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Sound like Carbon Build-up to you?

posted by TONY H on Wed Jul 1 06:59 CST 2009
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last visit: Fri Oct 17 16:39 CST 2014

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Not just Volvo. Has anyone experienced carbon buildup on any car that made the car sound like it has a Rod knock?
Does anyone think that Carbon breaking loose off a Piston can cause a Valve to bend?
My daughters Blazer (4.3 V6) went from running beautifully to this harsh Knock in a blink of an eye. At that time it runs very rough like it's down a cylinder. But then noise goes away, Roughness disappears and all is good. I have let it idle for an hour that way and out of nowhere the hard knock comes back. I will do a compression check but the symtoms have me Buffaloed.
Seems like a stuck Valve or lifter but the Knock really sounds like Lower End... but then all goes away except for a new slight tap sound (hence my bent valve question). Then the hard knock comes back at anytime. The Blazer Websites are useless.. No 'real' engine knowledge on those sites.

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'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm

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Sound like Carbon Build-up to you?
posted by TONY H subscriber on Wed Jul 1 06:59 CST 2009 >

Sound like Carbon Build-up to you?
posted by will rehsper subscriber on Wed Jul 1 08:37 CST 2009 > V

Sound like Carbon Build-up to you?
posted by billy242 on Wed Jul 1 09:19 CST 2009 > V
- Sound like Carbon Build-up to you?
  posted by TONY H subscriber on Wed Jul 1 09:40 CST 2009 > V
  - Sound like Carbon Build-up to you?
    posted by billy242 on Wed Jul 1 12:21 CST 2009 > V
    - Sound like Carbon Build-up to you?
      posted by TONY H subscriber on Thu Jul 2 01:33 CST 2009 > V
      - Sound like Carbon Build-up to you?
        posted by sdewolfe subscriber on Thu Jul 2 10:17 CST 2009 > V
        
        Sound like Carbon Build-up to you?
        posted by TONY H subscriber on Fri Jul 3 03:18 CST 2009 > V

Sound like Carbon Build-up to you?
posted by walrus3 subscriber on Wed Jul 1 12:38 CST 2009 > V
- Sound like Carbon Build-up to you?
  posted by TONY H subscriber on Thu Jul 2 01:24 CST 2009 > V
  - Sound like Carbon Build-up to you?
    posted by walrus3 subscriber on Thu Jul 2 03:01 CST 2009 > V
    - Sound like Carbon Build-up to you?
      posted by TONY H subscriber on Thu Jul 2 03:23 CST 2009 > V

Sound like Carbon Build-up to you?
posted by mmal231294 on Thu Jul 2 03:55 CST 2009 > V
- Sound like Carbon Build-up to you?
  posted by TONY H subscriber on Thu Jul 2 04:17 CST 2009 > V

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Sound like Carbon Build-up to you?