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

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Torgy, 2.3L 4 Cylinder Turbo, Whitehall, MT, August 09, 2012, 13:19
 Rookie

I pulled the head and there is a hole burned through the top edge of the piston.

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  • Answer #1

    Greg's Orange Auto (8356 Answers) , Orange, CA - (714) 361-9355
    globalhelper August 09, 2012, 13:58
     Master

    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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