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1990 Volvo 740 4 cyl. Hole burned through top of piston 4.
What is the cause?

(1990 Volvo 740)
in Whitehall, MT on August 09, 2012
I pulled the head and there is a hole burned through the top edge of the piston.
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Popular Answer
of Greg's Orange Auto on August 09, 2012
either something poked a hole or it ran so lean it burned a hole. lean could have been from a number of things
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