank, how to drop the tank The Easy way, clean the tank (very important, don't drop in a new fuel unit in a dirty gas tank useless your into throwing money away!) use Apple cider vinegar, it works the best and it's cheap, no joke. I hope this info. Helps.... I sent a couple of days researching on YouTube, once a lot of people where saying the same things, I then knew they were telling the truth. Just YouTube it! Now I'm learning how to weld my own Duals and convert the rear end to Posi.

4 of 4 people found this helpful.
735

Check for codes then get back to us.

2 of 2 people found this helpful.

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