1995 Mazda b4000

Description of Problem: 1995 Mazda b4000 v6 4×4 rough idle to the point where engine jumps but does not shut off when the accelerator is pushed the problem stops it only happens accelerator is not pressed. At stop lights in park etc. Replaced throttle position sensor and egr pressure sensor and the problem still persists. Could this be the egr valve causing this? Check engine light codes read p0402 p1121 p0102 p0174 p0171

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1 thought on “1995 Mazda b4000”

  1. Freeautomechanic

    Sounds like you may have several problems. If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
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    P0402 Mazda – Exhaust Gas Recirculation Flow Excessive Detected
    Possible causes
    – EGR volume control valve stuck open
    – Faulty EGR volume control valve
    – EGR solenoid valve harness is open or shorted
    – EGR solenoid valve circuit poor electrical connection
    – Faulty EGR temperature sensor and circuit

    P1121 Mazda – Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
    Possible causes
    – Faulty Throttle Position Sensor
    – Throttle Position Sensor harness is open or shorted
    – Throttle Position Sensor circuit poor electrical connection

    P0102 Mazda – Mass Air Flow Circuit Low Input
    Possible causes
    – Faulty mass air flow sensor
    – Intake air leaks
    – Dirty mass air flow sensor
    – Dirty mass air filter
    – Mass air flow sensor harness is open or shorted
    – Mass air flow sensor circuit poor electrical connection

    P0171 Mazda – Lean Air/Fuel Ratio Bank 1

    Possible causes
    – Intake air leaks
    – Faulty front heated oxygen sensor
    – Ignition misfiring
    – Faulty fuel injectors
    – Exhaust gas leaks
    – Incorrect fuel pressure
    – Lack of fuel
    – Faulty Mass Air Flow (MAF) sensor
    – Incorrect Positive Crankcase Ventilation (PCV) hose connection

    P0174 Mazda – Lean Air/Fuel Ratio Bank 2
    Possible causes
    – Intake air leaks
    – Faulty front heated oxygen sensor
    – Ignition misfiring
    – Faulty fuel injectors
    – Exhaust gas leaks
    – Incorrect fuel pressure
    – Lack of fuel
    – Faulty Mass Air Flow (MAF) sensor
    – Incorrect Positive Crankcase Ventilation (PCV) hose connection

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