Question about 2007 Toyota Yaris

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My Toyota Vitz has a problem of engine knocking even when the engine is cold. the knocking reduces if i press hard on the gas, other wise it knocks while shifting and initial pick up as well.

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  • Toyota Master
  • 6,826 Answers

Knocking can be caused by a bad bearing somewhere in the engine. When the engine is accelerated it might go away due to higher oil pressure.

When did you have the oil changed and how many miles does it have?

Is the knocking rapid (5 or 6 times a second) or periodic (1 or 2 times a second)?

Some knocking is due to low octane gasoline if you experience it at highway speed.

Good luck on solving this knocking problem.

Posted on Oct 07, 2010

  • musti_4ever Oct 07, 2010

    The last oil change was 3000 Km back just 2 months ago.
    The knocking is rapid and it is there at high way speed as well, especially when the automatic gear shifts and my foot is light on the gas. i have tried using high octane gasoline but it make not a big difference.
    tell me would changing the spark plugs help???? the total mileage on the car is 50,000 Km

  • Duane Wong
    Duane Wong Oct 07, 2010

    I sort of doubt that spark plugs alone would solve the problem (assuming they're within specifications as far as gap).

    I might try some anti knock cylinder clean out solution available at your local auto parts store.

    Sometimes, carbon will build up in the cylinder creating hot spots that pre-detonate the gasoline or fuel causing the knocking situation.

    I looked up your vehicle in my online resource but didn't find it specifically, to determine if there is a 'knock' sensor that may not be functioning correctly.

    Cars that have knock sensors will advance the timing by up to 15 deg. or so via the computer to reduce predetonation knocking.

    I wish you luck on reducing knocking in your engine.

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