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Thread: P0420, p0301, p0304

  1. #1
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    Default P0420, p0301, p0304

    Thought I would start from scratch.
    Got code reader today and plug in to find the above.
    301 and 304 misfire in 1 and 4
    P0420 Catalyst System Efficiency Below Threshold (Bank 1)


    What is the cat 1?
    Is that my cat kaput or is this my 02 sensor playing up?
    Is this what is causing the misfire or is this in addition to the misfire or is the because of the misfire?
    Live data and freeze data I can put up too if it would help.
    So far
    Ignition coil changed
    Plugs changed
    Fuel Pump changed
    FPR changed.


    This has only been occuring since a water pump change of which the only thing removed was exhaust manifold

  2. #2
    VIP-Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

    Mileage : 567890987

    Default

    Have you cleared the codes and re read them?

  3. #3
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    not since changing fpr.
    Only just got this reader so just getting used to what I need to do

  4. #4
    VIP-Member Das's Avatar
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    Vehicle : Lada

    Trim : Riva

    Engine : 6.0 V12

    Year : 1954

    Mileage : 567890987

    Default

    Clear and re read, then see what the reader comes up with. Id have said the cat code is possibly a follow on from the misfire codes, one affecting the other IYKWIM?

  5. #5
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    Default

    Cleared codes and now nothing showing. No difference as misfire will still occur.
    Freeze data gives me detail on misfire in cylinder 1
    DTCFRZF P0301
    Fuelsys1 CL
    Fuelsys2 N/A
    LOAD_PCT (%) 65.5
    ETC (F) 199
    SHRTFT1 (%) -2.3
    SHRFT3 (%) -100
    LONGFT1(%) -5.5
    LONGFT3(%) -100
    MAP(inHg) 23.3
    RPM(/min) 3434
    VSS(mph) 46
    FRP(PSI) 1337.2

    Although I don't understand any of that it seems all sensors and fuel seem fine at misfire.
    I do believe CAT is fine and just threw 420 up because of misfire.
    Readings on idle if anyone understands these details
    Idle
    DTC_CNT 0
    Fuelsys1 CL
    Fuelsys2 N/A
    LOAD_PCT (%) 12.2
    ETC (F) 167
    SHRTFT! (%) 2.3
    SHRFT3 (%) -100
    LONGFT1(%) -2.3
    LONGFT3(%) -100
    MAP(inHg) 6.8-7.1
    RPM(/min) 748-760
    VSS(mph) 0
    SPARKADV(0) 29
    IAT(F) 52
    MAF(lb/min) 0.287-0.295
    TP(%) 2.7
    02SLOC B1S12--B2S----02B1S2(V) 0.410-0.425
    SHRTFTB1S2(%) -100
    OBDSUP EOBD
    MIL_DIST(MILE) 0
    FRP(PSI) 690.7-746.9
    EQ_RATB1S1 0.996-1.009
    02B1S1(V) 1.498-1.532
    EQ_RAT11 0.996-1.008
    02S11(mA) -0.078-0.023

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    Engine : Z18XER


    Default

    If you've got a misfire then your not burning fuel properly

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