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Like mentioned above it might just be from the heat shield since after driving for some time the engine and surrounding parts get hot enough that once shut off, it goes through some massive drop in temperature and through that you get the pinging sound. Usually that sound decreases with the cooler the engine and surrounding parts get.
 

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Discussion Starter · #4 ·
I took it too dealership. They say the purge valve. It was it sounds like which has to do with fuel. I haven't heard the noise again. I'll try again when I put new fuel. Which will be in two to three weeks. Fuel saver the ia is. Thanks.
 
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