Engine Acceleration reduces with a mild hissing sound from engine bay

[bildiagnose2017]

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[Salty B.]

Originally Posted by andrewwynn

Can you read the cam position realtime and can you graph?

I have no idea how to do that, but I'll see if the code reader can show me once I get the doors put back together.

[andrewwynn]

I know I used the foxwell to do this. I've had similar power loss on n52 motor from the oil filter cage and from dirty vanos solenoid.

Our m54s both had CPS soft fail approximately 130,000 miles. That however presented as engine stall during slow speed throttle.

The hissing suggests CCV?

[Salty B.]

Originally Posted by andrewwynn

I know I used the foxwell to do this. I've had similar power loss on n52 motor from the oil filter cage and from dirty vanos solenoid.

Our m54s both had CPS soft fail approximately 130,000 miles. That however presented as engine stall during slow speed throttle.

The hissing suggests CCV?

No stalling. Power seems as usual, aside from the occasional unintended deceleration blip. Some days it's fine. Once it happened with cruise control on at 70mph but only for a second or two.

CCV was replaced about 30K ago, 2019, with "PCV system w/o-rings" according to maintenance spreadsheet, along with something called "Pilot Mod to CCV" a few months later. Unsure what that means. The hiss is very brief and high-pitched, like a chirp almost, and only on shutdown. Crankcase does not appear to be under pressure if I pull the dipstick or fill cap.

Can the solenoid be cleaned? They're not cheap.

[andrewwynn]

Solenoid can be cleaned. Not a difficult task YouTube will have videos how.


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[kancho]

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