I'm in Texas in a safety and emissions county. I went for an inspection yesterday and failed for to high of NOx. So I seafoamed it and the second time around it failed again. For to high of HC and NOx. I also looked to see the check engine light and it was a code 65, and 45. Both indicators of running rich. So my question is for you experts, is how can I make it run lean, and reduce my NOx and HC emissions? I looked on the Internet bug found no reliable sources, some say use seafoam some say don't. Also some people say do the test when it's cold some say do the test when it's hot I'm confused. Any help is appreciated.

 

Did you get the truck good and warmed up before you ran it through? When mine required testing I would run it up the road 10 miles and back before. You want it to be good an hot because when the cat is hot is when its most efficient at burning off emissions. For example, one of the functions of the air injection system is to inject air into the exhaust stream to give the cat more oxygen ti help burn hotter.

Clear your codes and see if it throws another fault. If not get it good and hot and run it through. Otherwise your going to have to find out what's causing the eec to through those codes.

 

Thanks a bunch man! I was told by like 3 people the the lower the engine temp the lower the nox readings they all told me to let it cool before the test. Do you have any idea about the rich condition?

 

Pull engine vacuum l,test map and ect.

 

Clear the codes and see if they come back.

 

Test it how? Resistance test? If so do you have the ohm spec?

 

Could be something as simple as a plugged air filter. I don't know about Texas but here in Arizona right next door to most IM stations there is a private co. or mobile business that will retest free and garantee it to pass and if you don't have them fix it they can at least point you in the right direction.

 

http://oldfuelinjection.com/?p=46

45 Thermactor secondary air is misdirected.
65 Overdrive OFF switch was not cycled during KOER test (user error).

If your secondary air system is disabled or not functioning correctly, this could cause a rich condition.

 

I must have gotten the code information from the wrong place. So what Is this Thermactor secondary air you speak of? lol XD and the overdrive switch was not cycled during koer test?

 

And how do you clear the light on obd1? As far as I know leave the negative battery terminal off for 1 minute.