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ERROR CODE P0171 CAN'T FIX & CLUELESS!

 
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  • 1 Post By sanatanadharma
  • 1 Post By heifetz17
  • 1 Post By sanatanadharma

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  #1 (permalink)  
Old 16 Aug 2013, 12:53 pm
Fresh Cruiser
 
Join Date: Aug 2011
Location: Denver, CO
Posts: 3
Default ERROR CODE P0171 CAN'T FIX & CLUELESS!

Hello everyone,

My Cruiser is original 2001 with 220,000 miles. I have taken excellent care of it through the years. I have had a check engine light for at least 3 years that produces the a 0171 lean code ERROR CODE. I have thrown too many parts to this problem. Thinking the problem could be caused by erratic engine temperature I replaced the coolant system and the car runs dead middle guage. Thinking there may have been a vacuum leak in the upper intake manifold I changed that out and cleaned the EGR tube. Still nothing???? Change both oxygen sensors. I did take to a mechanic and they said it was a loose Maf wire and "Fixed it" well the light came back on with the same code. I even changed the sensor. So here is a list of parts and work performed.

Replaced both 02 SENSORS
Replaced upper intake plenum gaskets
change the MAF Sensor
PCV Hose replaced
cleaned and tightened EGR Tube
New wires
New plugs
New ECT Sensor
New thermostat
Checked vacuum hoses for cracks visually and with carb spray
Replaced the Upper intake manifold Plenum.
New Radiator
New radiator Fan

I have run the Tourque app on the car while running. and have the following information:

LTFT: 10.2 -24.2 fluctuates @ 2rpm
02 sensor 1 volts .5-.7
02 sensor 2 volts.8
STFT 3.4

I am completely out of answers here? Can anyone help? I have not tried any fuel testing yet. Any ideas?

Thanks and use the forum!
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Old 16 Aug 2013, 01:13 pm
Veteran Cruiser
 
Join Date: Sep 2010
Location: Walking distance to the embassy
Posts: 3,020
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Crack in the exhaust manifold allowing air to suck in and confuse the O2 sensors?
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Old 16 Aug 2013, 05:53 pm
Fanatic Cruiser
 
Join Date: Mar 2010
Location: Billings, MT
Posts: 745
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Below are the only reasons this code would come on. Hopefully one or more of them help you:

*FUEL FILTER/PRESSURE REGULATOR (LOW)
*INTERMITTENT FUEL SYSTEM DTC
*RESTRICTED FUEL SUPPLY LINE
*O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP
*O2 SENSOR GROUND CIRCUIT VOLTAGE DROP
*O2 SENSOR
*TPS VOLTAGE CHANGE NOT SMOOTH
*TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
*FUEL PUMP INLET STRAINER PLUGGED
*FUEL PUMP MODULE
*CHECKING ECT SENSOR
*ENGINE MECHANICAL PROBLEM
*ECT WIRING HARNESS INTERMITTENT
*MAP SENSOR (OUT OF CALIBRATION)
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2010 PT Cruiser Classic, Deep Water Blue
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Old 16 Aug 2013, 06:20 pm
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Join Date: Sep 2001
Posts: 27,743
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Welcome back Chris.
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Old 16 Aug 2013, 06:31 pm
Veteran Cruiser
 
Join Date: Sep 2010
Location: Walking distance to the embassy
Posts: 3,020
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Rearranging the post from heifetz17, we see fuel system problems that an old dirty fuel tank or failing fuel pump might cause:
*FUEL FILTER/PRESSURE REGULATOR (LOW)
*INTERMITTENT FUEL SYSTEM DTC
*RESTRICTED FUEL SUPPLY LINE
*FUEL PUMP INLET STRAINER PLUGGED
*FUEL PUMP MODULE

We see sensor and sensor wiring harnesses as possible problems.
However, sensors are said to have been replaced.

*O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP
*O2 SENSOR GROUND CIRCUIT VOLTAGE DROP
*O2 SENSOR
*CHECKING ECT SENSOR
*ECT WIRING HARNESS INTERMITTENT
*MAP SENSOR

So what is left, if the motor is mechanically sound, the throttle position sensor circuit.
*TPS VOLTAGE CHANGE NOT SMOOTH
*TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
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Old 16 Aug 2013, 07:05 pm
Young Cruiser
 
Join Date: Jan 2013
Location: On Vancouver Island, BC
Posts: 80
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Quote:
Originally Posted by sanatanadharma View Post
Rearranging the post from heifetz17, we see fuel system problems that an old dirty fuel tank or failing fuel pump might cause:
*FUEL FILTER/PRESSURE REGULATOR (LOW)
*INTERMITTENT FUEL SYSTEM DTC
*RESTRICTED FUEL SUPPLY LINE
*FUEL PUMP INLET STRAINER PLUGGED
*FUEL PUMP MODULE

We see sensor and sensor wiring harnesses as possible problems.
However, sensors are said to have been replaced.

*O2 SENSOR SIGNAL CIRCUIT VOLTAGE DROP
*O2 SENSOR GROUND CIRCUIT VOLTAGE DROP
*O2 SENSOR
*CHECKING ECT SENSOR
*ECT WIRING HARNESS INTERMITTENT
*MAP SENSOR

So what is left, if the motor is mechanically sound, the throttle position sensor circuit.
*TPS VOLTAGE CHANGE NOT SMOOTH
*TPS VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE CLOSED
One great breakdown and analysis right there!
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Old 17 Aug 2013, 09:41 am
Fresh Cruiser
 
Join Date: Aug 2011
Location: Denver, CO
Posts: 3
Default Re: ERROR CODE P0171 CAN'T FIX & CLUELESS!

Thanks all I think I will try with the fuel system and troubleshoot that will let you all know the results.
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bank one, p171 code, too lean


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