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Ticking sound

  

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Hi, I have a Mercury Grand Marquis 2011.  With 160k miles. I hear a ticking sound that comes from the engine every few minutes especially when the car is cold. It’s a tick every couple of minutes. The sound comes also when I turn off the car, I tried to determine the source and couldn’t, but it’s around the fuel injectors on the passenger’s side. 


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Your hydraulic lifters may be starting to go out, or a fuel injector may be starting to tick. You can confirm this by listening with a mechanic's stethoscope. 


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