Why does the Nissan Teana have unstable idle speed when cold?

1 Answers
DeGabriela
07/30/25 4:55am
Reasons for unstable idle speed of Nissan Teana when cold: dirty throttle, slight lateral tilting of engine transmission, and ignition system failure. The following details the reasons: Dirty throttle: In cold conditions, carbon deposits will absorb part of the fuel, and if the fuel does not completely enter the cylinder for combustion, symptoms such as unstable idle speed and difficulty in starting will occur. Slight lateral tilting of engine transmission: Because there is a certain angle between the axial direction of the half shaft and the axial direction of the inner ball cage, the force point continuously changes back and forth along the axial direction during the rotation of the ball cage, causing vibration. Ignition system failure: For ignition system failure, it is necessary to check the spark plugs, cylinder wires, and ignition coils. Usually, leakage of cylinder wires or carbon deposits on spark plugs will cause vibration.
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