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    Thread: 1984 gti rabbit failed california smog

    1. 07-20-2012 12:52 AM #1
      Car Failed Smog

      It failed NO at 15 & 25 mph (see below)

      The car is a 1984 VW rabbit GTI BOSCH CIS mechanical fuel injection, with o2 sensor, NO EGR, the car has about 300k miles. I changed the cat converter in 2004 and the NO went to 0 it has increased over the years and now it is high and failed. I believe my hc and co are fine, what should I do? richen it up by adjusting the air/fuel mixture to get the NO to drop? or install a new cat, results are below

      15mph RPM 1954
      C02 14.59
      O2 0.26

      HC 28; Max 107 Ave 35
      CO .16; Max .63 Ave .19

      NO 1091; Max 845 Ave 564 FAILED

      25mph RPM 2198
      C02 14.90
      O2 0.07

      HC 24; Max 89 Ave 30
      CO 0.10; Max .71 Ave .14

      NO 726 ; Max 726 Ave 464 FAILED

    2. 08-28-2012 07:01 PM #2
      There maybe something you can do to the tune.
      http://webpages.charter.net/meduke/c...adjustment.htm has a how to that fixed a similar issue.

      Could be as simple as taking the injectors off and soaking them in cleaner.

    3. Member
      Join Date
      Jan 7th, 2009
      Glendale, CA
      1987 & 1986.5 Scirocco 16V
      08-29-2012 02:49 AM #3
      Sounds like you need a new catalytic converter.
      Retarding the timing a bit usually lowers the NO

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