Question about 2004 Lexus RX 330

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When accelerating the vehicle is louder than norrmal. Could it be intake ot exhaust mainfold problems. Under normal conditions it runs great. Under a load somewhat noisy. Lexus finds nothing wrong?

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  • jbschrager Jul 31, 2010

    The vehicle was rear ended at a 5 MPH on the muffler. They only thing changed was stainless tail pipe cover. Two visits to Lexus and one to a muffler specialist. They only changes some yoke rings. Still louder than ever.

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This may just be from a muffler starting to fail internally. However a broken exhaust gas recirculation tube is likely to blame for this. This tube will run from the catalytic converter to the engine smog pump or recirculation pump. If this tube has a hole or is broken you may only notice this noise when the EGR valve is open or the Emissions control pump is on.

Posted on Jul 30, 2010

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  • Dorrian Wilkins
    Dorrian Wilkins Jul 31, 2010

    I would suggest taking it back to the muffler shop. Have them place it on the rack and thoroughly inspect the exhaust and emissions system.
    I think you will find that you have a exhaust leak in the EGR tube or you might even have a exhaust gasket ( donut gasket) near the manifold. The Exhaust shop has the ability pressurize the system and find the leak if you have one.
    The only other possible problem could be a Exhaust manifold gasket which too can be check at your muffler shop.


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