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Thread: Vectra 2.2 Direct Z22YH - Mot Emissions Failure

  1. #1
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    Default Vectra 2.2 Direct Z22YH - Mot Emissions Failure

    Original post was deleted when the Forum was down original post was-

    'Hi everyone, wondered If I could get some pointers towards working out whats wrong with my car.

    I have an emissions light on as well.

    Mot failure readings were:

    Fast Idle test 1
    CO 1.43%
    HC 192ppm
    Lambda? 1.034

    Second Fast Idle Test
    CO 1.41%
    HC 216ppm
    Lambda 1.023

    Natural Idle Test
    CO 1.35%

    Checked all hoses for leaks, but found nothing.

    Full service with Plugs, fuel filter, Air filter etc.

    Got reading for Emissions warning light from a friends reader..

    Catalyst efficiency Low.
    Coolant Temp sender malfunction
    Coolant fan 1 error
    Coolant fan 2 error.

    Replaced the coolant temp sender.

    Cleared all codes, and after 2 road tests not returned but still smells rich to me.

    So he did a readout for me and put it on the thumb drive with live data which was:

    Engine: Z22YH
    Hardware manufacturer system name: SIMTEC81

    Live Data:

    B1S1 O2 Sensor Heater (Bank 1 Sensor 1) -Active
    B1S1 O2 Sensor (Bank 1 Sensor 1) -1.504 mV
    B1S1 Air/Fuel Ratio (Bank 1 Sensor 1) -Rich
    B1 O2 Sensor Loop (Bank 1) -Closed
    B1S2 O2 Sensor Heater (Bank 1 Sensor 2) -Active
    B1S2 O2 Sensor (Bank 1 Sensor 2) -98 mV
    B1S2 Air/Fuel Ratio (Bank 1 Sensor 2) -Rich
    B1 Short Term Fuel Trim (Bank 1) -1 %
    Catalyst Protection Enrichment (Bank 1) -Inactive
    Full Load Enrichment -Inactive
    Desired Engine Idle Speed -738 RPM
    Engine Speed -741 RPM
    Idle Speed Modified -NO
    Idle Speed Offset -Inactive
    Vehicle Speed -0 km/h
    Mass Air Flow Sensor -0.66 V
    Mass Air Flow Sensor -10 kg/h
    Intake Air Temperature -27 °C
    Intake Air Temperature -1.68 V
    Manifold Absolute Pressure -1.02 V
    Knock Control -Inactive
    Desired Fuel Pressure -5.000 kPa
    Fuel Pressure Feedback -5.066 kPa
    Fuel Pressure Feedback -1.6 V
    EGR Valve (Exhausts Recirculation) -Active
    EGR Position Feedback (Exhaust Gas Recirculation) -0.88 V
    EGR Position Commanded (Exhaust Gas Recirculation) -0 %
    EGR Pulse Ratio (Exhaust Gas Recirculation) -40 %
    Fuel Tank Ventilation Valve -Active
    Fuel Tank Ventilation Valve -40 %
    Swirl Level Control Solenoid Valve Pulse Ratio -16 %
    Battery Voltage -13.7 V
    Ignition Status -On
    Main Relay -Active
    Starter Relay -Inactive
    Fuel Pump Relay -Active
    APP at Idle Position (Accelerator Pedal Position) -Active
    APP Sensor 1 (Accelerator Pedal Position) -0.98 V
    APP Sensor 2 (Accelerator Pedal Position) -0.47 V
    APP Sensor 1 Learned Lower Position
    (Accelerator Pedal Position) -0.97 V
    Calculated Throttle Position -4 %
    Throttle Position -Idle
    TP Sensor 1 (Throttle Position) -0.57 V
    TP Sensor 2 (Throttle Position) - 4.43 V
    TP Sensor 1 Learned Lower Position
    (Throttle Position) -0.34
    Throttle Position PWM Servo Signal -93 %
    Ambient Temperature -15 °C
    Coolant Temperature -83 °C
    Coolant Temperature -1.62 V
    Intake Air Temperature -27 °C
    Normal Engine Operating Temperature -Active
    Oil Level - Normal
    Engine Oil Level Status -Okay
    Cruise Control -Inactive
    Cruise Control Tip Switch -Inactive
    Vehicle Speed in Cruise Control Range -Inactive
    Vehicle Acceleration -0 m/s2
    Vehicle Speed -0 km/h
    Tank Sensor -1.76 V
    Tank Sensor -29 L
    Malfunction Indicator (MI) -Off
    Service Vehicle Soon (SVS) Indicator -Off
    ETC Limp Home Mode (Electronic Throttle Control) -Inactive
    Engine Oil Change Warning -Active
    Injector Time -0.9 ms
    Ignition Spark Angle -25 °CA
    Ignition Dwell Time -4.0 ms
    Calculated Pedal Position -0 %
    Calculated Throttle Position -4 %
    Fuel Tank Ventilation Valve -0 %
    Mass Air Flow Sensor -11 kg/h
    Knock Retard Cylinder 1 -0 °CA
    Knock Retard Cylinder 2 -0 °CA
    Knock Retard Cylinder 3 -0 °CA
    Knock Retard Cylinder 4 -0 °CA
    IAC Adaptation Slope (Idle Air Control) -17.97 %'

