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Registered
Join Date: Dec 2001
Location: Dayton, OH
Posts: 342
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sounds like pebbles in muffler
My car is making terrible sounds like there are pebbles in my muffler....
Advise please... Scared that there is motor damage... If I turn in tight circles it stops, then when I go straight again it starts, when I turn the motor off they continue to bounce around for a few seconds then stop. |
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11-03-2008, 09:09 AM
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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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Muffler or cat? If cat, the honeycomb inside may have failed. Muffler, don't know.
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Hugh |
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11-03-2008, 09:11 AM
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Join Date: Dec 2001
Location: Dayton, OH
Posts: 342
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no cat, 1986 3.2 motronic motor, headers, sport muffler....
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11-03-2008, 09:18 AM
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Join Date: Dec 2003
Location: MS.
Posts: 2,322
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Maybe some baffles have come loose inside the muffler??
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84' Steelslantnose Cab. 1953 Dodge B-4-B-108" 90,127 miles 1953 Dodge B-4-C-116" 58,146 miles 1954 Dodge C-1-B8-108" 241V8 POLY 1973 Roadrunner 440-SIX-PACK* 1986 F-250 Super Cab-460 V8 tow Newest additions- Matching numbers 1973 340 Road Runner!! 1948 Dodge B-1-F-152" 1-1/2 ton Dump body, 39,690 miles others... |
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11-03-2008, 09:24 AM
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Join Date: Nov 2008
Posts: 12
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Maybe a bolt has sheared off?
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11-03-2008, 10:05 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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kids putting rocks in the exhaust?
A friends kid put sand in his race car, he was filling it up like dad did.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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11-03-2008, 10:31 AM
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Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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Quote:
If the motor is stopped and no exhaust is being forced through, then it may not be loose objects flying around in the exhaust stream. Possibly broken bits of baffel (or a whole baffel itself) that has dislodged and rattles through vibration and heat expansion. Turning may cause the baffel to wedge itself and stablize for a while. With the motor off, cooling of different metal pieces may cause the sound. It you're sure it's from the muffler, then motor damage risk is small--unless a blockage occurs. Best to get it looked at.
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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11-03-2008, 10:58 AM
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Check out this thread: Loud Exhaust but only when Hot after highway run – Has me Baffled
I had a similar problem but it was worse when hot. Is the sound there all the time or is it related to how hot? I have not driven mine a lot since I tightened the air injection plugs and am thinking about replacing the muffler. The other thing it to do a good visual inspection of all the pipes. Can you record the sound and attach it?
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Keitho64 05 GTO 00 911 C2 64 Corvair Chicago Burbs; the Anti-Dragon... 11 turns in 318 miles |
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11-03-2008, 01:11 PM
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N-Gruppe doesn't exist
Join Date: Jun 2005
Location: *%@#ing GPS, where am I? Oh wait I see the Space Needle.
Posts: 4,394
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you can always pull the muffler off and shake it, and if it rattles i bet the baffle is toast.
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Ted '70 911T 3.0L "SKIPPY" R-Gruppe #477 '73 914 2.0L SOLD bye bye "lil SMOKEY"  "Silence is Golden, but duct tape is SILVER.” other flat fours:'77 VWBus 2.0L & 2002 ImprezaTS 2.5L |
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11-03-2008, 03:10 PM
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Registered
Join Date: Dec 2001
Location: Dayton, OH
Posts: 342
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resolved.
pulled muffler, got nuts and bolts out... darn vandals... |
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11-03-2008, 05:54 PM
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Rocks in your muffler.
My 85 911 coupe had a similar sound. Though I'd describe mine as ball bearing bouncing in a coffee can.
The baffles were shot inside the muffler. I just replaced it myself. it only took 15 minutes. 
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11-08-2008, 04:08 PM
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RETIRED
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Pull the muff...toss on a replacement, drive like ya stole it, have a beer, talk amonst yerselves....do it agin untill it stops.....report back.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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11-08-2008, 04:13 PM
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1969 Porsche 911T
2000 Porsche 911 C2
Da cab
