Two possibilities come to mind, strictly theoretical since I don't work as a mechanic, I am an engineer: 1. Running too rich. This lowers the combustion temperature which keeps NOX low but the unburned hydrocarbons and incomplete combustion result in high HC and CO emission. Check O2 sensor, airflow/airmass sensor, computer codes, injectors, etc. 2. An alternative theory is that the catalyst is no longer effective, or perhaps if it has air injection, the air pump is no longer doing its job - the catalyst cannot burn off the pollutants because there is no oxygen available in the exhaust stream or the material is no longer usable.
How do you get 1000000 robux for free?
Give me food and I will live give me water and I will die what am I?
How do you spell water with 3 letters?
What countries have only three syllables in their name?
WHAT IS THE EXPECTATION ON THE SUBJECT NSTP AND TO THE INSTRUCTOR AND CLASSMATE?
What patterns are involved in multiplying algebraic expressions?
What are the advantages of using a two-way chart?
Bakit hindi kasama sa pinagpilian si andres bonifacio bilang bayani?