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i recently took my 1992 buick regal custom 3.1 litre 4 door in for an E-test and passed all the requirements except for a high NOx ppm what can i do to fix this problem so it is completely passible for driving

Answers from the Automotive Experts

Lori Johnson, Owner and Instructor at Ladies Start Your Engines Dear Jeff, High NOx means that your combustion chamber is burning hot.You could check your you have pinging? This could indicate a timing problem. Carbon deposits are possible too and probably the easiest to fix. You could de-carbonize the engine. This involves having someone inject a cleaner into the system, then taking the vehicle out for a drive and then changing the oil. Make sure you take your vehicle only to a technician who is ASE certified. You can find one in your area by going here:

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