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Help: Failed CO test in MA 1990 300SE
Failed MA Dyno test
Car has been very well maintained.
First Test, Car was cold
Grams Per Mile
Reading Limit
HC 1.66 2.00
CO 56.32 30.00
NOx 1.29 3.00
2nd test car is Fully warm and HOT
Grams Per Mile
Reading Limit
HC 1.39 2.00
CO 33.96 30.00
NOx 1.20 3.00
Oil was replaced about 800 miles ago, plug have about 35K on them
I was thinking of just changing the oil and plugs then trying again.
Any thoughts?
What caused high CO readings? I thought maybe the cats need to be replaced but since the HC is OK than I don't think that will help?
Thanks in advance.
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