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August 26th, 2006, 11:48 AM
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Emissions test
Guys, how can I lower my HC number?
Thanks, Mike
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86 GN, 62 mm TB,145 speedo, Thrasher 92,Under drive pulley's, Hooker Exhaust, 3"BGC down pipe,160 stat, scanmaster, Gauges, pinion snubber,Eaton posi, Eric Shertz Built tranny, Vacuum brakes,SMC Alky, and some other stuff. Doing Resto     
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August 26th, 2006, 02:45 PM
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It depends, if HC is coupled with high CO then it is possible that the mixture is too rich, but if HC is coupled with real low CO, then you may have a misfire situation or lean or ignition. Please provide all the readings when asking a question like this, because all the emission gases affect each other.
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87 Buick GN 55 Chevy 3200 Heavy 1/2 Ton 99 Pontiac Bonneville Joe
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August 27th, 2006, 12:30 PM
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Ok, Here are my numbers from last year's inspection:
HC 0.80 CO 7.0 NOx 0.64 Thanks...
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86 GN, 62 mm TB,145 speedo, Thrasher 92,Under drive pulley's, Hooker Exhaust, 3"BGC down pipe,160 stat, scanmaster, Gauges, pinion snubber,Eaton posi, Eric Shertz Built tranny, Vacuum brakes,SMC Alky, and some other stuff. Doing Resto
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August 29th, 2006, 11:39 PM
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emissions are pig rich
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87 Buick GN 55 Chevy 3200 Heavy 1/2 Ton 99 Pontiac Bonneville Joe
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August 30th, 2006, 08:35 AM
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Ok, So If I lower my FP I should be ok?
Thank you
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86 GN, 62 mm TB,145 speedo, Thrasher 92,Under drive pulley's, Hooker Exhaust, 3"BGC down pipe,160 stat, scanmaster, Gauges, pinion snubber,Eaton posi, Eric Shertz Built tranny, Vacuum brakes,SMC Alky, and some other stuff. Doing Resto
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August 30th, 2006, 11:34 PM
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since you are running an open loop chip, are those emissions readings without a cat? If so, You'll want blms near 128.
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87 Buick GN 55 Chevy 3200 Heavy 1/2 Ton 99 Pontiac Bonneville Joe
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September 2nd, 2006, 09:54 PM
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These numbers are with a cat.
Mike
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86 GN, 62 mm TB,145 speedo, Thrasher 92,Under drive pulley's, Hooker Exhaust, 3"BGC down pipe,160 stat, scanmaster, Gauges, pinion snubber,Eaton posi, Eric Shertz Built tranny, Vacuum brakes,SMC Alky, and some other stuff. Doing Resto
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September 6th, 2006, 11:58 PM
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Then take a little fuel out of it (with a fuel pressure adjustment)
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87 Buick GN 55 Chevy 3200 Heavy 1/2 Ton 99 Pontiac Bonneville Joe
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September 7th, 2006, 07:43 AM
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I will. Going for my inspection next week.
Thank you for your input Joe. Mike
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86 GN, 62 mm TB,145 speedo, Thrasher 92,Under drive pulley's, Hooker Exhaust, 3"BGC down pipe,160 stat, scanmaster, Gauges, pinion snubber,Eaton posi, Eric Shertz Built tranny, Vacuum brakes,SMC Alky, and some other stuff. Doing Resto
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September 21st, 2006, 12:27 AM
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I failed my test two times, and I had a cat and the Turbotweak emissions chip. The third time I turned the fuel pressure down, so the car barely ran, and it passed right away. I turned it down past the point where the computer could compensate.
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89 TTA #145 Festival car #118 34k miles 11.5@116.11 Best 60' 1.52
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