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  #1  
Old 07-17-2011, 06:52 AM
chris29 chris29 is offline
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Unhappy 1998 2.5 error code p0171

ok im just trying to save some money by not taking it to the shop. At first it wasn't that bad . It was just idling erratically, lack of power especially going up hill , when you turn a/c on it idle a little weird.
this is what ive done to the truck so far. new o2 sensors , dpfe sensor,
plugs plug wires. Now that i drove for a while the symptoms are getting worse. truck is very hard to start . hardly any power. PLEASE I NEED HELP!
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  #2  
Old 07-18-2011, 10:37 AM
modelageek modelageek is offline
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Default Re: 1998 2.5 error code p0171

Quote:
Originally Posted by chris29 View Post
ok im just trying to save some money by not taking it to the shop. At first it wasn't that bad . It was just idling erratically, lack of power especially going up hill , when you turn a/c on it idle a little weird.
this is what ive done to the truck so far. new o2 sensors , dpfe sensor,
plugs plug wires. Now that i drove for a while the symptoms are getting worse. truck is very hard to start . hardly any power. PLEASE I NEED HELP!
here read this..........http://www.obd-codes.com/p0171

do you have an oiled air filter?
have you changed the fuel filter?
clean MAF?
did you look for vacuum leaks?
make sure air filter and intake is clear and clean
what is your fuel pressure?
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

Last edited by modelageek; 07-18-2011 at 10:40 AM.
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  #3  
Old 07-20-2011, 03:59 PM
chris29 chris29 is offline
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Default Re: 1998 2.5 error code p0171

i replaced air filter
new fuel filter
new mass air flow
no vaccuum leaks
however when i changed the fule filter , i went to bleed the fuel pressure . I found that there wasn't hardly any . i'm now in the belief that its the fuel pump. because soon as i changed the maf sensor it would not run at all . that's when i changed the fuel filter . That made it a lil better what do you think?
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Old 07-20-2011, 08:39 PM
S13minus1 S13minus1 is offline
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Default Re: 1998 2.5 error code p0171

rent a fuel pressure guage from autozone. screw it on. run a koeo and koer test of fuel pressure. consult specifications.
basically the truck is seeing too much oxygen content in the exhaust than it should per that load cell (based on inj. on time, maf, throttle position, etc)
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'10 Ranger XL 2.3L Manual
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  #5  
Old 07-21-2011, 04:06 AM
modelageek modelageek is offline
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Default Re: 1998 2.5 error code p0171

Quote:
Originally Posted by S13minus1 View Post
rent a fuel pressure guage from autozone. screw it on. run a koeo and koer test of fuel pressure. consult specifications.
basically the truck is seeing too much oxygen content in the exhaust than it should per that load cell (based on inj. on time, maf, throttle position, etc)
I agree with him^^^^^^^^^...if you do replace the pump it is easier for the DIY selfer to pull the Bed then drop the tank......
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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