Squeak after hard acceleration

bimmerguy1210 · 11-10-2020, 12:32 PM

My 2007 335i makes this sort of squeak or higher pitched sound for a split second when letting off the throttle after medium/hard acceleration. The harder I snap my foot off the gas, the more pronounced the squeak is but I wouldn’t say that it’s loud and It can’t or can faintly be heard if music is playing. The squeak sounds like it’s coming from near the firewall on the engine side. I was doing some reading on dsm forums and it could be related to the BOV. I’m currently stage 2+ with upgraded CP but running factory diverter valves. I also have BMS cowl filters so most engine noises can be heard pretty well. Any idea if the squeak could be related to the dv’s? I’ll take a look inside the engine bay again but last I looked I didn’t notice anything unusual. Thanks!

BSM n54iS · 11-10-2020, 12:46 PM

You mean stock diverter valves? Sounds like a tiny leak somewhere... maybe it's time for an upgraded charge pipe/bov combo

Check the for sale section out I may have something for you

bimmerguy1210 · 11-10-2020, 12:54 PM

Yup stock diverter valves, and I have an upgraded charge pipe sorry shoulda mentioned that!

11-10-2020, 12:32 PM	#1
bimmerguy1210 Enthusiast 92 Rep 269 Posts Drives: E90 335i, E93 335i Join Date: Feb 2019 Location: Los Angeles iTrader: (0)	Squeak after hard acceleration My 2007 335i makes this sort of squeak or higher pitched sound for a split second when letting off the throttle after medium/hard acceleration. The harder I snap my foot off the gas, the more pronounced the squeak is but I wouldn’t say that it’s loud and It can’t or can faintly be heard if music is playing. The squeak sounds like it’s coming from near the firewall on the engine side. I was doing some reading on dsm forums and it could be related to the BOV. I’m currently stage 2+ with upgraded CP but running factory diverter valves. I also have BMS cowl filters so most engine noises can be heard pretty well. Any idea if the squeak could be related to the dv’s? I’ll take a look inside the engine bay again but last I looked I didn’t notice anything unusual. Thanks! __________________ E90 335i - Black w/ Black Interior - A/T - FBO - JB4 w/ MHD BEF E93 335i - Silver w/ Red Interior - 6MT - FBO w/ Pure600 turbos - Wedge Tune Last edited by bimmerguy1210; 11-10-2020 at 12:55 PM..
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11-10-2020, 12:46 PM	#2
BSM n54iS Brigadier General 2685 Rep 4,202 Posts Drives: '11 335is \| '16 Macan Turbo Join Date: Aug 2015 Location: Everywhere and Nowhere iTrader: (7)	You mean stock diverter valves? Sounds like a tiny leak somewhere... maybe it's time for an upgraded charge pipe/bov combo Check the for sale section out I may have something for you __________________ '11 335is BSM MT "BMW Performance Editon" \| '16 Porsche Macan Turbo GruppeM CF Intake \| AR Resonated DP \| ER CP \| Turbosmart RacePort BOV \| Cobb FMIC \| RB Inlets \| RB External Mishi/Turner OCC \| Michelin PS4 \| BMW Performance Springs/Bilstein B8 + Dinan & M3 bits \| BMW Brembo BBK \| BMW Performance CF Spoiler \| BMW Performance CF Lip \| BMW Performance Alcantara \| PS Designs GTS Armrest \| AG H6-40 \| Rear Seat Delete
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11-10-2020, 12:54 PM	#3
bimmerguy1210 Enthusiast 92 Rep 269 Posts Drives: E90 335i, E93 335i Join Date: Feb 2019 Location: Los Angeles iTrader: (0)	Yup stock diverter valves, and I have an upgraded charge pipe sorry shoulda mentioned that!
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