My 348 failed the "exhause/emission" test att vehicle inspection... | FerrariChat
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My 348 failed the "exhause/emission" test att vehicle inspection...

Discussion in '348/355' started by PatrikD, May 21, 2013.

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  1. PatrikD

    PatrikD Rookie

    May 12, 2012
    48
    Sweden, Dalarna
    Full Name:
    Patrik D
    #1 PatrikD, May 21, 2013
    Hi all,some problem here...

    Today i was att the Vehicle inspection , and the lilttle 348 did not pass the "exahuse/emission" test, all the measured values where to high, except Lamda reading that was to low...
    The reading was like this (dont know if it is the same name in US and Europe that we have in Sweden).
    CO 2,5 (Ok value 0,5), HC 754 (Ok value 100), CO2500 3,5 (Ok value 0,3), Lambda 0,91 (Ok value 0,97-1,03).

    Any good ideas??? , the last time the values was really good...

    Thanks

    Best Regards

    Patrik
     
  2. 348Jeff

    348Jeff Formula 3

    Oct 25, 2011
    1,547
    UK
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    Jeff
    #2 348Jeff, May 21, 2013
    Maybe worth cherking your MAFs are within "spec" - plenty of threads on here plus also I did mine too and passed my emissions last week with flying colours and thats with decats (in UK)

    348 DIY "Restoration" - Page 102

    At very least get some MAF cleaner and clean them
     
  3. PatrikD

    PatrikD Rookie

    May 12, 2012
    48
    Sweden, Dalarna
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    Patrik D
    #3 PatrikD, May 21, 2013
    Thanks, gonna check them!
     
  4. TomPDX

    TomPDX Formula Junior

    Mar 28, 2008
    558
    Oregon
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    Tom
    #4 TomPDX, May 21, 2013
    No codes (check enging light)? Sounds like bad cats maybe ... ?
     
  5. Nosevi

    Nosevi Formula 3

    Jul 8, 2011
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    Lincoln
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    Pete
    #5 Nosevi, May 21, 2013
    Patrik, that seems way out of kilter. Had mine tested not long ago with high flow sports cats and it wasn't even close to your values. Maybe try an ecu reset as well as checking the MAFs. Did a reset on mine before the test and these were my results - different way of measuring than your test but no where close to the limits.

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  6. SoCal1

    SoCal1 F1 Veteran
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    Jun 14, 2011
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    SoCal LA/OC/New Mexico
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    Tim Dee
    #6 SoCal1, May 21, 2013
    Does it have cats on. I get similar readings without Cats
     
  7. Nosevi

    Nosevi Formula 3

    Jul 8, 2011
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    Lincoln
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    Pete
    #7 Nosevi, May 21, 2013
    Patrik, one other thing, your car is a '91, right? Some of those pass numbers look awfully low for a '91 car. They're not testing it under today's emmissions numbers are they? Thought the numbers were the same throughout Europe so why are some pass numbers for yours which is a '91 lower than for mone that is a '93? Could be wrong but thought emmissions numbers were the same throughout Europe. Obviously yours still look high though.
     
  8. PatrikD

    PatrikD Rookie

    May 12, 2012
    48
    Sweden, Dalarna
    Full Name:
    Patrik D
    #8 PatrikD, May 22, 2013
    Last edited by a moderator: Sep 7, 2017
    i dont know how the limits in emission are on a newer or a older Car, but here in Sweden they are cazy about polution/emissions from cars.....if the goverment had their whises come true, there would be no cars, only bicycle´s....

    Anyway, i started to tear her down yesterday, went true all the engine ventilation, and alla the hoses was ok, not plugged.

    Checked the vac.valves for air into the exhaust from airintake (thinking about if thoose was open and to much oxygen where in the exhaust and fooled the oxynge sensors), but thoose worked like they should.

    BUT here is a real surprise, i took out both of the Oxyene sensors.

    In picture 2 there is something missing......

    The metallcontacts for the Oxygen sensor was not in the plastic "housing", it was in the rubber housing.. the little metal tounge that suppose to hold the contact to the plastic housing was way to long in so it could not grab the housing, maybe someone has change oxygene sensors on it before, and recontacted on the old contact.

    Finnaly i tried the sensors with a propane torch and they where working.

    im not an expert on cars, but this must be a explenation to the weird results on the emission test....


    Patrik
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