1996 E36 323i - emissions failure

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  1. 1996 E36 323i - emissions failure 
    #1
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    edjenkins's Car Details
    Model of Car:
    323
    Year of Manufacture:
    1996
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    I have a 1996 E36 323i which has failed the MOT on emissions.
    The car was showing fault codes on both Lambda sensors and the MAF. These have all been replaced and all fault codes cleared but the emissions are still way out (CO=4.5%, HC=480ppm, Lambda=0.85). These have improved a bit since replacing those sensors.
    Does anyone have any idea what could be causing this? I suspect possibly a misfire or coolant/air temp sensor but no other fault codes are showing.
    Is there an easy way to test coils/misfiring?
     
     

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    Were the lambda sensors genuine/OEM? and the MAF?

    Also has the live data been checked while the engine is running?
     
     

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    edjenkins's Car Details
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    The Lambdas are genuine NTK parts. The MAF is a pattern part. I had a full live diagnostic done yesterday. This showed the MAF to be faulty again. The replacement pattern one has only been on there a week! Also the Camshaft position sensor was displaying -4 all the time regardless of revs. Don't know if this is normal or if it suggests the sensor is faulty? Anyone??
     
     

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    Quote Originally Posted by edjenkins View Post
    The Lambdas are genuine NTK parts. The MAF is a pattern part. I had a full live diagnostic done yesterday. This showed the MAF to be faulty again. The replacement pattern one has only been on there a week! Also the Camshaft position sensor was displaying -4 all the time regardless of revs. Don't know if this is normal or if it suggests the sensor is faulty? Anyone??
    What make is the MAF and where did it come from?

    Aad have the induction pipes, engine breather pipes and vacuum pipes all been checked over for splits which will allow unmetered air to enter into the engine.

    Also what scanner was used to read the codes?
     
     

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    edjenkins's Car Details
    Model of Car:
    323
    Year of Manufacture:
    1996
    Transmission Type:
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    Car Body Type:
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    Hi Ronnie,
    I don't know what make the MAF is. It came from eBay and has no markings on it. Probably should have just gone for a genuine one in the first place. I have checked over all of the pipes and cannot see any splits anywhere. The scanner used was a snap on. I don't know what model it was I'm afraid. Would a faulty maf cause emissions as high as I had?
     
     

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