Since idle only tests cannot pick up defective or missing catalytic converters, EGR systems, modified engines or other problems that created excessive pollutnats such as NOx, many areas got the IM 240 tests, otherwise known as the dynamometer tests. Keep in mind the '81 came in two different versions, 49 state and California. The California version got the 2 way catalyst with O2 sensor and electronic ignition. Since the California Air Resources Board (CARB) was started before the EPA they are recognized and can set different standards than the EPA. Other states have to follow the EPA and most state emissions inspections programs are the result of there being non-attainment areas. States can also choose to use the CARB standards. VW used the fuel injection from 1975 in many of their vehicles to avoid using a catalyst. VW also avoided EGR for most engines. Most cars went to the three cat and O2 sensor between 81 and 83 for NOx reduction. This was the most likely reason for the end of the air cooled engine and probably the reason the Vanagon never saw the inline 4's. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Richard A Jones Sent: Sunday, March 18, 2012 6:22 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: Catalytic Converter???? Anyone go without it??? I unknowingly ran my '81 Vanagon for several years with a hollow cat. It had to pass emissions every year and it did. With a new cat, it continued to pass emissions, perhaps with slightly lower readings, but I'd have to check the records for that. Of course, it has the bad-mouthed 2.0 l air-cooled engine.... Richard |
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