Need help, failed smog - hydrocarbons too high - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

A17Z · 05-19-2005, 12:33 PM

I barely failed -
Hydrocarbons (HC)
MAX AVE MEAS
58 9 61 <------ 3 points too high! 15 mph
42 7 42 <------ at the max, just passed! 25 mph

I've been told that high HCs means there is too much unburned fuel. How do I reduce this!?

Before the test I already replaced the spark plugs, dist. cap and rotor and fuel filter. Oil was replaced recently about 1500 miles ago. Ran 91 octane. Drove the car for 30 minutes to the shop.

Last year when I smogged I had similar HC readings but I did acutally pass. So i'm thinking there has been a problem since then and it's bigger than the standard routine maintenance. Oh yeah I have a stock 98 S14 w/ KA.

What else can I do to get the hydrocarbons down?

05-19-2005, 12:33 PM	#1
A17Z Leaky Injector Join Date: Apr 2003 Location: LA, CA Posts: 142 Trader Rating: (0) Feedback Score: 0 reviews	Need help, failed smog - hydrocarbons too high I barely failed - Hydrocarbons (HC) MAX AVE MEAS 58 9 61 <------ 3 points too high! 15 mph 42 7 42 <------ at the max, just passed! 25 mph I've been told that high HCs means there is too much unburned fuel. How do I reduce this!? Before the test I already replaced the spark plugs, dist. cap and rotor and fuel filter. Oil was replaced recently about 1500 miles ago. Ran 91 octane. Drove the car for 30 minutes to the shop. Last year when I smogged I had similar HC readings but I did acutally pass. So i'm thinking there has been a problem since then and it's bigger than the standard routine maintenance. Oh yeah I have a stock 98 S14 w/ KA. What else can I do to get the hydrocarbons down? Last edited by A17Z; 05-19-2005 at 08:46 PM..

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