| Check your EGR system: the solenoid, the valve, the tubes (are they clogged). A clogged and/or failing system can cause high NOx. If you still have your AIV system, make sure you have the vacuum hoses to the correct places. --Will do. Check your timing. Too much timing can cause higher NOx. --Timing was read at the shop at 14 degrees. My timing light reads 15 degrees. Which spark plugs do you have? Use proper heat range plugs. --NGK PFR6B-11B As pieboy100 says, put your cats on. --Cats are on. I guess I should have them checked.
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