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Old 07-08-2004, 07:58 PM
Kebowers Kebowers is offline
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Join Date: Jul 2000
Posts: 638
failed NOx emission test

The oil consumption has probably killed the catalyst. The phosphorus in the oil (antiwear additive) is a permanent poison. 1qt/1000 miles is a LOT of oil consumption for that small engine.

You MIGHT try a high speed/high load 'burn-off' attempt on the catalyst before changing it. Also be sure the timing is right on, the EGR valve, plumbing, and passages are clean and working properly.
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