Insufficient or too much fuel will result in your car running rich or running lean.
Diesel and gasoline are the main kinds of fuel used to run most today's cars. The proper function of the car requires a right amount of fuel mixed with a proper amount of air burned in the engine.



If the ratio significantly changes, it will cause numerous negative effects on your car

The perfect air fuel mix of 14.7:1 (1 part fuel to 14.7 parts air) called “stoichiometric fuel ratio." However, most engines cannot reach this gold ratio. Instead, they usually run a little richer, especially when cold, under a load or when accelerating. If the ratio significantly changes, it will cause numerous negative effects on your car.

In case there is not enough air and too much fuel, the car “has a rich mixture or “is running rich”. A rotten egg or gassy smell will release from the exhaust resulting in black smoke and a burning effect to your eyes. That also makes the car run hot and causes a clogging up of the catalyst leading to the honeycomb’s degradation.

In contrast, if there is not enough fuel and excessive air, the car is "running lean" or "has a lean mixture" will cause jerking.


https://www.youtube.com/watch?v=gPWI8QTRg9g
Air/Fuel Ratio - How Does Being Rich/Lean Affect Your Engine?

Both running lean and running rich will cause poor fuel mileage and engine damage. An amber check engine light will appear alerting drivers to the "system too lean" or "system too rich."

Following is the reason why your car gets a rich mixture or lean mixture:

Reasons for a rich mixture

[center]Bad Engine Coolant Temperature (ECT) Sensor
Bad Mass Airflow sensor
Retrofitted cooling system (Thermostat removed, double cell radiator, fan running direct)
Faulty ECU
Bad Mass Airflow sensor
Stuck open injectors
Bad oxygen sensors
Dirty air filter[/center]

Reasons for a lean mixture

[center]Vacuum leak
Bad fuel pressure
Pump regulator
Stuck open EGR valve
Insufficient fuel[/center][/b]

Source : https://naijauto.com/car-maintenance/what-is-car-running-rich-and-car-running-lean-361

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Noted

Nice one bro

really an auto educative post.
Thanks for sharing.

I no know. Ask Google no ask am e Don dey epp APC lie ask God he will show you the way and answer

Informative..

What is stuck open injector?

thats why when a car is getting old or poorly used. you will have so many problem you cannot trace. its because so many things got missing which ordinarily most Nigeria machinic and car users will think removing them doesn't mean. the white men that put them there are not fools.

when you are buying a car and the engine have been roughly tempered with by Nigeria mechanic and some engine component is missing.. run for your life. those things are there for a reason.

Please what does premium gas mean? Is the normal petrol we buy every day premium?

Please, someone should explain to me how to get the radiator fan of my peugeot 206 back to factory settings.

I discovered that the fan was directly connected to power, so that once I put on the engine (ON ii position) the fan starts running and stays on permanently.

I took it to two electricians over the weekend and was told I should leave it that way, that I can't correct it. I'm thinking they didn't know how to go about it. The engine temperature hardly gets to 70degree, even after 20 mins of city driving.


Will be glad to get a step by step procedure, if possible, so I could guide someone to help me. Thank you all.

dandollar1:
Please, someone should explain to me how to get the radiator fan of my peugeot 206 back to factory settings.

I discovered that the fan was directly connected to power, so that once I put on the engine (ON ii position) the fan starts running and stays on permanently.

I took it to two electricians over the weekend and was told I should leave it that way, that I can't correct it. I'm thinking they didn't know how to go about it. The engine temperature hardly gets to 70degree, even after 20 mins of city driving.


Will be glad to get a step by step procedure, if possible, so I could guide someone to help me. Thank you all.

will not advice U do on ur own... pls try get a competent mechanic to help check the engine.
1. b4 returning fan to default settings kindly ensure the state of your thermostat if its still in d engine or not. if its not... pls get a good one make surenU replace the thermostat.
2. if the thermostat has been fixed then return the fan to d normal settings. pls make sure U get a competent mechanic.