When the engine is rebuilt, R52 continues to rev high.

[Grundysp]

Last night I replaced the head gasket on my R52 Cooper S. The engine started up without a hitch, however it went into overdrive almost instantly (I neglected to check the engine rev limit). From what I can tell, it could be vacuum lines or low voltage levels; however, I have not been able to locate this specific issue on the forum; could you perhaps point me in the direction of a good starting point?

[Dudeta]

If you suspect a leak, whether it's from the intake, exhaust, or supercharger side, I recommend performing a smoke test and fixing any damaged components.

To find out what's going on, check the real-time data, which may include things like temperatures, throttle positions, fuel trims, and more.

[Grundysp]

I see. Is it possible that it can take in air too easily? It will be interesting to see what the code reader shows, which I borrowed today.

[Dudeta]

Great job! Please inform us of your findings so that we can guide you.

[Grundysp]

It seems like the engine is going straight onto boost, and I'm worried the bypass valve is stuck closed. The hoover connection might have been knocked off, so I should go see. It seems to be in line with it since I also received identical problem codes. Is it feasible to you?

[Dudeta]

Unexpectedly high or low readings outside of the sensor's parameters are definitely the result of something. I will have to look into what you suggest, but I don't know the system well enough to give it a specific name.

However, please inform us of the results of the checks.

[Accomis]

have air leaks Verify that the small black pipe connects to the supercharger horn; the end with the rubber cap has separated. same as before, smoulder it

[Grundysp]

Is that the short line that I've drawn here connecting the bypass valve's vacuum actuator to the horn side of the valve?

[Accomis]

Additionally, smoke testing will undoubtedly reveal whether the throttle body area, brake boost, and crankcase breather pipe snap off.

[Grundysp]