Lean running conditions are often the result of leaks. Throwing parts at the problem gets expensive very quickly. If you haven’t used the coils yet, do some more tests before replacing them to make sure it isn’t going to be a waste of money. I suspect the ignition coils are also not at fault because your Jeep has a coil on plug setup, meaning each cylinder has its own ignition coil. If you’re running lean on one bank, this likely rules out the spark plugs as the root cause. A good scan tool may be able to give you more info, for example if you’re only running lean on one cylinder bank and the other bank is fine. Once this happens, a costly catalytic converter replacement will be necessary.ĭo you think you’re running lean on one side by the condition of the spark plugs or data from an OBD2 scanner? If the vehicle hasn’t been scanned yet, I would do that. If it continually has to burn the excess fuel, it will eventually cause clogging up of the catalytic converter and degradation of the honeycomb design within it. This is known as carbon deposit and will affect the performance of your engine.Īs noted earlier, the catalytic converter’s job is to burn excess fuel before it reaches your tailpipe. When running rich, the bottom of your spark plugs can get fouled up with a dry, black soot. Two big signs of your engine running rich have to do with the condition of your spark plugs or catalytic converter. Sometimes the vibration in the engine can be felt while driving. While the car is not moving (idle), you may notice that the RPMs on the tachometer behave erratically, slightly jumping around. This means the vehicle will actually vibrate and feel a bit rough as the engine is running. #6 – Rough Engine IdleĪ fuel mixture that is rich could be the cause of rough idling. If you were to just breathe these fumes in for a few minutes, it could cause serious neurological damage. In addition, too much carbon monoxide being expelled needs to be taken seriously because it can put your health at risk, especially if it starts to seep into the car while driving. This is often the case why a vehicle will fail to pass a state emissions test. While an exhaust naturally expels a certain level of carbon monoxide, if your engine is running too rich, this level will be higher than usual. This could only mean that the mixture of fuel and air either has too much fuel or too much air. You may have compression that is normal and a spark that is normal but still have low engine power. So, weak engine performance would mean that a problem must exist in one of these areas. Without these four requirements, you won’t have power being generated from your engine. Power in a gasoline engine comes from a combination of fuel, air, compression, and then a spark. Note that in cold temperatures, a car will generally run a bit richer than usual so if your gas mileage is slightly worse in winter than summer, this is actually normal. You’re essentially burning more fuel than you actually need for the car to properly operate. If you notice that you’re not getting as much gas mileage out of your tank as you used to get, it could be a sign of your engine running rich. See Also: 6 Reasons Your Oil Smells Like Gas #3 – Bad Fuel Efficiency The job of the catalytic converter is to burn off the extra fumes but when the fuel mixture is way too rich, even the cat can’t burn the excess off. This is due to excess fuel not being burned properly in the combustion process and escaping into the exhaust manifold and ultimately out of your tailpipe. One of the first things you may notice is a strong smell of fuel or rotten egg smell from the exhaust. These sensors tell the vehicle’s ECU there is a problem which then causes it to turn on the check engine light. The manifold absolute pressure is used to watch the engine’s air-fuel ratio. There are a lot of instruments used in the engine control unit (ECU) including oxygen sensors, the manifold absolute pressure, and the mass air flow sensor. If you use an auto diagnostic tool to scan the trouble code from your check engine light and it shows P0172, this means the exhaust gases have an abundance of gasoline in them as they are coming out of the combustion chamber. Top 7 Symptoms of an Engine Running Rich #1 – Check Engine Light On
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