What Causes the Engine Tachometer Needle to Shake at the 0 Position?

1 Answers
Liam
07/29/25 11:47pm
Small car engine tachometer needle shaking at the 0 position can be caused by the following reasons: Oil residue and carbon buildup in the throttle body, dirty intake manifold: A clogged intake manifold can lead to idle fluctuations, while carbon deposits or oil in the throttle body are the most common causes of unstable idle. Carbon buildup in the throttle body affects its opening degree and air intake volume, causing the engine speed to fluctuate erratically after a cold start, accompanied by strong vibrations. Weak spark from spark plugs: Faulty spark plugs can cause "misfire" symptoms in the car, but minor issues with individual spark plugs may result in unstable idle conditions.
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