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There is no Oil lubricating your engine at a cold start up, so a rich mixture is used to try eliminating any scouring on your (internal) engine components.
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∙ 13y ago
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How can you tell if your coolant sensor is bad What are some of the signs?
Poor starting due to over rich mixture (hot engine) Poor starting due to weak mixture (cold engine) Cooling fan(s) coming on when the engine is cold Sensor can be checked using an ohm meter if you have the data.
What is the copression ratio of patrol engine?
12:1 for rich mixture and it is 15:1 for lean mixture
Can a rich air fuel mixture cause engine blow by?
Yes
What does engine running rich or lean mean?
An engine runs by the combustion of a mixture of oxygen and gasoline. If this mix has too much oxygen, it is said to run lean. When the mixture has too much gasoline in relation to oxygen, it is running rich.
What is engine choke?
Choke is a mode of air/fuel mixing that causes a rich mixture (meaning a lot of fuel). This is often used upon starting the engine. it is applied manually in older cars, but newer cars have an ECM to control such functions.
Why would there be oil in spark plug area?
Improper timing, mixture is rich, engine wear.
What colour of the exhaust gas emitted from a petrol engine that is running very rich is likely to be?
Black smoke indicates a rich fuel mixture.
What can cause a bad catalytic converter?
Fuel/air mixture too rich, engine misfire, or damage.
What is the effect of air fuel ratio on detonation in internal combustion engine?
A leaner fuel mixture burns hotter than a rich mixture. so a leaner mixture will be more prone to detonation than a richer mixture.
Why do old cars have a choke?
Older (pre computer) cars have a mechanical choke to richen the mixture for cold starting. Cold engines need a fuel rich mixture. Later model cars do this by shooting addition fuel into the engine on a cold start. That signal is sent electronically to the injectors by the computer.
Your engine runs always at rich mixture. what are the possible reasons and how to solve this problem?
The year, make, model and engine size would help us help you.
Will a bad oxygen sensor in a 1983 olds 307 cause it to run too rich?
The purpose of an oxygen sensor is to sense the amount of oxygen in the exhaust gas. If oxygen is present, an insufficient fuel mix has been added to the cylinder to make it fire. The oxygen sensors job is to send a signal to the computer that regulates the intake mixture to richen the mixture until enough fuel has been added to combust all of the oxygen in the mixture, ensuring the proper mixture. A lean fuel mixture will take longer to burn than a rich mixture due to the lack of fuel in relation to oxygen. The engine will still opperate though poorly, and when the piston moves up in the cylinder, it will be pushing burning gasses through the exhaust port. This is normally what causes the engine to run hot on a lean mixture. A failed oxygen sensor could easily cause an engine to run rich or lean. Some vehicles may have programs to automatically richen an engine's fuel/air mixture to protect the engine from premature mechanical failure in the event of a failed oxygen sensor. A rich mixture will not likely damage an engine, just your pocketbook.
