Question about 1999 Mercury Mountaineer

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Have a 1999 mountaineer when its idling it make a rattling noise

The truck runs and drive good it just make a rattling noise change pully

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If in fact it is a timing chain rattle make sure that you have the correct oil level and oil viscosity. The hydrolic tensioners depend on that for proper tension. Other things that may cause a rattle would be the catalytic converter and broken exhaust hangers or exhaust pipes.

Posted on Apr 01, 2014

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Could be worn out timing chain guides

Listen with a stethoscope to the front motor cover

Posted on Apr 01, 2014

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1 Answer

Rattling noise when idling


Under the car like the exhaust? Catalytic converters do that inside their metal shell or housing. Beat on it with your fist when it is cold to hear it. (Not running).

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Check all of your belts and pullies. Sometimes it helps to remove the belts and turn the pullies by hand. Also run the engine without the belts for a few seconds. If the noise is still there, then it is most likely timing components rattling.

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Hi,you should change cambelt pully(there is a bearing inside pully before it worn out completely,it will cause high friction and heat to burn out your bell and rattling noise).buy cambelt pully from the dealer then take it to the garage ask them to put it in for you (labor about 30.00 dollars)...the rest is ok to wait until 150.000 miles.
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The best way to find the noise is to remove the belt
and check each pully by hand. If a pully locks up it
will make more of a screeching sound. A rattle sound makes me think your idler pully is loose.
Hope this helps. Good luck.

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You could have a worn serpentine belt, and or bad idler pully bearing or a bad serpentine belt tensioner. With that anount of miles and years in the truck, it wouldn't hurt to change all. A good thing to check if it is the belt is to spray some water on the belt while the engine is running. If the noise goes away then it's your belt and while the belt is off, it's a good time to check the pully bearings.
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