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1999 Buick Park Avenue Question: what would cause a dull boing noise after car engine is turned off.

 

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dodgeboy99, 3.8L V6, Thiensville, WI, March 29, 2013, 19:42
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occurs in 2 seconds intervals for about 5 minutes or so after the car has been driven maybe 20 minutes.So heat of the engine factors into this happening. shorter periods of driving does not cause the noise to occur. This happens after the car engine is turned off.

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  • Answer #1

    March 29, 2013, 23:12
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     Master

    your engine is decompressing(oil draining into pan). louder in some vehicles. rec. treatment with oil stabilizer on next oil change. this will recondition seals, and cylinders.

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    dodgeboy99, March 30, 2013, 05:36
     Rookie

    Thank you for your response will give your rec a try.

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  • Medium-star Best Answer
    March 30, 2013, 06:05
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     Master

    Most likely thermostat sticking then rapidly opening causing noise have cooling system checked!

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  • Answer #3

    March 30, 2013, 19:46
     Master

    Have you opened the hood and checked coolant level? BOTH when cold (before first start of the day , and after it's been warmed up as you describe? OOOOOOOOOOOOOOOORRRRRRRRRRRRRR.........another wild guess....but I think wetry is most likely correct.......is that the exhaust may be clogged and overheating and you may be hearing the metal 'pinging' as it cools down.

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