    Ste originally helped me.
    Concensus was there must be and air leak on the exhaust throwing off the readings.
    I also have a slight 'thump' down the exhaust almost like it has missed, and has no regularity.(may not be relevant)
    I also did a 'Live Graph' nad there showed some moment of extreme richness (800mv) then dripping straight down to sub 100mv.
    I Suspected a Cat but could not be 100% on that plus the cause of the failure.

    I took to local garage to replace the downpipe (very slight leak/ corroded) and checked the CAT and advised me all appeared to be well from below. When I collected we ran some leak tests and got nothing, to the point where the engine almost stalled.
    The idle was the same, so I reran live graphs, and there was no change on the second sensor?

    I then removed Lambda 1 (wideband) and checked for damage etc and although black soot all over it, was intact etc. A quick look at the top of the cat and could not see a thing? as I moved away, I knocked a bolt and it went straight down the Lambda hole!?
    (yes I can hear the snigger's, however I have been off the spanners for 11 years in my defence)

    So I removed the CAT etc and found.... Nothing! Empty. In what world does 'CAT looks fine' is that.

    Anyhoo, apart from the obvious, and confirming what I already knew, where does that leave me in regards to the cause.
    And why am I showing so much O2 on no.2 Lambda.
    The only thing I can think of is in regard to the odd miss (the only way I can describe it as mentioned earlier) is unburned/
    partially unburned cylinder releasing both air and fuel. And wondering If this is the cause of the Cats demise.. (although this seems extreme)

    Does anyone think CO and HC readings are high, even without a Cat?

    I've been advised Fuel trim and Injector duration is a good sign of engine faults.
    Fuel trim is always around -1/ +1 90% of the time.
    Injector duration is always .9ms at idle. (is this normal spec?)

    What else is there to double chk..

    Thanks
    Last edited by justathome; 31st August 2010 at 11:08.

  2. #2
    Regular Member LADmachining's Avatar
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    The second O2 sensor is used as a plausibility check on the condition of the catalytic converter. It makes no difference to the air/fuel ratio of the engine. Normally, a live data graph of sensor 2 should be a flat line. As converter efficiency decreases, it will slowly start to show peaks in time with sensor 1, switching between lean/rich, until eventually the two give exactly the same readings when the cat is either useless or empty.

    The cat provides back pressure to the engine whilst it is running, and removal of this back pressure can cause the engine to go off tune, resulting in higher than normal CO and HC readings.

    I would replace the cat as a first course of action, as even if you get any other running problems sorted, the car will not pass an MOT without it! After that, its a case of checking for any other problems that may have caused the cat to fail in the first place...

  3. #3
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    Yeah, I've ordered the Cat. Will just reduce driving till I'm happy I've got no other issues.

    'it will slowly start to show peaks in time with sensor 1, switching between lean/rich, until eventually the two give exactly the same readings when the cat is either useless or empty.'

    This is what I expected, but did not get this, it would stay around 100mv for 90% of the time and then I will get the odd peak of around 800mv.. but this would be like twice and a 2 minute scan.Hence I suspected an air leak..

    'The cat provides back pressure to the engine whilst it is running, and removal of this back pressure can cause the engine to go off tune, resulting in higher than normal CO and HC readings.'

    I never thought of back pressure... Thanks

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