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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Burnt valve

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Old Dec 14, 2007 | 08:58 AM
  #1  
mrstang01's Avatar
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From: Central KY
Burnt valve

Can anyone give me an explanation for what it means when someone says an engine has a burnt valve?

Also, what are the symptoms?

Thanks,

Michael
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Old Dec 14, 2007 | 09:13 AM
  #2  
1989toy4wd's Avatar
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From: Beaumont, Tx
basically its when part of the valve got so hot that it broke off, symptoms would include rough running, missing, High HCs comming from the exhaust, back firing, ETC
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Old Dec 14, 2007 | 10:16 AM
  #3  
rdharper's Avatar
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From: Morgan Hill, Ca
Originally Posted by mrstang01
Can anyone give me an explanation for what it means when someone says an engine has a burnt valve?

Also, what are the symptoms?

Thanks,

Michael
A burnt valve means enough material on the valve has been destroyed to affect compression.

This would be around the edges where the valve is thinnest.
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Old Dec 14, 2007 | 12:26 PM
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surf4runner's Avatar
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From: so.cal
also they will split/crack around the sealing edges

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