Mechanics

A RATTLING SOUND

1999 Mercury Marquis • V8 2WD Automatic • 175,000 miles

When I press on the gas pedal to move forward either after being at complete stop or when I press the gas petal when I am going 50mpg I hear a rattling sound. What could that be?
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Mo414
August 13, 2011.



You know we can't hear it over a computer. There could be something loose in the exhaust system, from a rusted clamp to a broken substrate in the catalytic converter. A heat shield could be loose. Anti-sway bar links often rattle too. If you can't make the noise occur standing still, you'll need to have a mechanic put it on a hoist and search with a helper running the engine.

There is a tool called the "Chassis Ear" that can be useful too if you can find one. It consists of six microphones, a switch box, and headphones. You place the microphones on suspect parts, then listen while driving and switching between them. Be aware that many mechanics have never heard of this tool. You might find it at an auto parts store that borrows or rents tools.

Caradiodoc
Aug 14, 2011.
Here we go again. If I knew where this jacka! Was, I'd visit him with a baseball bat. He has no clue how to reach his target audience.

Caradiodoc
Aug 14, 2011.