Rattle Coming From Under the Car - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 05-04-2011, 02:53 PM Thread Starter
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Vehicle: 1991 190E 2.3
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Rattle Coming From Under the Car

I have a 1991 Mercedes 190e 2.3, and have noticed a rattle lately. It sounds like its coming from underneath the car and on the passenger side. It only happens when I'm accelerating. I can hear it when my windows are down and I'm driving next to a wall or car, somewhere where the sound can bounce off. Any ideas of what it might be? I'm thinking it could be something with the exhaust system, but thats just a guess.
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post #2 of 10 (permalink) Old 05-04-2011, 03:03 PM
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It's most likely your shifter bushings.

Do you have an automatic or a manual?



1979 Pontiac Firebird 5.7- 86,142 miles
1981 Chevrolet Corvette 5.7
1984 Mercedes 190D 2.2 Auto - 140,628 miles
1987 Chevrolet Sprint 1.0 - 139,000 miles
1989 Oldsmobile Cutlass Calais S - 123,000 miles
1989 Chrysler New Yorker - 95,000 miles
1991 Dodge Stealth R/T - 101,000 miles
1999 Dodge Durango - 178,000 miles
2003 Dodge Dakota - 203,000 miles
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post #3 of 10 (permalink) Old 05-04-2011, 03:13 PM
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I think it's his cat converter.
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post #4 of 10 (permalink) Old 05-04-2011, 04:27 PM Thread Starter
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i have an automatic
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post #5 of 10 (permalink) Old 05-04-2011, 06:28 PM
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i have the same thing.....last time i was under there i noticed the heat shield of the cat or something on the exhaust was loose.....i'm going to weld that up next time i'm under there......hope that stops it.
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post #6 of 10 (permalink) Old 05-05-2011, 04:27 AM
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This is just a guess without seeing the car.

Check to see if you have that creamy froth in your coolant tank. If you do, then it is likely you have a leaky head gasket. It may be coolant seeping into the exhaust stream that burned out the catalytic honeycomb inside your catalytic converter. A new exhaust system from the dealer is $2,500.

The honeycomb shrivels up into a ball and rattles around inside the steel casing. When you go in reverse, the car whistles.

However, do not replace the exhaust system until you perform a head gasket replacement and a machining of the head ($2,000). You'll destroy the new catalytic converter.

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post #7 of 10 (permalink) Old 05-05-2011, 06:07 AM
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^ rofl, way to give the poor guy a heart attack.

It's something much simpler, probably a heat shield. They're notorious for corroding away from their flimsy weld points and making all kinds of noise.

Have someone small, preferably a kid if you have any, hang onto the undercarriage of your car while you drive down the road and have him or her locate the exact part that's making the noise.


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- 2002 GMC Sierra Denali Quadrasteer -
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post #8 of 10 (permalink) Old 05-05-2011, 12:15 PM
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Mine was doing the same thing for awhile, rattle when I would accelerate. Ended up jsut needing shifter bushings. Check the condition of yours and report back.



1979 Pontiac Firebird 5.7- 86,142 miles
1981 Chevrolet Corvette 5.7
1984 Mercedes 190D 2.2 Auto - 140,628 miles
1987 Chevrolet Sprint 1.0 - 139,000 miles
1989 Oldsmobile Cutlass Calais S - 123,000 miles
1989 Chrysler New Yorker - 95,000 miles
1991 Dodge Stealth R/T - 101,000 miles
1999 Dodge Durango - 178,000 miles
2003 Dodge Dakota - 203,000 miles
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post #9 of 10 (permalink) Old 05-05-2011, 12:23 PM
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Quote:
Originally Posted by ax456 View Post
i have the same thing.....last time i was under there i noticed the heat shield of the cat or something on the exhaust was loose.....i'm going to weld that up next time i'm under there......hope that stops it.
Same here....I just looked under there last week and there is a heat shield on the exhaust that is loose.

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post #10 of 10 (permalink) Old 05-05-2011, 04:16 PM Thread Starter
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turns out it was the heat shields. i just crimped it to the exhaust as best i could to keep it from rattling. the shifter bushings were fine. glad it wasnt what lomtevas thought. thanks for all the help guys
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