Thread: Smog Question.
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Old 11-11-2010, 09:38 PM   #3
SeanPlunkSeanPlunk is offline
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Quote:
Originally Posted by jedhead View Post
I would check the EGR system. Faulty EGR can cause the NOX to be high. Also if you have too much timing advance can cause elevated NOX.

Bob
Stock tune. I'm thinking EGR.
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