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High hydrocarbons

(1995 Chevrolet 2500 Pickup)
in Hagerstown, MD on May 09, 2018
Trucked passed emissions except for gas cap
Took truck back 1 month later and it failed
Hidrocarbons went from 10 - 765
Plugs and rotor were just changed but can't figure out as to why the hydrocarbons jumped so high
Catalytic converter passed so it can be ruled out for repair
Any suggestions ??
Dave
What seems to make the problem better or worse? Truck has No problems runs great
How long have you had this problem? 1 month
Tags: chevrolet, 2500 pickup
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Popular Answer
Hydrocarbons are simply raw or UN-burned fuel. Simply perform diagnostics on any item that could cause the fuel not to burn correctly. Start by checking for incorrectly installed or cracked spark plug. If they HC was good before the tune up then recheck the tune up work. Good Luck.
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on May 10, 2018
I replaced plugs and dis cap. The readings was the same a 3ed time.
A lot of items can contribute to this. Can you come by the shop and Ill listen to the engine and give you some advice?
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