Sometimes you want to lean the fuel/air mixture for best power—a high density altitude situation, such as taking off from a remote mountain airstrip, is a good example.

While black smoke means a rich fuel mixture, white smoke means a lean one. However, while a lean fuel mixture is similar to a ...

There's an old saying in engine tuning that when adjusting the mixture of your engine you can be too rich a bunch of times, but only too lean once. With that in mind, determining the air-fuel ...

Using the Computer Command Control (CCC) system an oxygen sensor monitors for a rich or lean air/fuel mixture in the exhaust system. This value is sent to the engine controller and, ...

A rich fuel mixture can be caused by a malfunctioning oxygen sensor, mass air flow sensor, engine air Intake sensor, coolant temperature sensor, throttle position sensor, faulty fuel or ignition ...

Ever been told your car is running lean? It means the engine is receiving too much air or not enough fuel during combustion. You see, your car's engine needs a very specific balance of air and ...

It's a common bit of tuning advice that a too-lean air-fuel mix will make your engine overheat. But there's more to it than that. By Bob Sorokanich Published: Jan 2, 2019 ...

A lean mixture contains more air than that, more than can actually be used in combustion. The opposite of a lean ratio is a rich ratio, which has less than 14.7 parts air and thus too much fuel.

Running rich means that there is too much gas in the air-fuel mixture. This can happen for a variety of reasons, but in a normally functioning system, the ECU will tell it to cut back on the fuel ...

Caution!What most A/F ratio devices actually measure is really the amount of residual oxygen (for lean mixtures) or unburned hydrocarbons (for rich mixtures) contained in the exhaust gas.

If there's more oxygen and less fuel—say a ratio of 16:1—then the mixture is considered lean. Stoich is basically the 50-yard line between rich and lean. If the fuel carries its own oxygen or ...