1990 Mercedes Benz 300sd noise under my car

1990 MERCEDES BENZ 300SD
96,431 MILES • 6 CYL • 2WD • AUTOMATIC
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J P
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My car makes a loud rattling sound when I'm stopped with my foot on the brake and the tranny in D. it idles a lot lower the noise comes from under the middle of the car. If i shift in to neutral the noise stops. One of my friends said it might be the catalytic converter ?

My car is a Mercedes 300 ce
Feb 21, 2008 at 12:29 AM
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LALORENZO
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Hello JP,
It is very hard to assist you with a definitive answer. The noise your hearing could be almost anything. I think your friend meant the torque converter and not the catalytic converter. At any rate, you need to get dirty. Start by raising the idle. If the idle is too low, it causes increased vibration. Next, go under the car and start inspecting for anything obvious. Check your engine and tranny mounts. Also, shake your exhaust pipes they may be hitting something. I hope this helps....larry
Feb 21, 2008 at 1:08 AM