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07-31-2014, 10:02 PM
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#1 |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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454 Burnt Valve, REALLY?
What does a burnt valve sound like or does it make any sound at all? I think it was my crazy grandfather who taught me to put a piece of paper up to the tail pipe while running and if it tried to suck the paper in every once in a while then I had a burnt valve? How true is this? The reason I ask is my crazy grandfather is from NE Oklahoma and is known to hit the "moonshine" from time to time!
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07-31-2014, 10:21 PM
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#2 |
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Registered User
Join Date: Jan 2010
Location: northern arizona
Posts: 259
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Re: 454 Burnt Valve, REALLY?
Put a vacuum gauge to direct manifold vacuum.
It'll show a burnt valve among other problems. Go to this site and scroll down for what the readings mean. http://www.secondchancegarage.com/public/186.cfm I would say the info source is more trustworthy than somebody who hits the "shine".
__________________
"Off the grid and on the seven day weekend plan" "One person cannot know everything, but between all of us, there isn't much we don't know." |
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08-01-2014, 07:29 AM
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#3 |
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Registered User
Join Date: Mar 2012
Location: Woodbury, Ct.
Posts: 1,692
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Re: 454 Burnt Valve, REALLY?
My 6.0 had a loud tick coming from the exhaust with one burnt valve.
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08-01-2014, 08:44 AM
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#4 |
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Registered User
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
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Re: 454 Burnt Valve, REALLY?
Mine had some smoke out that side of the exhaust and also had the ticking sound.
__________________
2017 Silverado LTZ 6.2 1984 Scottsdale K10 - 468 700r 4x4 lwb 1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb 1968 GMC 20 305 V6 good ole wood hauler.  Good Fences make good neighbors |
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08-01-2014, 08:58 AM
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#5 |
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Registered User
Join Date: Jul 2012
Location: Des Moines IA
Posts: 1,250
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Re: 454 Burnt Valve, REALLY?
Small tick that sounds like an exhaust leak. Not likely unless you're running boost or N2O, but could happen NA in rarer cases.
__________________
- 1981 Sierra 454, NV4500 swap - 2006 Z06, 25k miles - 1973 Nova - Project CarNova Virus on Youtube |
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08-01-2014, 10:14 AM
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#6 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: 454 Burnt Valve, REALLY?
Quote:
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08-01-2014, 01:03 PM
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#7 |
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Registered User
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: 454 Burnt Valve, REALLY?
1. determine if the engine HAS a miss fire.
2. the dollar bill trick only works if its an exhaust valve. 3. vacuum gauge is still one of the easiest low buck diagnostic tools. if the needle is oscillating rapidly , something is wrong. 4. if all else fails a "leak Down" tester is your most reliable option. give a percentage of leakage per cylinder, then compare it to all others. Is this why you had a "Camshaft Replacement" related thread earlier? Desert |
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08-02-2014, 08:49 AM
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#8 | |
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Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: 454 Burnt Valve, REALLY?
Quote:
Also maybe why there is a bizzare plug color thread? |
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08-02-2014, 10:34 AM
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#9 | |
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Registered User
Join Date: Oct 2011
Location: phoenix, az
Posts: 508
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Re: 454 Burnt Valve, REALLY?
Quote:
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08-02-2014, 11:26 AM
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#10 |
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Registered User
Join Date: Dec 2013
Location: Columbus, Oh
Posts: 367
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Re: 454 Burnt Valve, REALLY?
Pull the plugs and take a compression test. That or a leak down test are the only way to know for sure with out taking the engine apart.
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