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Thread: Help please in regards to emmissions and MOT

  1. #1
    Guest liamb91's Avatar
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    Help please in regards to emmissions and MOT

    Hi all,

    The S15 had its first MOT (Torque GT done the last on import) on Monday at a local ford dealership as my mate works there, it went perfectly well (not 1 advisory), but it failed on the fuel/02 mixture in the exhaust. 1.03 is the limit mine was 1.08.

    I did have the bung (bolt in silencer in the exhaust) in the exhaust (Blitx Nur catback), would that increase the amount the 02 sensor is reading at all?

    I have ordered a new 02 sensor which arrives tomorrow, will this fix them problem like the garage said it will?

    Thanks

    Liam

    P.s - how easy are they to fit the 02 sensors, can see it on the elbow in the bay so should be straight forward

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    Guest R3K1355's Avatar
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    Did you rape the shit out of it on the way there??

    That usually helps.

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    Guest liamb91's Avatar
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    Quote Originally Posted by R3K1355 View Post
    Did you rape the shit out of it on the way there??

    That usually helps.
    Took it very easy actually as the conditions were dreadful (could hardly see)

    It failed on the high idle test at about 2800 rpm.

  4. #4
    Now with 400bhp....
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    I'm guessing the cars fitted? If so get it really hot before the test and try again as mentioned above
    1998 Nissan 200sx s14a , 2000 std 5 speed with nismo supercoppermix clutch bn6 Sapphire Blue

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    Guest liamb91's Avatar
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    Quote Originally Posted by Chriscooke View Post
    I'm guessing the cars fitted? If so get it really hot before the test and try again as mentioned above
    Cat was in yes! Everything passed bar the 02/fuel mix, which is a little over. ive got a new 02 sensor on its way. will take the bung out and give it loads

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    Check for exhaust leaks too. 1.08 indicates a lean mixture measured by the MOT mans probe, not necessarily what is further upstream at the elbow!

  7. #7
    Now with 400bhp....
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    The bung can help depending on the exhaust design.
    1998 Nissan 200sx s14a , 2000 std 5 speed with nismo supercoppermix clutch bn6 Sapphire Blue

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    Guest Zornyan's Avatar
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    Bottle of redex/forte/wynns in the tank and getting the cat nice and hot just before the test usually brings the numbers down nicely

  9. #9
    Guest liamb91's Avatar
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    Quote Originally Posted by Chriscooke View Post
    The bung can help depending on the exhaust design.
    Blitz Nur, i'll try it with and without!

  10. #10
    Guest liamb91's Avatar
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    Quote Originally Posted by hi_im_fil View Post
    Check for exhaust leaks too. 1.08 indicates a lean mixture measured by the MOT mans probe, not necessarily what is further upstream at the elbow!
    they did say they just had the machine calibrated that morning! ill check for leaks when its on the ramp, doesnt sound like its blowning at all

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