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  #1  
Old 01-24-2011, 01:38 PM
allworthcm allworthcm is offline
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Default 4.7 with engine codes p0171 and 0174

Hello every one

New Ram owner here looking for some answers to my problems. I have an 03 1500 with the 4.7 that has 0171 and 0174 engine codes. My first reaction is to replace the O2 sensors but I have a problem beleiving that they all would go out at the same time.

Any body have any suggesstions on what would cause the engine to run lean on both sides? Is it a cat problem or maybe MAP sensor? I have been getting horrible MPG and a lack of power also.

Thanks
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  #2  
Old 01-24-2011, 01:46 PM
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Below is a list of possible causes:

FUEL PRESSURE OUT OF SPECS
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP INLET STRAINER PLUGGED
FUEL PUMP MODULE
O2 SENSOR
O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
O2 SENSOR HEATER OPERATION
TP SENSOR VOLTAGE GREATER THAN 0.92 OF A VOLT WITH THROTTLE CLOSED
TP SENSOR SWEEP
MAP SENSOR OPERATION
ECT SENSOR OPERATION
ENGINE MECHANICAL PROBLEM
FUEL FILTER/PRESSURE REGULATOR
PCM
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Old 01-24-2011, 01:49 PM
allworthcm allworthcm is offline
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Default

If it is using more gas than usaul would it still be a fuel pressure or delievery problem?
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