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Auto>General Auto

Why tachometer needle jumps up and down?

Updated: 4/28/2022

Wiki User

∙ 11y ago

Best Answer

A cars tach jumps and runs with engine rpm.Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing.If it jumps with no engine speed or sound change it means your alternator is going bad.

Wiki User

∙ 11y ago

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