What causes a GM fuel injection engine to fail NOx?

engines failing NOx caused by lean condition. General Motors Multiport Fuel Injection engines may fail emissions standard testing due to excess Oxides of Nitrogen levels in the exhaust gas.

Why does my GM MPFI fail NOx test?

GM MPFI 3200, 3800, engines failing NOx caused by lean condition. General Motors Multiport Fuel Injection engines may fail emissions standard testing due to excess Oxides of Nitrogen levels in the exhaust gas. Here are some steps to determine and correct the cause of high NOx emissions.

When did I get my Malibu LS inspected?

I have a 2011 Malibu LS that I purchased new in September of 2011. On Saturday, Sept. 14 I brought it in for it’s annual NY state inspection. The car runs fine and there are no error codes or visible problems. It passed inspection without any problem in 2012.

When did I buy my new Chevy Malibu?

engines failing NOx caused by lean condition. General Motors Multiport Fuel Injection engines may fail emissions standard testing due to excess Oxides of Nitrogen levels in the exhaust gas.

Why does my General Motors multiport fail emissions?

General Motors Multiport Fuel Injection engines may fail emissions standard testing due to excess Oxides of Nitrogen levels in the exhaust gas. Here are some steps to determine and correct the cause of high NOx emissions. Understand that NOx is produced in the combustion chamber at temps higher than 2500F.

What causes high No ( Nox ) in a car?

Nitrogen Oxide or NO is created when an engine’s combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitric oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitric oxide. 1.