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I have the lean codes again. Both banks. I was on the way to a friends apartment and it went on.
P0174 and P0171
I've gone through this for the 'n'th time now. I've replaced egr gasket, IAC, and IAC gasket, The TB gasket, All the clamps were redone. New plugs are in and have been running find for about 2 months. I have no clue on how I keep getting lean codes in both banks. Is it at all possible that both O2s are bad?
1998 SE Duratec V6 ATX
Ebay intake with K&N Filter
Trubendz Exhaust
Custom Hood
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Originally posted by ZeroHour:
... Is it at all possible that both O2s are bad?
Probably not. I would check for vacuum leaks first (air filter housing, UIM/LIM, exhaust, etc.)
Per TSB,
P0171 - System Too Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code is set when the adaptive fuel tables reach a rich calibrated limit.
Fuel System:
�· Contaminated fuel injectors
�· Low fuel pressure or running out of fuel (fuel pump, filter, fuel supply line restrictions)
�· Vapor recovery system (VMV)
Induction System:
�· MAF contamination
�· Air leaks between the MAF and throttle body
�· Vacuum leaks
�· PCV system concern
�· Improperly seated engine oil dipstick
EGR System:
�· Leaking gasket
�· Stuck EGR valve
�· Leaking diaphragm or EVR
Base Engine:
�· Exhaust leaks before or near the HO2S
�· Secondary air concern
Powertrain Control System:
�· PCM concern
P0174 - System Too Lean (Bank 2) Same as DTC P0171, but Bank 2. See Possible Causes for DTC P0171
Last edited by Tony2005; 03/05/06 04:37 AM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Could it be the upper and lower intake manifold gaskets? I believe I had the same codes and that is what mine ended up being. Had nothing to do with the o2 sesnors. 
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meh I was thinking that myself, but I don't want to pull the intake manifolds apart right now. But my car is really acting up. I noticed today I only went 145 miles and I'm on quarter tank. I really hope the PCM isn't dumping in fuel because its too lean. Cause then I'll be buying headers...
1998 SE Duratec V6 ATX
Ebay intake with K&N Filter
Trubendz Exhaust
Custom Hood
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Joined: Jun 2001
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I had the same problem. I was going thru ALOT of gas. Now that I got the intake manifold gaskets taken care of (and the DPFE sensor that was also causing the CEL) my gas mileage has gone up dramatically. (can't count this week cause of the snow  )
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You know before I thought it might be the DFPE and alot of people were telling me it might not been and don't change it. That was when I went through and redid my intake and replaced the IAC, which was wearing out. Maybe it was the DFPE all along, because if the IAC has been trying to compensate for a failing emission system It would have been over worked. lol I don't mind fixing the parts or spending the money. I just want to fix the problem!
and last night since I couldn't sleep I laid awake thinking.
How can you test the working of the EGR valve? Would a disfunctional EGR make the car lean and or stall? Its probably on the site, but I have classes in 10 minutes and won't be back till 2:30, and I know you guys will be crusing the site while you're at work and such. lol Thanks in Advance.
currently possiblies list:
-Intake Gaskets(manifolds)
-DFPE sensor
-EGR valve itself.
counted out:
-IAC
-intake leaks besides manifolds
-Battery, plugs, wires are all new
1998 SE Duratec V6 ATX
Ebay intake with K&N Filter
Trubendz Exhaust
Custom Hood
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Like magic: "EGR TEST" search termsapply vacuum to the top of the egr in the first step, follow the directions as it says.
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Thanks Ray.
I can't wait to get home friday to start fixing things. I'm going to check the EGR to see if its working.
Also I read down that post and it said to unplug the MAF sensor? isn't that bad? Or does the computer drop the to a default to keep the car running?
Another Q, How do you replace the EGR valve? Does it come off the header with the pipe? Or does the pipe stay on, and the egr come off?
1998 SE Duratec V6 ATX
Ebay intake with K&N Filter
Trubendz Exhaust
Custom Hood
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Do you have an after market filter on it? I know I got that code when I put a freshly cleaned and re-oiled K&N on my wifes car. After a few months the code showed up and I was getting pinging under hard acceleration. I cleaned the MAF put the old paper filter back in and didn't get that code again. But around the same time I was also getting the EGR code and changed out the DFPE. If your DFPE sensor isn't functioning right you should have the excessive flow code. Still haven't heard of someones EGR actually stop working it has always been the DFPE. Good luck.
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Originally posted by ZeroHour:
...
Another Q, How do you replace the EGR valve? Does it come off the header with the pipe? Or does the pipe stay on, and the egr come off?
Remove two bolts on to the intake manifold, then a tube nut to the tube. The tube should "stand" on its own after removing the EGR valve.
The other end of the tube is connected to the exhaust manifold on top of the Bank 1 Pre-cat. Don't mess with it.
Edit. In this link, you should be able to see the tube nut just below the hose clamp for the 45 degree bend IAC hose.
http://img39.imageshack.us/my.php?image=airplenum20ry.jpg
Last edited by Tony2005; 03/07/06 09:54 PM.
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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