Question about 1990 Toyota Camry

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My 1990 camry has oil in the spark plug tubes. Everything seems sealed. Got any ideas? Your help would be greatly appreciated.

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If my memory serves me right, your plugs go down through the valve cover. There is a gasket around the spark plug holes that needs to be replaced.That is where your oil is coming from. Replace the outer gasket around the edge of the cover while you are at it. Hope this helps.

Posted on May 08, 2010

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Read above, a valve cover gasket kit is cheap and takes minimal skills and tools. Just make sure you keep it very clean when you put it together.

Posted on Aug 18, 2012


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Either worn valve guides, valve guide oil seals on that particular cylinder, or worn piston rings. You need to perform a compression test to find out which one of these it is.

Compression check each cylinder with all plugs removed. Take notes on which cylinder has the weakest compression.

If no compression difference and if all operating within range, then change the valve guide oil seals on problematic cylinder.

If the cylinder shows a significant drop in compression, then drop no more than five or six drops of oil down the plug hole of the problematic cylinder, and perform the compression test again. The oil will temporarily seal any worn piston rings, so the pressure should rise when retesting if the rings are worn. If the pressure remains low, then your valves are not sealing properly and require attention.

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