What is fuel air commanded ratio?
This is the desired air/fuel ratio, a command issued by the PCM. Greater than 1.0 is the command for a rich air/fuel ratio, and less than 1.0 is a command for a lean mixture. Under steady-state conditions, this command constantly rises and falls to alternate between rich and lean mixture for proper catalyst operation.
What happens if air fuel ratio is wrong?
If the ratio is too rich or too lean, the engine will not burn optimally burn the air-fuel mixture which can cause performance issues or use up too much fuel. The ideal air-fuel ratio that burns all fuel without excess air is 14.7:1. This is referred to as the “stoichiometric” mixture.
How do I fix my P219A code?
How To Correct P219A Bank 1 Air/Fuel Ratio Imbalance
- You must fix the leakage in the engine vacuum.
- Make sure to mend the faulty oxygen sensor/s.
- Repair or replace the quirky wiring and/or connectors.
- Rehabilitate the leakages in the engine exhaust.
What should my fuel trims be at idle?
Ideally, long-term fuel trims should be at, or close to 0% when the engine is running at a steady speed. However, while changes to the engine speed will (and must) produce changes in the long-term fuel trim value, this value should return to a point close to 0% when the engine speed steadies.
What is a good air/fuel ratio?
In a perfect world, all gasoline engines would run the ideal air-fuel mixture of 14.7 parts air to 1 part fuel. This target mixture, which is referred to as the stoichiometric air-fuel ratio, is a compromise between optimum fuel economy and optimum power output.
What is a good AFR reading?
CRUISING: 14 AFR Most stock to slightly modified engines will run just fine at an AFR of 15 and yield better MPG. If you prefer better PERFORMANCE then we suggest to run an AFR of 14 or even richer to around 13.
Is P219A serious?
A P219A code is considered to be serious if it indicates that one or more of the components is faulty. This code will not cause any immediate engine damage, but the next time the engine fails to start, it may be due to this same fault. The vehicle should be serviced as soon as possible.
What should an O2 sensor read at idle?
The voltage generated from the O2 sensor should be from 0.1V to 0.9V, with 0.9V on the rich side and 0.1V on the lean side. If your readings are within this range, the O2 sensor is functioning properly.