Help with CEL please
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Junior Member
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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
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
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From: SugarLand
https://www.f150online.com/forums/v8...ions-list.html
check this thread. gives you a little info that might be helpfull also.
check this thread. gives you a little info that might be helpfull also.
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Joined: Nov 2007
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From: whaleyville, MD
https://www.f150online.com/forums/v8...ions-list.html
check this thread. gives you a little info that might be helpfull also.
check this thread. gives you a little info that might be helpfull also.
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Joined: Jan 2009
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From: SugarLand
but i knew it would help someone with problems with the same code. so heres my good deed for the day
hoped that helped you cheezy.
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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
hoped that helped you cheezy.
but i knew it would help someone with problems with the same code. so heres my good deed for the day
hoped that helped you cheezy.
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Technical Article Contributor
Joined: Oct 2005
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From: MI
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.
Last edited by jbrew; Apr 3, 2009 at 10:32 PM. Reason: pics
Technical Article Contributor
Joined: Oct 2005
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From: MI
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.
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.
Thread Starter
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Junior Member
Joined: Feb 2009
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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.
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.
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
What is she idling at ? Above 750 RPM's ? Is it loopy ?