Colorado emission failed
- Thread starter hkl0000
- Start date
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Was it up to temp (nice and hot, running for 30 minutes or so before the test) with good working O2 sensors?
Any engine light or codes popping up?
Any engine light or codes popping up?
In Colorado the passenger car CO is 15 grams per mile and the light truck limit is 20 grams per mile. So, the test result of 38 gpm seems way high? Here are some ideas from a quick search on what could cause a rich mixture.
Defective Oxygen Sensor
Leaking or defective Fuel Injectors
Restricted air filter (especially if high CO is present only at high RPM)
Vacuum leaks resulting in improper MAP sensor operation
Defective air mass or airflow sensor
Malfunctioning fuel evaporation system, purge valve, or gas cap
Defective Catalytic Converter
Defective thermostat (cooling system), thermostat stuck open
Oil contaminated with fuel, excessive miles between oil changes
Maybe do the easy stuff first: replace the gas cap gasket, clean the mass air flow sensor, replace the air filter, and check all vacuum hoses. Then retest at another facility, if possible.
Defective Oxygen Sensor
Leaking or defective Fuel Injectors
Restricted air filter (especially if high CO is present only at high RPM)
Vacuum leaks resulting in improper MAP sensor operation
Defective air mass or airflow sensor
Malfunctioning fuel evaporation system, purge valve, or gas cap
Defective Catalytic Converter
Defective thermostat (cooling system), thermostat stuck open
Oil contaminated with fuel, excessive miles between oil changes
Maybe do the easy stuff first: replace the gas cap gasket, clean the mass air flow sensor, replace the air filter, and check all vacuum hoses. Then retest at another facility, if possible.
I'd like to see your fuel trims...do you have a scan tool? Clean MAF and reset your adaptives aka disconnect battery. That will clear all the readiness flags though too but if your fuel trims are off due to dirtballed MAF you will be out of whack.
It will show in the data stream on any scan tool as long and short term fuel trim...
I think you would want one of these: http://www.scangauge.com/ A couple of mudders have a model of this installed that can also track tranny temperature. It is wired, but can clear codes and stuff.
You could try to get a local mechanic or even an auto repair parts place like Autozone, Koi, Oreilly's to walk out and do the scan for you.
You could try to get a local mechanic or even an auto repair parts place like Autozone, Koi, Oreilly's to walk out and do the scan for you.
Here is where the scan tool would plug into. It's on the driver side's foot well to the side of your pedals.
https://forum.ih8mud.com/100-series-cruisers/552194-torque-app-plus-bluetooth-adapter-my-100-a.html
https://forum.ih8mud.com/100-series-cruisers/552194-torque-app-plus-bluetooth-adapter-my-100-a.html
- Thread starter
- #11
All good now. Thanks for everyone for the help. I just clean the air sensor and used some seaform and drive it on the highway for 40 mins. Went to emission right the way. and it pass. Thank you
In related news, I passed my CO emissions yesterday in the new LC with flying colors 