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Thread: Ford Techs please.
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10-26-2006, 03:53 PM #1
Ford Techs please.
'99 Ranger XLT 4 wh dr 4.0 (single cam) V-6 w/check engine light on.
Codes are:
DTC P0171
System Too Lean
(Bank 1)
and
DTC P0174
System Too Lean
(Bank 2)
The "experts" at Auto Zone said:
It's one or more of the four different O2 sensors, the mass air flow sensor or a fuel pump
Gee, thanks for narrowing it down for me!
Any suggestions guys? About 104K runs like a top and light just came on this morning. I have my own code reader here but am sure it will say same thing.
Can it be lean enough to do damage until I figure out whats going on??
Oh yeah, the "expert" at the parts store was nice enough to print off all the possible defective parts for me.
With both side being lean I'm gonna guess MAS?
As always, thanx a million guys!
Gary
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10-26-2006, 03:58 PM #2
Test fuel pressure!
Fuel pump or pressure regulator seems to be the problem.
By the year it's almost time for new electric pump!
Auto Zone loves selling those O2 Sensors!“The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”
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10-26-2006, 03:59 PM #3
MASS air flow sensor has a major fault code. It has a self test.
I don't see the OB2 missing it.
Al“The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”
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10-26-2006, 04:06 PM #4
Gary, I did find this:
Some vehicles may exhibit a check engine light on and lean Diagnostic Trouble Codes (DTC's) P0171/P0174 (system too lean bank 1 or 2) stored in memory.
Do not replace PCM (Powertrain Control Module), MAF (Mass Air Flow), or HEGOs (Heated Oxygen Sensors), as these parts are not the root cause of the lean codes conditions described.
These conditions may be caused by a loose fitting on the fuel pressure regulator vacuum line on the intake manifold end and/or leaking isolator bolts/port gaskets in the lower to upper intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.
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10-26-2006, 04:10 PM #5Originally Posted by Scream And Fly“The bitterness of poor quality & service remains long after the sweetness of low price is forgotten”
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10-26-2006, 05:06 PM #6
You guys rock!!
I freagin love this site! Car questions, stereo questions ...it just doesn't matter!
Greg, where'd you find that?? Will trouble shoot this weekend.
Al, Thank You Sir!
P.S., Greg I'm thinking I need some pixs of my boat runnin. Think you can help a brother out?
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10-26-2006, 05:09 PM #7
Gary, I Googled it and came across that - I'll see if I can find where I got it (I should have bookmarked it).
Photos are no problem at all - sounds like a great idea!
Greg
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10-26-2006, 05:14 PM #8
Maybe we can work something out the RR?
Will you and Maureen have shirts and stickers there??
Thats all I needed to know about your Ford info. Was just curious where the info came from.
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10-26-2006, 05:20 PM #9
Unfortunately, it looks like I won't be at the River Ranch. It's looking like I'll have to cover the OSS race in Destin that weekend. Maureen will be at the RR though, and she'll have shirts and goodies.
I still may be able to make it to the River Ranch (I hope), but we'll see...
Greg
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10-26-2006, 05:25 PM #10
Really....
Originally Posted by Scream And Fly
Tonys coming down too but flying his plane down.
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10-26-2006, 05:26 PM #11
Believe me, I want to go - badly. The River Ranch is an amazing event, and this one will be huge. I'm hoping...
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10-26-2006, 06:22 PM #12
From what I've read and heard...
Originally Posted by Scream And Fly
The makings of one of the really special events. Great guys running the show.
Gary
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10-26-2006, 06:30 PM #135000 RPM
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I had those codes on a 97 4.0 ranger a few years ago. Turned out to be an intake leak.
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10-26-2006, 06:34 PM #14
Interesting.
Originally Posted by SteveO
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10-26-2006, 07:55 PM #15Screaming And Flying!
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Mass air sensor on air horn has to star type screws mark if not marked and count turns out lift out sensor and see if there is any dust dirt, a little will cause the light to be on. They make a cleaner spray it and the base. put the screw back in disconnect battery 45 minutes connect and see if light returns. Rick
if that does not work take to cold beers and put tape over the light