*When was the last time you change your spark plugs?
*Last time you ran fuel system treatment through your tank?
*Has the timing been change on your car since factory? If so advance the timing this should help the HC count.
*Oxygen sensors running good? maybe causing the car to run rich.
* does your car get to normal operating temp? if not you may have a lower temp rating thermostat causing the car to stay in open lope longer causing the car to run to rich.
*Overall HC is to much fuel or misfire causing unburnt fuel.
*Also give the car a few hard Wide open throttle runs while driving clean the car out doesnt hurt.
*also possible your cats are bad. thunderbolt racing has cats for $40 each will get you to pass.
*air filter is clean?
* any vacuum leaks? this also can cause high HC
* head gasket leak?
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2000 Pewter Trans am, M6, SLP Lid,LS6 intake,Kooks 1 7/8" Long tube header,Classic Chambered Powersticks, hurst,off road X-pipe, Strano springs & Koni's, Monster level 2 clutch, HPtuners wide band tuned and a homemade ram air box sealed off.
Last edited by DaSkinnyGuy; 08-01-2010 at 10:09 PM.
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