Dec 052015
 

2005 Jeep Liberty
Working on friends jeep she had battery light come on and started heading home about 30min 25miles later overheated and stalled.. i went the next day and pulley was loose replaced water pump and coolant started car and it was jerking running rough.     Pulled codes p0300(multiple misfire) P0700(transmission control module malfunction) and p0562 (system voltage low).   I replaced the spark plugs and battery still ran rough at idle but ok going down the street almost stalls between drive and reverse and at stops.  only took out to refresh codes since battery disconnect.   New codes are P2305(cylinder2 misfire) p2311 (coil 2nd circuit number4 cylinder) and p0123(TPS detects high volts…   now i had pulled all the coils once and,checked the tps when i was diagnosing looking for any heat damage and also to see which coils were not affecting when unplugged.   I cleared codes and all im getting now is p0175 p0173 which is rich exhaust detected by o2 sensors but the three it just showed weren’t there anymore… now she ordered 2 coils and a TPS and went to a mechanic who tells her its blown up wont be specific at all he claims its got no oil in it however i checked the levels and they were fine before i left it parked there without TPS or the two bad coils in it so she couldn’t drive it how could it be blown also how could it not be blown because I’m no certified mechanic but i know a lot and i didn’t think it was blown up beyond repair it was still starting, and idling before i removed those parts..? Suggestions opinions help?!?!

  One Response to “05 jeep liberty 3.7”

  1. She drove the car for 25 miles and or 30 minutes after the engine was already at operating temperature. So for 30 minutes she drove with it overheating to get home. Most likely blew a head gasket or cracked a head. This would allow coolant to the plugs and foul them out. A cooling system pressure test and a cylinder compression test should be performed.

    Blown Head Gasket Symptoms

    ————————————————————————————————————

    P0175 – Fuel System 2/1 Rich
    Possible causes
    – Faulty front heated oxygen sensor
    – Ignition misfiring
    – Faulty fuel injectors
    – Exhaust gas leaks
    – Incorrect fuel pressure
    – Faulty Mass Air Flow (MAF) sensor

    With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

    In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).

    P0173 Jeep – Fuel System 2/1 Rich Control Over Limit

    Possible causes
    – Faulty front heated oxygen sensor
    – Ignition misfiring
    – Faulty fuel injectors
    – Exhaust gas leaks
    – Manifold Absolute Pressure (MAP) Sensor

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