This is the test for Texas..
Two Speed Idle Test
The Two-Speed Idle test is a tailpipe emissions test. This means the analyzer measures exhaust emissions directly from the vehicle's tailpipe with the engine idling at a high and then low speed. TSI measures most of the common factors contributing to the formation of lung damaging ground level ozone.
A vehicle will fail the test if there are excessive amounts of hydrocarbons or carbon monoxide. TSI is used for older vehicles that are not equipped with the advanced on-board diagnostic computer system.
A Few Reasons Why A Vehicle May Fail the ASM2 Test
Excessive Hydrocarbons (HC):
High hydrocarbon emissions result when fuel in the engine does not burn completely. HC in the presence of oxides of nitrogen (NOx) and sunlight may form ground-level ozone, a major component of urban smog. Check the following:
Internal Engine Problems
Faulty Air Pump
Ignition System
Exhaust Gas Recirculation System (EGR)
Catalytic Converter
Gas Cap
Excessive Carbon Monoxide (CO):
A rich fuel mixture can cause high amounts of carbon monoxide, which can occur when there is too much or too little air reaching the combustion chamber. Check the following:
Misadjusted Carburetor
Faulty Fuel Injection System
Worn Rings/Valve Guides
Air Pump System
Excessive Oxides of Nitrogen (NOx):
High NOx can occur when there is excessive temperature in the combustion chamber or a damaged catalytic converter.
Check the following:
Air Injection System
Exhaust Gas Recirculation System (EGR)
Combustion Chamber Deposits
Oxygen Sensor
Catalytic Converter
Diagnostics for NOx failures
OVERALL
Check for causes of high combustion temperatures. Primary systems that affect NOx include:
Mixture control (lean)
EGR
Ignition
Check Catalytic Converter
[This message has been edited by Merlinhaggard (edited 12-25-2013).]