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12-05-2010, 01:39 PM | #1 | |
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failed emisions
1990 cady fleetwood base model first test
hc:0.6 co:27.2 nox:2.67 replaced spark plugs, wires, map sensor, pcv valve, engine temp sensor, throttle position sensor, oxygen sensor, cleaned throttle body, and replaced worn vacuum lines got emissions down to hc:0.61 co:20.95 nox:2.67 i needed to get them under these numbers hc:1.0 co:12.0 nox:2.5 i dont know where to look im not good with emissions any suggestions |
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12-05-2010, 02:22 PM | #2 | |
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Re: failed emisions
I am no huge expert on emissions either. But I suspect since the HC are within limits your engine is burning the fuel efficiently.
The high CO indicates a catalytic converter that is not functioning properly and the high NO means your EGR system may not be working properly. |
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12-05-2010, 03:31 PM | #3 | |
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Re: failed emisions
How old are the catalytic converters on this car?
See http://www.catalyticconverterwarehouse.com Make sure car is at normal operating temp, when doing the emission test. |
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12-05-2010, 11:42 PM | #4 | |
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Re: failed emisions
if the cat is bad it is not plugged up but i would bet it is original equipment
what all is part of the EGR system I know the Egr valve was replaced last year does anyone know 1) how to tell if that cat needs to be replaced and 2) where i can get a vacuum tube diagram to just go ahead and replace all the vacuum lines thanks for the help so far |
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12-06-2010, 11:36 AM | #5 | |
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Re: failed emisions
Egr is a system that directs some exhaust gas into the combustion chamber this reduces nox, the cat also helps in this process, make sure the egr works.
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12-06-2010, 08:10 PM | #6 | |
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Re: failed emisions
OBDII systems has a down stream H02 sensor to tell the ECU/PCU if the catalytic converter is working, however if plugged it doesn't.
Your car has OBDI system, Any muffler shop should beable to test your catalytic converters. |
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