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smog test Lambda value at limit 850 1994

posted by  tom 240 on  Tue Mar 3 20:06 CST 2009
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last visit: Wed Jun 17 18:20 CST 2009
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Hi,
had to go for the smog test yesterday, thanks to the guy measuring twice we finally got lambda value at upper limit at high rpm over 2000 and passed.

But would like to understand better what this is all about and where to look.
It is a 850-94 NA engine with 270k kms on, no major repairs (no A2/A6 DTC), air filter renewed at 240k kms, MAF cleaned once two years ago.Is cleaning causing lean or rich mix? and high lambda?

Lambda value is about oxygen level at O2sensor, one before cat in this 850:
- is my original sensor getting old and/or dirty (is dirty sensor causing high lambda?) or
- is my exhaust leaking before O2sensor or
- is my air intake leaking after MAF or is MAF getting old/dirty,or
- is my cat getting worn out
-does ECU reset by power off have any effect

all the measurements at over 2000 rpm (high limit value)
CO=0%(0.3),HC=11ppm(100), lambda=1.03(1.03),CO2=14%(-), O2=1.2%(5.0)

Br Tapsa






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New smog test Lambda value at limit [850][1994]
posted by  tom 240  on Tue Mar 3 20:06 CST 2009 >


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