DIYbanter - View Single Post - EPA caught VW cheating

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On Sun, 20 Sep 2015 08:00:37 -0700, sms
wrote:

On 9/19/2015 8:15 PM, wrote:

Exactly what are you trying to say??? My reply was to say there were
many instances of people - hobbyists and mechanics alike, screwing
with emmission controls in an attempt to defeat them and get better
mileage and power, and getting (usually) neither.

That was the big problem in California. A significant number of
out-of-compliance vehicles were causing most of the pollution. Even
though percentage-wise the number of such vehicles was small, in
absolute numbers it was large enough to cause a problem.

The "catalytic converter test pipe" was popular for a while. But as you
said, in most cases, all the tampering with emissions controls did not
have any effect on mileage and/or power.
Didn't have any significant positive effect on mileage and or power.

And the "test pipe" stopped being an option in 1996 with OBD2 testing
pre and post cat O2 - unless you bought an O2 fake-out device that
generated a fake O2 signal (actually, 2 signals ----)- which caused
other problems (genrally a lot poorer fuel mileage and not much power
improvement, if any)