Question about 2002 Lexus RX 300

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There is a rattling noise that is getting louder coming from the motor area of the car at lower speeds what could it be?

It was soft at first but got louder. Our local mechanic replaced a piece of the exhaust system and it seemed to get less noticeable but now it is getting louder again. It's like a piece of metal is loose or something. Any clues?

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IF this is occurring on light acceleration or when the motor is under load then it may be detonation in the combustion chambers . IT is from air/fuel ratio incorrect and ignition timing incorrect. Run the fault codes to check for codes associated with the air flow and the exhaust as the ECM is having difficulty adjusting the settings for the engine.

Posted on Mar 23, 2014

  • 2 more comments 
  • Christine Grady
    Christine Grady Mar 23, 2014

    I never hear it over 35mph or on idle

  • Bill Boyd Mar 23, 2014

    you will not hear at idle as there is insufficient compression pressure generated for the spontaneous combustion to occur and over 3.5mph the noise is lost in other engine and wind noise However it it is detonation as I suspect then it will be still happeneing

  • Christine Grady
    Christine Grady Mar 23, 2014

    Sounds good I'll let you know how it turns out

  • Bill Boyd Mar 23, 2014

    run the fault codes as it may point you in the right direction.

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