oil in the spark plug holes - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 03-11-2010, 05:10 PM
dozz dozz is offline
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2003 Chevy TrailBlazer LT
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oil in the spark plug holes

i replace the spark plugs on my 03 trailblazer 6cyl the other day and 4 of the six had some oil on the outside part of the spark plug - seemed to be pooled in the hole around the spark plug. does this mean i need a new valve cover gasket? if so, the chilton book says i have to remove the a/c line that crosses the front of the motor - any way to change the gasket without having to tear into the a/c system?
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  #2  
Old 03-15-2010, 06:44 PM
JonF JonF is offline
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Without looking at mine again I don't know how a leaky valve cover gasket would put oil on your spark plug. A V-8 yes but a inline 6 any gaskets would be below the plug. I would check all hoses. If you can not find anything clean it real good and drive it for a day and see what you find. It may have been just a fluke.
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Old 03-15-2010, 11:46 PM
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Quote:
Originally Posted by JonF View Post
Without looking at mine again I don't know how a leaky valve cover gasket would put oil on your spark plug. A V-8 yes but a inline 6 any gaskets would be below the plug. I would check all hoses. If you can not find anything clean it real good and drive it for a day and see what you find. It may have been just a fluke.
A worn valve cover gasket can cause oil to leak into the wholes on these engines. It's a very little amount though, not anything like hondas or mitsu's.

Not sure about the a/c system question though.. sorry
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Old 03-16-2010, 12:02 AM
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jacob789456 jacob789456 is offline
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how many miles? 130k here and not a drop on the plugs at 128k (these were the OEM's).
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Old 03-16-2010, 12:55 AM
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Blazernut Blazernut is offline
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The oil is redundant in small amounts in the spark plug wells. It is a seepage problem and is not a pressure driven leak so it should not get any worse. I would not change anything unless I had oil spreading across the motor or pavement.
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Old 03-16-2010, 10:02 AM
JonF JonF is offline
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I forgot that the sparkplug sits in a hold below or at the level of the valve cover gasket.
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Old 03-16-2010, 10:52 AM
The Guru The Guru is offline
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Not only does the ac line have to be removed, the intake manifold has to be removed also.
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Old 03-20-2010, 06:04 PM
dozz dozz is offline
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Thank you all for the feedback. I have not noticed any oil drips on the ground or any appreciable oil consumption so I guess I will leave it alone for now. I certainly do not want to open the a/c system for something so minor.
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Old 06-04-2010, 07:24 PM
jac113 jac113 is offline
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I actually started a new thread today for having oil on my plugs. It turns out that there was excessive oil seaping into the intake ports somehow. Either pvc system or bad oil ring on piston. The valve cover gasket has been changes so hopefully that solved the problem. I was losing about a quart every 1,000 miles or so
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