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Thread: PLEASE HELP!!! - X16SZR can't solve emissions problems to get it thru MOT

  
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    PLEASE HELP!!! - X16SZR can't solve emissions problems to get it thru MOT

    Hi Guys,

    My Astra 1.6 8v (X16SZR) is driving me crazy.

    It failed MOT with very high emissions, have replaced Lambda O2 sensor, cat converter, Air filter, but emissions still persist high and car is running rich with blackened muck (unburnt fuel?) on spark plugs (plugs new about 2 months ago)...

    It's been suggested my ECU is the problem as it has not got 'refurbished/re-manufactured' marked on it.

    How likely is this to be the problem.. are there any other possibilites which would cause the car to still run *excessively rich* after replacing o2 sensor, cat etc...

    By the way, the 0130 O2 sensor code has come up again, with the *new* sensor... could it have been ruined by the rich mixture?

    Your help appreciated, gentlemen...

    chugaboom

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    Windrew's Avatar
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    what have you done with the egr valve?
    ARDEN BLUE GSI

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    P.S. EGR valve replaced with genuine delphi 4 weeks ago - so that can be ruled out... I hope!

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    the refurbed ECU'S (i had to have one on put on my X16SZR when i owned it) were fitted mostly under warranty to Astra's that were plagued with constant running problems that manifested with random lighting of the EML during running, it often gave lambda/EGR/MAP sensor fault codes that kept returning even when these parts had been replaced. some cars ran like bags of shite others ran well but had constant fault codes appearing. when you say the plugs are black, is it dry or wet and black?

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    Hi Steve

    The plugs are *wet* and black...

    Cheers,
    Rob

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    this indicates that either there is bottom end wear or valve stem leakage. wet and oily plugs will struggle to efficiently burn all the combustable mixture within the chambers. do you have the MOT failure sheet to hand?, if so post up the c/o readings, this will help to understand better the mixture problems you are having

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    Hi Steve/all
    When the car was MOT'd 10 days ago, the results were:

    Fast idle test 1 - 3000 rpm
    CO = 4.08% (0.3 max allowed)
    HC = 432ppm (200 max allowed)
    Lambda = 0.904 (0.97-1.030 required)

    Fast idle test 2 - 3000rpm
    CO = 4.09% (0.3 max allowed!)
    HC = 486ppm (200 max allowed)
    Lambda = 0.895 (0.97-1.030 required)

    Natural Idle
    CO = 3.17 (0.50 max allowed)

    Things got much better after changing the O2 sensor, CO dropped to about 0.86 but during the re-test taken today, (after new cat fitted) it started off looking good, as if it were going to pass, then the ECU light came on, gave O2 sensor code and emissions went dreadful again.!

    It's been suggested a bad ECU could cause this... my ECU is not one of the refurbished ones as there's no mark, stamp or label to state such, so perhaps I have one of the original troublesome ones which needs attention?
    Or maybe its mechanical.. I just don't know

    Cheers,
    Rob

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    no lambda signal present by the look of that, switching is non existant and could be the ecu failing to trigger, HC is also high which is pointing to unburnt fuel passing through, probably as a result of the oil fouled plugs. your ecu will be the older troublesome type and you may well benefit from the refurbed ones which can be had for around £180 exchange, but as this is alot of dosh, the final choice has to be up to you Rob

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    Hi Steve

    I'm going to get the ECU tested and repaired/refurbished if faults are found. The best price seems to be from 'Blue Streak'... anyone out there used them? Do they give a good service?

    Cheers fellas

    Rob

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    Hi guys

    I have got the ECU back, no fault found... now where do I look (please see my other post today listing what has been changed thus far)

    Thank you all for your help so far

    Rob

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