Failed Emissions
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Junior Member
Joined: Jun 2002
Posts: 42
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From: MD
Failed Emissions
I just failed emissions for hydrocarbons(everything else was o.k) I have a Hypertech chip,160 degree stat,12 degrees of base timing).The car sits most of the time. Do any of these have anything to do with hydrocarbon failure. HELP!!
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 16
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
HC = unburned fuel or oil
An ignition miss will cause it. If HC is high but CO is OK, chances are the fuel mixture is OK.
Define "tuned up"... you probably have at least one cylinder that isn't running at least part of the time.
An ignition miss will cause it. If HC is high but CO is OK, chances are the fuel mixture is OK.
Define "tuned up"... you probably have at least one cylinder that isn't running at least part of the time.
Member
Joined: Nov 1999
Posts: 244
Likes: 1
From: Illinois
Some of your mod's can increase HC, so do the following. Reset your timing to 0 deg. Install a 180 or better yet a 195 thermostat.
Retarded timing & higher coolant temps reduce HC emissions. You'll get more bang for the buck by retarding timing.
Retarded timing & higher coolant temps reduce HC emissions. You'll get more bang for the buck by retarding timing.
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