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5.4L running like crap!! HELP

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Old 12-10-2018, 07:25 PM
tuekwik
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5.4L running like crap!! HELP

My 2000 Ford F250 with a 5.4L gas engine is running like crap after changing out the fuel filter. It starts, idles at about 800 rpm. Runs and drives but has no power, it actually sounds like it has an exhaust leak when I hit the gas.... pulled codes off it. P0171, P0174 and P1131. Looked them up but so many could be's. Would appreciate any help. Thanks
 
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Old 12-10-2018, 10:11 PM
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No fuel? filter in correctly.. Bad filter? geez. I would get another good! filter before I went to far or spent too much $$$.
 
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Old 12-10-2018, 11:40 PM
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Tank is full, Yes, filter in the right way, arrow pointing towards the motor. Those three codes point to the engine running lean due to a possible vacuum leak somewhere???? Cleaned MAF sensor and IAC valve too.
 
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Old 12-11-2018, 01:00 AM
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Ya butttt. Gotta be related to changing the filter doesn't it. Or did you have issues before you changed it.
 
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Old 12-11-2018, 09:19 AM
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Is it leaking fuel by the filter now? I'd reinstall the filter, and check for leaks. Maybe it's sucking air, or maybe the filter isn't right. Seems like if you didn't have the problem before, then you should get a different filter and try that first.
 
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Old 12-11-2018, 10:02 AM
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It was not running the smoothest when I replaced filter. I only replaced it thinking it would run better.
 
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Old 12-11-2018, 11:07 AM
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Worked on it this morning, erased the codes, took it for a drive. Still running crappy, now it's only coming up with one code, P1131, HO2S sensor trying to correct for an over-lean condition. That code means that it's a bad sensor???
 
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Old 12-11-2018, 11:09 AM
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Well you're running lean according to the codes. Have you checked your fuel pressure? Possible the fuel pump is dying. Lots of people complain of no power when they start to die. Also, I can't remember if the older 5.4s have any valve timing adjustment going on, but any noise you're hearing may be that if they do.

Get someone to test your fuel pressure IMO.
 
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Old 12-11-2018, 05:01 PM
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Originally Posted by tuekwik View Post
My 2000 Ford F250 with a 5.4L gas engine is running like crap after changing out the fuel filter. It starts, idles at about 800 rpm. Runs and drives but has no power, it actually sounds like it has an exhaust leak when I hit the gas.... pulled codes off it. P0171, P0174 and P1131. Looked them up but so many could be's. Would appreciate any help. Thanks
are you saying it was running fine before the fuel filter change?
why did you change the fuel filter?
how many miles on the engine?
what about the air filter? is the MAF clean?

definitely check the fuel pressure
 
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Old 12-11-2018, 06:40 PM
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Go back over everything and see if a vacuum hose came off, or has a crack or tear.
 
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Old 12-11-2018, 08:43 PM
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According to a mechanic, he said pressure on the fuel rail is within limits
 
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Old 12-11-2018, 08:46 PM
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Originally Posted by speakerfritz View Post
are you saying it was running fine before the fuel filter change?
why did you change the fuel filter?
how many miles on the engine?
what about the air filter? is the MAF clean?

definitely check the fuel pressure
It was not running smooth before changing out the filter
I changed it thinking it would help it idle better
224k miles
New air cleaner and MAF was cleaned.
 
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Old 12-11-2018, 08:47 PM
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Originally Posted by redford View Post
Go back over everything and see if a vacuum hose came off, or has a crack or tear.
Checked all visible lines, did a smoke test on it. Didn't find a leak.
 
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Old 12-11-2018, 08:50 PM
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Could it be my spark plugs that are not up to par? Or the coils? I heard that the spark plugs on these 5.4's are a pain in the a$$
 
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Old 12-12-2018, 08:35 AM
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If it were plugs or coils you'd be getting misfire codes most likely.

Did he only test the fuel pressure while idling? I've heard of people who get fair pressure while sitting but once they get rolling and using the fuel that a failing pump can't maintain pressure. Not sure how often or true that is.
 

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