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Re: 89 Failed Vehicle Emissions Test Twice HELP
High HC means high amounts of unburnt fuel. This can be from a faulty plug, wire, ignition coil, poor cylinder compression, faulty injectors...
High NOX can also mean that your timing is set too far in advanced (if you can even adjust it), your EGR isn't working properly, vacuum leak, etc...
Your cat could also be poisoned and no longer functioning correctly.
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Vinyl adds horsepower, right?
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