expy from hell lol p0174 p0171
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Elder User
Joined: May 2004
Posts: 644
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From: GARLAND, TX
expy from hell lol p0174 p0171
Good afternoon All,
Finally i got new cats on my wife's 97 5.4L v8 4x4 expy, however i am getting codes p0174 and p0171 "system too lean on bank 1 and system too lean on bank 2.
I put a new MAF sensor & applied fuel injector cleaner into the tank, however this has not helped at all and engine is still missing...
I changed all 8 spark plugs about 3 weeks ago....
any ideas guys? it's like is loosing power .......and shuts off on me sometimes when i turn AC on.......
Also the pulley tentioner i know is bad cuz is making squicky noises......could that be part of the miss?
Again guys your help is much much appricated thanks a bunch!
Finally i got new cats on my wife's 97 5.4L v8 4x4 expy, however i am getting codes p0174 and p0171 "system too lean on bank 1 and system too lean on bank 2.
I put a new MAF sensor & applied fuel injector cleaner into the tank, however this has not helped at all and engine is still missing...
I changed all 8 spark plugs about 3 weeks ago....
any ideas guys? it's like is loosing power .......and shuts off on me sometimes when i turn AC on.......
Also the pulley tentioner i know is bad cuz is making squicky noises......could that be part of the miss?
Again guys your help is much much appricated thanks a bunch!
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Sometimes the plug comes out of the airbox where the MAF goes. Heard of that causing problems like you describe.
If that isn't it, I would look at a vacuum/air leak as the source of your problem.
If that isn't it, I would look at a vacuum/air leak as the source of your problem.
Junior User
Joined: Feb 2008
Posts: 77
Likes: 0
From: Sticksville, TX
Sounds like someone used cheap universal cats instead of Car Sound (MagnaFlow) or Imco direct fits. Both of those codes are O2 sensor codes from the exhaust. Might be an exhaust leak at the manifolds but sounds more like either a change in the O2Sensor placement or a light load cheap cat.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Sounds like someone used cheap universal cats instead of Car Sound (MagnaFlow) or Imco direct fits. Both of those codes are O2 sensor codes from the exhaust. Might be an exhaust leak at the manifolds but sounds more like either a change in the O2Sensor placement or a light load cheap cat.
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Elder User
Joined: May 2004
Posts: 644
Likes: 0
From: GARLAND, TX
bad bad news....it left me stranded this morning with wife n kids......had to get cab ...go get superduty, then go to autozone and buy fuses then drive back home without it luckely shutting off again....
FUSE # 30 below steering wheel on fuse box keeps popping...what can cause that?
service engine light on ....codes p0171 & p0174 .....
FUSE # 30 below steering wheel on fuse box keeps popping...what can cause that?
service engine light on ....codes p0171 & p0174 .....
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