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Oil in the Manifold

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Does anyone have a clue what a puddle of oil would be doing in my intake manifold? Is it possible that the oil/air seperator could have caused this, it's never been changed in 160K miles of driving?

Thank you!

Bingo - AOS failure would cause precisely this. I'd not drive it until you r&r the AOS b/c a bad AOS can cause catastrophic engine failure (hydraloc in the cylinders by sucking in oil which does not compress like gasoline. It will be about $110 to DIY if you buy the parts from Sunset or Suncoast. Not an overly hard job - just kinda messy. Dealer R&R can run $800 so best to DIY. Here are some instructions:


also, clean out the throttle body when finished.

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Thank you! It's too late for the engine failure though!!

Compression on cyl. 1-3 was 105lbs./cuin. 4-6 ranged from 55-115lbs./cuin.. Cyl. 5 and 6 were 65 and 55 respectively.

As of today... The 4-6 head is off and almost ready to go back on. Everything looks great except for a chewed up cam bearing. Since the cam bearings are line bored into the head (no removable bearing) I'm at a loss on how to have it repaired???

Thank you for the help,

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