 OT: My tow rig failed emissions! |
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| Eddie914 |
 Aug 9 2005, 02:30 PM
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Unregistered  |
My tow rig failed emissions today in Seattle!
1983 Chevy 454 with a Quadra jet pushing a 27 ft motorhome chassis. It failed the Carbon Monoxide at idle test. HYDROCARBON (ppm) Cruise Limit: 220 Cruise Emissions: 33 Idle Limit: 220 Idle Emissions: 128 CARBON MONOXIDE (%) Cruise Limit: 1.2% Cruise Emissions: 0.75% Idle Limit: 1.2% Idle Emissions: 4.78% Unfortunately the idle mixture screws are sealed on this carburetor (for the time being). The air pump has been removed. What is interesting is that since I replaced the heads to rectify the badly worn valve seats the HC has gone substantially down and the CO has gone substantially down. Are the HC and CO inversely proportional? Should I lean it out? Should I richen it up? … or should I just shoot it? Thanks Eddie |
 
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| Joe Bob |
Aug 9 2005, 05:08 PM
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Retired admin, banned a few times  Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
So why is the air pump removed? The pump dilutes the exhaust stream. HC and CO can invert due to lean/rich conditions. BTW...In CA missing equipment is a fail, do not pass GO or collect 200 dollars.
Best to find a shop that will let ya play with the timing while having it on the scope. The only two other things is to drill out the adjustments on the carb and/or reinstall the air pump. |
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Posts in this topic
Eddie914 OT: My tow rig failed emissions! Aug 9 2005, 02:30 PM
Brew Carbon monoxide is the incomplete burn of carbon m... Aug 9 2005, 04:43 PM chilli Make sure aircleaner element is clean or brand new... Aug 9 2005, 05:06 PM Cap'n Krusty Aug 9 2005, 05:21 PM MecGen http://www.914world.com/bbs2/h... Aug 9 2005, 05:36 PM Tom Perso Put the air pump back on... Aug 9 2005, 05:51 PM lapuwali Strictly as a function of AFR, HC and CO both fall... Aug 9 2005, 05:54 PM bondo How's your thermostat? A motorhome will have a... Aug 9 2005, 07:18 PM Eddie914 ERROR!
Since the head replacement, the CO wen... Aug 10 2005, 12:37 AM
messix get a carb rebuild kit and replace the float. q-je... Aug 10 2005, 12:49 PM |
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