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Need Help with Emission Test
Posted by K Gland (more from K Gland) on Sun, 9 Jan 2000 18:07:28
I recently moved to Connecticut where they have dyno emission testing.
Although my '86 900S (16-valve) is well maintained, it failed on Nitrogen
Oxide (NOx) - about twice the permitted level. I replaced the O2 sensor and
went back, only to fail again with little improvement. I took my car to one
of the 'state emission certified' garages to see if they could figure out my
problem. They told me that everything checked out and that they couldn't
find a problem. They said that the cat was increasing temp 100 degrees from
front to back - the way it's supposed to. However, they said that the front
section of the cat that breaks down NOx may not be working and that I could
try replacing the cat. I went ahead and had them do this repair because
it's also the only thing that I could think may be a problem. I'll take the
car back to test it again this week.
Have any other of you had similar problems with your cars? Is there a way
to lower combustion temp to reduce the NOx gases? I'd appreciate any help
offered. Please reply to me directly as I'm not on the mail list. Thanks
Kraig '86 900S
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