cali smog issue
ive got an 84 w150 it failed smog in one area and that was on emissons under the "NO (ppm)" on the 25 mph test. im wanting to know what that part of the test is and also what can cause it to b high. if someone can help me with this id really appreciate it. i really dont want to retire this old girl as shes been amazing for me until smog comes around
when was the last time it had a new air filter, plugs, wire, cap and rotor? could also try running premium gas. i usually recommend that anyone going in for emissions testing run premium gas for a week before there emissions test and make sure it gets nice long drives with that premium gas.
this is from California own website
NO (PPM): Oxides of nitrogen (more commonly called NOx) are odorless gases that help form smog, and give smog its characteristic brown color. NO is produced when temperatures in the combustion chambers exceed 2500 degrees Fahrenheit. Excessive engine temperatures could be caused by a lean fuel mixture, by retarded timing, by carbon buildup inside the combustion chamber, or by a malfunctioning engine cooling system. The function of the EGR System is to reduce NO. Unhealthy levels of NO emissions result in a vehicle failing its Smog Check. NO is measured in parts per million (PPM).
if you read that page, there is a way to get your vehicle declared Smog Exempt
there is a way, but you have to jump through certain hoops, a certain way
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