Question about 2002 Lexus RX 300

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Rattling noise when accelerating

At first was barely noticeable but getting louder now

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With the Engine cool, locate the catalytic converters, one on the front of the engine and one on the back, start the engine and listen for exhaust, if you can hear the exhaust place your hand near the converter shield ends and see if you feel air movement, the catalytic converter may have a circumferential crack and has broken open. Replace the converter.

Posted on Sep 17, 2014

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

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

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