5.4 loses power after several miles
#1
5.4 loses power after several miles
I have a 2006 F250 with the 5.4 with 182k miles and I'm stumped. The truck idles fine but after driving for a while it suddenly stops accelerating right...giving it more gas just makes it slow and even backfire. If I shut it off and restart it I get full power for several more miles. It is giving codes 171, 174, 191, and 2006. It has a new MAF sensor, fpcm, air filter, ran fuel injector cleaner through, plugs look good. Yesterday I went 60 miles before it started acting up. So frustrated. Any ideas? Thinking maybe junk in the gas tank or something? Should note it starts at random times and speeds but will get worse until I can't maintain speed and have to restart it. Also should note it has a bad exhaust maifold giving codes 420 and 430, too so I don't think it is the cats or something like that.
Last edited by dodgeboy11; 04-26-2015 at 02:30 PM.
#2
Senior Member
Do you have to wait a while after you shut if off like time enough for something to cool down or are you able to basically stop and then restart and it's OK for a while? Sounds like a fuel system problem to me, fuel filter but not familiar with the vehicle so do not know if there is an inline filter or just the "sock" in the tank. Maybe something else is causing a reduced fuel flow over time.
#3
Senior Member
Sounds like the way mine was acting.
https://www.f150forum.com/f4/06-5-4-...-fires-291476/
This catalytic converter has two sections in it. The forward chunks break up and move around to clog the ports in the second section.
https://www.f150forum.com/f4/06-5-4-...-fires-291476/
This catalytic converter has two sections in it. The forward chunks break up and move around to clog the ports in the second section.
#4
Do you have to wait a while after you shut if off like time enough for something to cool down or are you able to basically stop and then restart and it's OK for a while? Sounds like a fuel system problem to me, fuel filter but not familiar with the vehicle so do not know if there is an inline filter or just the "sock" in the tank. Maybe something else is causing a reduced fuel flow over time.
#5
Sounds like the way mine was acting.
https://www.f150forum.com/f4/06-5-4-...-fires-291476/
This catalytic converter has two sections in it. The forward chunks break up and move around to clog the ports in the second section.
https://www.f150forum.com/f4/06-5-4-...-fires-291476/
This catalytic converter has two sections in it. The forward chunks break up and move around to clog the ports in the second section.
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#8
Senior Member
My truck recently started hesitating under acceleration and it was the fuel filter. When blowing backwards through the old filter, the restriction was obvious and a bunch of brown sludgy crap came out.