What happens when a car fails the NOx test?
The car has failed the NOX portion of its emissions test. This is probably the most common failure I’ve seen, but that term on the emission test seems to scare people. But it is usually an easy failure to fix. The following description may seem to go against logic at first, but it does explain what is actually happening to make your car fail.
What happens if your car fails an emissions test?
Failing the Emissions Test. This means no license plates, which means no driving. So in order to obtain a smog test certificate, you must get the vehicle repaired. After failing, you’ll receive a report from the inspection station attendant detailing needed repairs. File this in a safe place. You’ll want to present it to the car repair shop,…
What causes a high HC reading on an emissions test?
Let’s start by understanding what things cause a high HC reading. A high HC reading means the test found high HC (hydrocarbons) in your emissions. In other words, too much gas is left in the exhaust after combustion.
What happens if my car fails the smog test?
Failing the Emissions Test. Without a passing grade, you cannot register the vehicle. This means no license plates, which means no driving. So in order to obtain a smog test certificate, you must get the vehicle repaired. After failing, you’ll receive a report from the inspection station attendant detailing needed repairs.
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.
What makes a car fail an emissions test?
Newer cars have a computer, called the Power Train Control Module (PCM), to precisely meter the gasoline to the incoming air flow. It does so by electronically activating and then constantly fine tuning the fuel injectors. Either way, an out-of-whack fuel injection system, or engine management system as we refer to them, is the culprit.
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.