Why does my new car make ticking noises when the engine is off?

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Old 14 Jun 2010, 01:06 pm   #1 (permalink)
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Default Why does my new car make ticking noises when the engine is off?

My car is 2008 Toyota matrix. I just bought it in April 2008. It is only 1000 miles right now. The ticking sound always comes out and stays for about 1 minute when I turn off the egine.
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Old 14 Jun 2010, 01:09 pm   #2 (permalink)
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good question, i had a chevy truck that went hmmmmmm when it was off, and if i didn't use it for days it still did it every so often. i always said it was possessed.
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Old 14 Jun 2010, 01:12 pm   #3 (permalink)
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That "ticking" noise is nothing to worry about, all it is is either the exhaust manifold or the catalytic converter cooling off. When metal heats up it expands, and the "ticking" is just it cooling off. Kind of like how ice cubes pop when you run water over them.
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Old 14 Jun 2010, 01:15 pm   #4 (permalink)
aj
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all cars do. some louder than others. Its just the warm engine cooling down.
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Old 14 Jun 2010, 01:18 pm   #5 (permalink)
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the reason is because oil in the engine gets hot after a while and that sound is the oil bubling in the engine. Just like when you fry something the oil in the pan starts to boil and make that poping sound.
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Old 14 Jun 2010, 01:22 pm   #6 (permalink)
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Normal operating temps for the cooling systems are between 195-205 degrees--the exhaust manifold and catalyst around 1000 degrees plus. When hot, the metals expand and when they cool they contract. The ticking is most likely the engine/exhaust or heat shields cooling down and contracting, causing the ticking noise that you mention. Its not as loud as the shrill scream you hear















when your arm or hand touches that hot manifold =( .
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Old 14 Jun 2010, 01:24 pm   #7 (permalink)
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It's okay ... your car is just cooling off.
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Old 14 Jun 2010, 01:27 pm   #8 (permalink)
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its probably your engine just cooling down
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Old 14 Jun 2010, 01:30 pm   #9 (permalink)
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Exhaust will tick or crack when cooling of
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Old 14 Jun 2010, 01:33 pm   #10 (permalink)
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that pretty normal... every car makes noise whn it cools off!!
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