emissions problem....1989 GMC Sierra
Not sure what you guys can tell me, but wanted to pose the question.....
I tried to get my truck inspected today and found that it wont pass the NOx portion of the emissions testing. The truck doesnt smoke at all from the tail pipe and the oil pressure is around 30 on the dash gauge. No check engine light is on and it runs and drives really good with plenty of power, even with 253k miles on it. It does have a catalytic converter on it too.
What is the possible problem with the emissions?
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