Smog Test (Hydro Carbons)
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Joined: Mar 2005
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From: San Diego CA
Car: 83 Trans-Am (Recarro)
Engine: 305 4bbl
Transmission: 5 speed manual
Smog Test (Hydro Carbons)
What part or parts are involved with HC? I bairly failed a smog test today just in the HC catagory during the 25 mph test. I got a new caty converter 3 months ago, so what other parts help with HC?
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Joined: Dec 2003
Posts: 230
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From: VA, USA
Car: '84 Camaro SC/ I-ROC Body Conversio
Engine: Rebuilt 350 5.7L, Edelbrock 750cfm
Transmission: Re-built 700-R4
Axle/Gears: Moser, 3.73
Air pump, Evap Canister, CAT, Oil Change, etc.
HC is basically raw fuel so anything that'll help the car run better and burn it up before it exits the tail pipe will bring it down. A new CAT should've done the job though. If you gave it a small vacuum leak it would bring HC down but might shoot NOX up, so be careful.
But I'm just an emissions insp., what do i know
HC is basically raw fuel so anything that'll help the car run better and burn it up before it exits the tail pipe will bring it down. A new CAT should've done the job though. If you gave it a small vacuum leak it would bring HC down but might shoot NOX up, so be careful.
But I'm just an emissions insp., what do i know
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From: stockton, CA
Car: Camaro RS/SS
Engine: 5.7 LS1
Transmission: 4L60E Transgo shift kit, 3500 stall
Axle/Gears: 4th Gen Rear 3:42
I had the same problem about 2 weeks ago. It turned out to be the cat even though i replaced about 4 months ago. They guy and the muffler shop said that he could put a longer cat that would heat up more. He just charged me the difference between the two cats. After that i passed smog
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