Loud (could-be) valve closing sound after .5sec engine is switched off

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swansonsz

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Jun 4, 2012
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Upon reaching home, after half a second the engine is switched off, there is a loud sound of some sort of valve (or so i think?) closing coming from the center of engine. Never noticed this before. Could be a some side effect of the a/c servicing? Just had the service done at Naidu's. Has anybody experienced this before?
 
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