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Smog Testing/EVAP

Discussion in 'Technical Q&A' started by Lumcam, Jul 20, 2019.

  1. Lumcam

    Lumcam Rookie

    Dec 15, 2014
    6
    #1 Lumcam, Jul 20, 2019
    Need Help!! I have a 99 360 and I am trying to get emission testing done. I have driven the car 200 miles and have done the drive cycle 4 times without success. I had the EVAP light come in as ready and then a few minutes later, it was not ready. This has happened several times already. What can be the cause!? TIA
     

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  2. mello

    mello F1 Rookie
    Silver Subscribed

    Jul 12, 2013
    4,137
    CA Bay Area
    Full Name:
    Steve
    #2 mello, Jul 20, 2019
    Make sure gas cap is tight. If that doesn't fix the problem, then do a smoke test of the EVAP system.
     
  3. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,182
    Berkeley, CA
    Full Name:
    Brian Brown
    #3 Motob, Jul 20, 2019
    If the gas cap is good/tight, then a smoke test will reveal the source of the leakage. The roll-over valves and fuel pumps are both sources of potential leaks.
     

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