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Old 06-27-2007, 09:28 PM
Registered User
Join Date: Jun 2007
Posts: 1
87 300TD engine rattles at low rpm

The car seems to run fine, but driving at low rpm seems to cause an irregular rattling noise from the engine. Any ideas?

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Old 06-27-2007, 09:58 PM
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Welcome to the forum.

The problem with noises is that they are very difficult to diagnose from simple words on the internet.

If you can post a sound clip from the engine, it would provide much greater insight as to the problem.
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Old 06-28-2007, 06:37 AM
muleears's Avatar
Old MB Driver
Join Date: May 2006
Location: Windsor, VA
Posts: 1,435
Mine used to rattle at idle and slightly above. In my case it was the belt tensioner shock and spring. Might be worth a look.

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Old 06-28-2007, 08:00 PM
deanot442's Avatar
Diesel Dean
Join Date: Feb 2004
Location: Canterbury CT
Posts: 204
Brian makes a good point. too many things can rattle under the hood of one of these old cars, but i also agree with cal that a good place to look is the tensioner "shock" or dampner.
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Old 06-28-2007, 08:15 PM
Posts: n/a
Yup, we're just guessing based on very little info, but I would also make sure it's not coming from the vacuum pump.
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Old 06-28-2007, 09:37 PM
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Join Date: Mar 2007
Location: miami
Posts: 136
my 300sd 83 makes far more racket at idle then being driven
loose aircleaner is also a common fault

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