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Help with CEL please
Ok I have two codes coming up on my 97 with the 5.4. p0171 and p0174.
fuel bank 1 and 2 too lean. I cant figure this out at all. I have replaced the MAF sensor, fuel filter and spark plugs. all cylinders are firing ( unplugged each coil while it was running) and it still runs like its missing a cylinder. Anyone have any ideas? Thanks in advance |
check for a vacuum leak. especially the pcv elbow on the back of the intake. they are the most common reason for those codes.
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https://www.f150online.com/forums/v8...ions-list.html
check this thread. gives you a little info that might be helpfull also. |
Thanks alot. I'll pull it back into the garage tomorrow and see what I can come up with.
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Originally Posted by 05crewzer
(Post 3668015)
https://www.f150online.com/forums/v8...ions-list.html
check this thread. gives you a little info that might be helpfull also. |
Originally Posted by Matts ford
(Post 3668033)
you actually had enough patience to read all that? i opened it and just said no and clicked out of it:lol:
but i knew it would help someone with problems with the same code. so heres my good deed for the day:beers: hoped that helped you cheezy. |
Originally Posted by 05crewzer
(Post 3668125)
thats funny because i didnt read any further that po171......... and remembered that when this post came up. it didnt affect me so i past it.
but i knew it would help someone with problems with the same code. so heres my good deed for the day:beers: hoped that helped you cheezy. |
When both banks test positive for lean, the most common problem is pin-holes or a tear in the PCV elbow that connects to the manifold back by the firewall.
https://www.f150online.com/galleries...940-216480.jpg https://www.f150online.com/galleries...940-199109.jpg |
awsome, thanks a bunch.
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kinda think jbrew knows what hes talking about. i would check that first
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Originally Posted by 05crewzer
(Post 3668206)
kinda think jbrew knows what hes talking about. i would check that first
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Yea, service says to clean the MAF first, but it's usually the elbow. I would do both, - Clean the MAF if you haven't already and check the elbow. Any leaks in both PCV system and Air Intake system cause unmetered air. The PCM sees as lean resulting in the 71 and 74 DTC's.
There's other problems that could cause these codes - Like a dirty fuel filter or failing fuel pump, but it's usually the first one mentioned. |
Originally Posted by jbrew
(Post 3668239)
Yea, service says to clean the MAF first, but it's usually the elbow. I would do both, - Clean the MAF if you haven't already and check the elbow. Any leaks in both PCV system and Air Intake system cause unmetered air. The PCM sees as lean resulting in the 71 and 74 DTC's.
There's other problems that could cause these codes - Like a dirty fuel filter or failing fuel pump, but it's usually the first one mentioned. |
Aftermarket MAF may not have the right calibration.
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Originally Posted by cheezeonmakneez
(Post 3668255)
well I just put a new MAF sensor and fuel filter on over this last week. I'm hoping to find vac leak.
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