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Mercury Mariner engine roar

  

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I have a 2010 Mercury Mariner with the 2.5 ltr 4 cylinder. It has 158000 miles.  For months the engine has growled/roared when first under load, such as backing out of my driveway or when first put in drive.  It is worse in hot weather.  A mechanic said the motor mounts were fine.  Power output is fine otherwise.  Everything is original except the brakes and tires.  It does not burn oil and I have been very careful to do all scheduled maintenance. 

I would appreciate any suggestions.


2 Answers
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is it an automatic? How's the fluid?


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Check the color of transmission fluid.


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