This truck is running lean. I can`t seem to get to go any richer. Nox is 945 at 15 mph max is 740 nox is 908 at 25 mph max is 775. I added propain to the engine and nox was under control. there is no EGR. timing is not adjustible and it is in spec. I ran a com...

FIX posted 6/8/2002

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