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2006 Avalon flapping engine sound. Timing belt?

2006 Avalon at slow constant speeds I hear what sounds like a flapping sound from the engine. Could this be a bad timing belt?

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  • Anonymous Mar 16, 2014

    I have a 2006 Toyota Avalon I hear the tappets, recently. Does this affect the gas usage?

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It sounds more like a loose engine or sump cover which some cars have tokeep dirt off various parts. sometime they come loose thru missing screws and the wind catches them as u go and makes them flap about, but as u go fast the wind force pins them back so they dont flap

Posted on Aug 09, 2009

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What are the symptoms of a broken time chain on a 2006 4 cylinder Toyota tacoma


Strange things happen when a timing chain breaks. This chain drives the camshaft at exactly half the speed of the crankshaft. If the chain breaks it could jam the crankshaft so that the engine can't turn, even by hand. If the engine does turn and the chain is broken, you will hear an uneven cranking sound coming from the engine.
What usually happens is that one or two cylinders end up with all valves closed, and this causes a high compression as the engine is turned by the starter. The valves on the other cylinders remain open all the time and there will be no compression on these., so the engine sounds as if it is turning fast, then slow in very quick succession.
It often happens that, because the timing is out for the short while that the engine turns without the timing chain, the valve timing is out by so much that the pistons strike the valves and bend them, so that there is no compression whatsoever, and when you crank the engine with the starter, the engine just spins freely. In any case, whatever the symptoms, the engine will not start!

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