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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Boost Solenoid High Pitch Noise



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      06-07-2019, 01:45 PM   #1
AX75F92
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Boost Solenoid High Pitch Noise

Hey guys. I?ve noticed some high pitch noise/buzz/whine sound coming from my boost solenoid. I can hear it anytime the electrical system of the car is on. Even just unlocking the car with the engine off for example.

Car is FBO with JB4. I purchased the JB4 used off the forum. It?s the older harness that has the red power wire that should go to the 50amp fuse, however the previous owner modified it so the red wire incorporates into the boost solenoid connector like the newer style harness.

Anyone experience noise this before?
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      06-07-2019, 02:25 PM   #2
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Originally Posted by AX75F92 View Post
Hey guys. I?ve noticed some high pitch noise/buzz/whine sound coming from my boost solenoid. I can hear it anytime the electrical system of the car is on. Even just unlocking the car with the engine off for example.

Car is FBO with JB4. I purchased the JB4 used off the forum. It?s the older harness that has the red power wire that should go to the 50amp fuse, however the previous owner modified it so the red wire incorporates into the boost solenoid connector like the newer style harness.

Anyone experience noise this before?
Yes the boost solenoids fail.. just replace it..
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      06-07-2019, 04:53 PM   #3
weehe126
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Are you having any issues?
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      06-07-2019, 10:32 PM   #4
AX75F92
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Are you having any issues?
Nope. No issues at all.
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      06-07-2019, 11:54 PM   #5
weehe126
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Originally Posted by AX75F92 View Post
Nope. No issues at all.
Sometimes they make noise and have no issues. They are a known failure part so wouldn't hurt to have a new one on hand. Could also disconnect it and reconnect it and see if it stops.
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