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Q:

vibration, engine noise on 1999 Lexus SC400

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Two problems: 1)Noticable vibration at 2000 rpm in Park. Noise heard about 65-70 mph like a harmonic sound (clothes washer sound). Tires have been replaced. 90K service performed in November including all belts, timing belt.
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Possible Exhaust loose or exhaust manifold. good luck
Thanks for the quick reply. I will certainly follow through with this. I will let you know what I found out.