1999 Lexus ES 300 Rattle on Acceleration

1999 LEXUS ES 300
131,000 MILES • 6 CYL • FWD • AUTOMATIC
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ELECTION82
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My 99 Lexus is always well taken care of and oil changed every 3000 miles. Recently, the engine has started to make a tiny rattling sound. This sound only grows as the car is driven more during the day. At the start of the day, the car is fine and never makes the noise, but the more miles the car packs on during the day the louder it becomes and only when accelerating. I've taken it to the shop but they cannot reproduce the noise and they say everything looks fine. What could it be?
Nov 2, 2008 at 1:13 PM
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RASMATAZ
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This noise-is it coming from the lower or upper part of the engine-does it sounds like ticking/tapping/thudding/thumping ?-could be pinging/detonating due to excessive advance ignition timing or engine overheating
Nov 2, 2008 at 3:36 PM