Spark Plugs Are Light Grey/whits And Their Is Oil On The Threads - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-26-2004, 02:05 AM
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Spark Plugs Are Light Grey/whits And Their Is Oil On The Threads

I bought my friends rebuilt motor from him.....Its a pontiac 400. He said the motor runs rich.........Well when I took his plugs out I would have to agree......The motor sat for 2 years after a rebuild....I put the motor in and it runs really good.......Problem is when I pulled the plugs to read them I noticed they are light grey/white.....There is also oil on the threads......Is oil on the threads normal??? And grey/white sounds lean.............I really dont know where to start ......any good suggestions would be appreciated......thanks
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Old 05-26-2004, 12:25 PM
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Sounds like the plugs may be okay, but the oil on the threads may mean something more. Pull the plugs and clean them. (threads too) Re-install them and get a fresh reading after about a week of driving. If you don't have valve cover leaks, and yet you till have oil on the plug threads then there might be an issue of leakdown through the guides, or blow by through the rings. Theses problems will usually change the plus color, but check the exhaust for blue smoke on acceleration or startup. Startup smoke usually means guides, and acceleration smoke usually means rings.

There's a link to a plug reading page, hope this helps.

http://www.spark-plugs.co.uk/pages/t.../diagnosis.htm
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