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Siderick Siderick is offline
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Car: 435i
Default Does someone recognize this sound? - 05-19-2021, 02:05 PM

Hello,
Does someone know what could be causing this strange sound?. It's always there at iddle. When I accelerate it does not speed up in the same way the engine does. I can go to 3K and the sound just speeds up a little bit. Some say it is a belt, others the injectors (Doesn't make sence to me if it doesn't speed up the same way the engine does).. I really don't know where to start looking. Please, if you know what could be me and my car would really appreciate it!...

Car: Bmw 435i 2014 + JB4

Video:
Bmw 435i F32 weird cricket sound - YouTube

Thanks!
Attached Files
File Type: zip BMW-435-sound.zip (85.0 KB, 23 views)

Last edited by Siderick; 05-21-2021 at 01:12 PM..
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scheib scheib is offline
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Default 05-20-2021, 04:54 AM

I'm assuming your mic is in front of the engine with the hood open?

If it doesn't change with RPM, it would have to be electric right? Coolant pump or fuel pump. Put your stethoscope near the front right of the engine compartment. If it is coming from that direction, take off your under shielding to get better access to the coolant pump.

Btw, sounds like a cricket to me.

Jay


2013 BMW 335i F30 JB4
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Siderick Siderick is offline
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Default 05-21-2021, 10:18 AM

Thank you Jay,
Here is a longer video with more detail. I think it has gotten louder. Where and what do you suggest I should start looking?
Thanks!

Bmw 435i F32 weird cricket sound - YouTube

Bmw 435i F32 weird cricket sound - YouTube
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drwillb drwillb is offline
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Car: 2012 n55 135i
Default 05-21-2021, 02:40 PM

The pace of the sound changes with RPM but not at the same rate as the engine. Probably something that is turned by the serpentine belt but not at the same rate as the crank. Start with alternator then look at PS pump. Get one of those stethoscopes for engine diagnosis or go old school with a long screwdriver and put your ear to the handle after putting the tip on what you want to inspect.

There's also a vacuum pump in there somewhere.

Then there's always VANOS but if you haven't thrown codes that probably OK.


2012 135i Mods: air scoops, CP, K&N filter, PS1, ADE FMIC, BMW PE, JB4, 1M front body, full M3 suspension front and rear, M3 brakes front and rear, M3 rear subframe and LSD

Owned so far: 88 M3 x 2, 95 325is, 95 M3 x 2, 06 Mini Cooper S, 08 335 xi, 09 Z4 35i, 01 M3, 12 135i
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Choyo_n55 Choyo_n55 is offline
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Default 05-22-2021, 06:12 AM

I have a friend with the same problem, it turned out to be a water pump, shadow codes for it had appearedщ


2011 e90 n55, vrsf down pipe,cp,fmic jb4,AT xhp stage3
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Siderick Siderick is offline
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Default 05-22-2021, 07:41 AM

Thank you..
Jb4 doesn't show any error code. Don't know how accurate is it. Should I look for a scanner anyway?
Thx
Cheers!
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scheib scheib is offline
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Default 05-24-2021, 05:21 AM

Invest in a stethoscope. If it's a medical type, take the end off so there is an open tube. When you get close to the chirping component it will be obvious.


2013 BMW 335i F30 JB4
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