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Missing Heat Shield Causing Oil Fouling?

Old October 10th, 2012, 10:05 AM
  #1  
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Default Missing Heat Shield Causing Oil Fouling?

This is for a 1991 Chevy G10 Van with a 5.7L (350cu.in.) engine.

The engine has been missing at an idle. The warmer it gets the more it misses.

The number 1 and 3 spark plugs are oil fouled.

The spark plug heat shield for the number 1 and 3 plugs is missing. I bought this van 30,000 miles ago. I was told that this engine was new and only had 40,000 miles on it. The guy who sold me the van put the engine in himself.

The engine oil is clean.

I can't help thinking that the missing heat shields have something to do with the missing. Has anyone ever heard of a missing heat shield causing oil fouling and missing?
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Old October 10th, 2012, 3:45 PM
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Originally Posted by unckybob View Post
This is for a 1991 Chevy G10 Van with a 5.7L (350cu.in.) engine.

The engine has been missing at an idle. The warmer it gets the more it misses.

The number 1 and 3 spark plugs are oil fouled.

The spark plug heat shield for the number 1 and 3 plugs is missing. I bought this van 30,000 miles ago. I was told that this engine was new and only had 40,000 miles on it. The guy who sold me the van put the engine in himself.

The engine oil is clean.

I can't help thinking that the missing heat shields have something to do with the missing. Has anyone ever heard of a missing heat shield causing oil fouling and missing?
No. It is possible the valve seals are leaking. Oil is getting into the cylinder, and being burned
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Old October 10th, 2012, 3:55 PM
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It turns out that the number 1 and 3 spark plug cables were switched. I switched them back and I have noticeably more power. Later on down the road I will take a look at the plugs and see if they are still fouled.
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