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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum Strange noise coming from engine (N55) 535i LCI
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      02-16-2024, 08:04 PM   #1
F10Abbas
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Strange noise coming from engine (N55) 535i LCI

Hello guys I noticed that thereís a strange noise coming near the firewall of the engine bay right where my fuel rail is. I had the valve cover replaced in 2/23. I know there is an oil leak and have the gasket on order to replace but could it possibly be related or is this normal? The noise was consistent until I turned the ac on and off then it started with the rhythm heard in the video. I turned the vehicle off and on again and the noise went away. Attached in the link is a video of the noise. https://youtube.com/shorts/ahG4WO2UmQ4?feature=shared
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      02-16-2024, 09:59 PM   #2
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A very strange noise indeed!
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      02-16-2024, 10:13 PM   #3
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1). Remove cover on R.H. side (above blower motor) and try the bower motor with ac on and off see if it is from blower motor.

2). See if noise/sound change when oil fill cap removed
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      02-17-2024, 08:44 AM   #4
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Quote:
Originally Posted by Conserve View Post
1). Remove cover on R.H. side (above blower motor) and try the bower motor with ac on and off see if it is from blower motor.

2). See if noise/sound change when oil fill cap removed
I will try these both later today, itís very strange because it will still make the noise even if the ac is completely off.
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      02-17-2024, 01:55 PM   #5
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It sounds like the diaphragm inside the pressure converter/boost solenoid (part no. 11747649407). I had 2 of mine fail and it would make this noise if I had gotten into the boost hard. A small blip of the throttle would make the noise stop. LCI 535i models up until a build date of 07/2014 have a PWG. EWG N55s don't have this boost solenoid.
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      02-18-2024, 04:17 PM   #6
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Quote:
Originally Posted by GrabacrOne View Post
It sounds like the diaphragm inside the pressure converter/boost solenoid (part no. 11747649407). I had 2 of mine fail and it would make this noise if I had gotten into the boost hard. A small blip of the throttle would make the noise stop. LCI 535i models up until a build date of 07/2014 have a PWG. EWG N55s don't have this boost solenoid.
^^^ This 99%. I've been through four. Relatively inexpensive. Relatively easy to replace (a bit of a PITA fighting with 10mm sockets and stuff but what you're trying to do is easy.)
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      02-18-2024, 07:25 PM   #7
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Quote:
Originally Posted by GrabacrOne View Post
It sounds like the diaphragm inside the pressure converter/boost solenoid (part no. 11747649407). I had 2 of mine fail and it would make this noise if I had gotten into the boost hard. A small blip of the throttle would make the noise stop. LCI 535i models up until a build date of 07/2014 have a PWG. EWG N55s don't have this boost solenoid.
Thank you guys. I believe this is the answer as I have pinned the noise right to the solenoid so I will be replacing it alongside with my valve cover gasket.
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