Crackling Noise under Car?

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R129 W163
B Class
Posts: 15
Joined: Thu 02 Feb, 2012 7:22 pm
Model you own: R129

Crackling Noise under Car?

Post by R129 W163 » Fri 17 May, 2013 4:50 pm

Q ?? for SL Gurus ( SL 280 1997' R129, Eng 104.)
Engine Cold no noise under Car in P or D selected,
Engine Hot crackling noise under Car in D but not in P selected,
Car runs A1, no oil leaks anywhere ,40k on Speedo,
New Trans. oil fully syns,replaced,fresh Eng. Oil syns.& filter,
becoming new problem in future ??
Any info be GREAT on this case! :dontknow:
Cheers Wally S A Mercedes Benz Club Member
:sunny:

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AMG
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Re: Crackling Noise under Car?

Post by AMG » Fri 17 May, 2013 4:58 pm

check your catalytic converter. the core might have started to disintegrate. when the ceramic goes, or the heat shield breaks away from the converter, it creates an intermittent rattling noise at lower rpm such as idling at lights. shift to N or P and problem disappears (higher rpm)

it's worth getting underneath to check all the heat shields and the cat.
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Classic 4sp auto Ardennes Green "Oswald"
2012 E63 AMG Speedshift MCT Diamantweiß "Klaus"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"

R129 W163
B Class
Posts: 15
Joined: Thu 02 Feb, 2012 7:22 pm
Model you own: R129

Re: Crackling Noise under Car?

Post by R129 W163 » Sat 18 May, 2013 5:46 pm

Hi Joe B,
Thanks a LOT for your INFO , I shall check it out & it sounds like that EXh , System !
GREAT !!
Keep on Benzing Wally SA :sunny:

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