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Old 09-29-2011, 11:35 AM   #1 (permalink)
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Failed emissions -92 MX-3 GS

A week ago poor Princess failed emission with the following results(limit in parenthesis):
  • CO 2.1(0.5)%
  • CO2500 0.6(0.3)%
  • HC 235(100)ppm
  • Lambda 0.98(0.97-1.03) (Passed, but listed for reference)


A while back the ignition module failed on me, and while diagnosing there was a lot of starting. So i suspect that the oil is flooded gas soaked, i'll be changing that soon, and also checking ignition timing, since it may have shifted when i disassembled the distributor.

There is another symptom also: When hot she hesitates on low revs, but runs fine otherwise. I hope it's nothing more expensive like lambda probes or MAF sensor.


I'd also like to know if anyone has had problems from EOC:ing too much, like 70% of their distance.

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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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Old 09-29-2011, 02:29 PM   #2 (permalink)
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How old is your MAF sensor? It might need to be replaced also did you have the spark plugs replaced? Try cleaning the MAF remove the MAF and Clean it with electronics cleaning spray let completely dry before installing.
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Old 09-29-2011, 03:56 PM   #3 (permalink)
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Princess - '92 Mazda MX-3 GS
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The spark plugs are new, the MAF sensor otoh i think is as old as the car. I'll look at it tomorrow, thanks for the tip!

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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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