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Anonymous Posted on Mar 16, 2015
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Reason for failing emmision hc ppm idle on a 1996 chevy suburban 454 truck

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Samuel Gagnon

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  • Posted on Mar 16, 2015
Samuel Gagnon
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Hi!

First of all, HC (Hydrocarbon) are the residue of petroleum based product combustion. If your HC reading are higher than the OBD2 legal limit (220 ppm), the most common causes could be a leaking fuel injector, abnormal oil consumption, a faulty Oxygen sensor or worn out spark plug / distributor cap / spark plug wire. To be honest, I would need more accurate details such as NOx ppm, CO ppm, CO2 ppm and Oxygen ppm and if there is any repair that have been made on the car recently to give a proper diagnostic.

Warm regards

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