Is Unstable Idle Related to Engine Oil?

1 Answers
DelKaleb
07/30/25 1:02am
Unstable idle is not related to engine oil. The reasons for unstable idle are as follows: Spark Plug Malfunction: Weak sparks caused by individual spark plug malfunctions can also lead to carbon buildup on spark plugs. Carbon deposits can be cleaned to restore spark plug activity, but some spark plugs may experience performance degradation as they approach the end of their service life. Fuel Line Blockage: Blockages in the fuel line, represented by the fuel injector, or intake manifold malfunctions can result in insufficient fuel supply pressure. This leads to poor fuel atomization, causing an imbalance in the air-fuel mixture and incomplete combustion, which in turn results in related malfunction symptoms. Sensor Malfunction: Malfunctions in related sensors can prevent the ECU from accurately controlling the air-fuel ratio. Common examples include coolant temperature sensor, oxygen sensor, and throttle position sensor malfunctions. The coolant temperature sensor is typically installed on the engine block or cylinder head water jacket, directly contacting the antifreeze to measure temperature and provide relevant reference data to the ECU.
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