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Anyone Else Having This Problem

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Recently replced engine in 990 LS400. Runs great but notice alot of moisture out of the exhaust and after replacing on knock sensor I am getting trouble codes 52 and 55. Any help would be greatly appreciated.

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Is coolant staying full? Sounds like a blown head gasket leaking coolant into cylinder and coming out exhaust. If coolant not leaking down then this isn't the problem so easy to check.

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Is coolant staying full? Sounds like a blown head gasket leaking coolant into cylinder and coming out exhaust. If coolant not leaking down then this isn't the problem so easy to check.

Thankyou for the reply. The coolant level is normal, oil is coolant free and compression is ideal on every cylinder.

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Maybe a failed ACV valve in your power steering pump. When if goes it allows power steering fluid to leak into the intake manifold. When it burns creates white smoke. Many posts here about how to fix this.

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Just replaced both knock sensors, still getting codes52,55 . Anyone have any ideas? Most appreciated

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Just replaced both knock sensors, still getting codes52,55 . Anyone have any ideas? Most appreciated

Bad tank of fuel? go to different place and get a fresh tank of premium? Then disconnect battery for a bit to clear codes and see how quickly the 52/55 duo returns.

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COdes return after around 2,000 rpms. The did sit for four years. I pumped the tank out and replaced fuel twice along with fuel. After reading and searching I'm thinkg tune up, temp registration, and a few hot laps. Don't know.

I'm stummed. Again, thanks

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This sounds identical to a problem I am having. I heard a "pop" and suddenly had no acceleration. I could not find anything on a acv valve. Could someone help me find some posts on here. Thanks.

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