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knocking

  1. Loud knock from engine when shifting.

    smart Operation and Maintenance
    I have had my Smart for 3 years and have done the regular oil changes and maintenance every 7k except the last time which was 10k. After the last one my car started knocking loud when it hits higher RPMs. In fact sometimes (in automatic) it won't shift on it's own unless I let off the gas. It...
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