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10-24-2005, 07:02 PM
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#1 |
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Registered User
Join Date: Jan 2005
Location: Hixson TN.
Posts: 74
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Emissions
Just got back form testing and it failed the co% on the 50/15 test (50 pounds resistance @ 15 mph) 3.37%, 2.05% allowed. Hydrocarbons are good as is the N.O.
My timing is 12 initial 12 vacuum and 12 centrifuge all in around 2800 rpm. I'm running a 180 thermostat. The hydro's tell me my cats are good. Spark plugs are good and I rebuilt the dizzy. I'm thinkig its the timing or the temp. hopeing to get some advice before I dive into it. thanks I've got a jet kit for my carb if leaning the cruse mode will help.
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82 C-10 Scottsdale LB owned since 89 350 crate vortec heads Crane 1.6 full rollers edelbrock 1406 edelbrock performer eps intake dynomax headers/flowmaster 70's BTO 700r4 level 3 custom 2 piece driveshaft 12 bolt gov loc w/3.08 Last edited by Trimman; 10-24-2005 at 07:05 PM. |
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10-27-2005, 09:03 AM
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#2 |
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No No
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
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Re: Emissions
Well some helpfull hints that probably will get you past the sniffer.
Go to a stock t-stat for the time being, 195*. Retard the timing back to factory specs 6* or so should do it. Go in with a fresh oil change. Before you take the truck in, drive it long enough to get it to operating temp 200*+. Do this and you should pass with no problems.
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1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler |
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10-27-2005, 10:25 AM
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#3 |
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Registered User
Join Date: Jan 2005
Location: Hixson TN.
Posts: 74
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Re: Emissions
Thanks for the tips. I went 1 stage lean on the carb and passed with flying colors plus it should get better mileage!
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82 C-10 Scottsdale LB owned since 89 350 crate vortec heads Crane 1.6 full rollers edelbrock 1406 edelbrock performer eps intake dynomax headers/flowmaster 70's BTO 700r4 level 3 custom 2 piece driveshaft 12 bolt gov loc w/3.08 |
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