Question about 2004 Lexus ES 330

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Accelerate and noise on driver side sounds like flapping wooshing underneath car

Sound underneath car on driver side when accelerate up to 30 to 40mph

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Most all cars nowadays have several plastic water shields fastened under the front of the car.
I believe one or two of those black plastic shields is rubbing one of your tires, or a pulley or some other moving part.
Someone is needing to crawl completely under the car to find this out. Those shields are important, but if one or two is damaged,
removing them should not hurt anything.

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

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If it's only happening when it's cold out, I'd probably not worry about it too much, unless it becomes a constant issue, even when warmer out. One of the drawbacks of this problem means that in order to get the same stopping power you used to have, you may have to exhibit more force on the brake pedal than when it's not leaking.

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You have 2 cats B1 & B2 and it sounds as if the right side (B1) is clogged. If that's the case you will need to replace it with a new one from your Nissan Dealer. While your in there you should check the condition of that right exhaust manifold as they are known to crack and if so replace it while your replacing the cat. Hope this helps.

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