can break a valve and drill the engine cylinder 2JZ GE being in power without accelerating in park?

2001 LEXUS IS 300
76,000 MILES
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ALBERTO GOMEZ GARCIA DE LEON
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my car had a fault in the coils and the mechanic told me that at the end of change that when doing the tests having the engine running without speeding it broke a valve and the cylinder is drilled.
why did this happen?

Thanks for your attentions.
Feb 11, 2012 at 9:33 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
sometimes stuff happens and does this. it may have had a piece come out while doing testing.
Feb 11, 2012 at 9:36 PM
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