Motor knock on left side at idle only.

MrS3anW · 04-26-2021, 01:35 PM

I started my car yesterday and let it run for a few minutes before leaving to let it warm up a bit, I came out to leave and the car had a decent knock coming from the CP side of the motor and it’s only at idle.

I recently replaced the turbos so I know there’s oil and everything external has been inspected, the car was running great finally after 5 months of fighting with it. The car isn’t throwing any codes and it’s never made any knocking noise in the past, any help would be greatly appreciated as I have been fighting with this car for too long.

Please help.

iqraceworks · 04-26-2021, 02:42 PM

Video of it?

E92.Dom · 04-26-2021, 03:31 PM

Maybe it's one of your belts?

Brandoch · 04-26-2021, 04:41 PM

It's probably the purge valve. If it is, it's normal.

studio54 · 04-26-2021, 04:43 PM

isn't the fuel tank breather valve or something like that just under the CP area that clicks sometimes

Dave92N54 · 04-26-2021, 04:55 PM

Most likely evap valve, normal. Mine is actually super audible and ticks 98% of the time at idle. My understanding is there is no real need to replace it unless getting codes but I may do so soon just to see if it starts ticking less.

relative4 · 04-26-2021, 06:51 PM

I don't hear anything.

04-26-2021, 01:35 PM	#1
MrS3anW New Member 0 Rep 19 Posts Drives: 2008 & 2011 BMW 335i Join Date: Jan 2021 Location: Seattle iTrader: (0)	Motor knock on left side at idle only. I started my car yesterday and let it run for a few minutes before leaving to let it warm up a bit, I came out to leave and the car had a decent knock coming from the CP side of the motor and it’s only at idle. I recently replaced the turbos so I know there’s oil and everything external has been inspected, the car was running great finally after 5 months of fighting with it. The car isn’t throwing any codes and it’s never made any knocking noise in the past, any help would be greatly appreciated as I have been fighting with this car for too long. Please help.
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04-26-2021, 02:42 PM	#2
iqraceworks Brigadier General 2109 Rep 3,811 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Video of it?
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04-26-2021, 03:31 PM	#3
E92.Dom Private First Class 66 Rep 156 Posts Drives: 2012 bmw e92 335i Join Date: Oct 2018 Location: New Jersey iTrader: (0)	Maybe it's one of your belts?
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04-26-2021, 04:41 PM	#4
Brandoch Captain 1022 Rep 926 Posts Drives: 2009 E93 M3 DCT Join Date: Dec 2017 Location: BC Canada iTrader: (0) Garage List 2009 BMW E93 M3 [9.75] 2011 BMW F25 X3 28i [8.50]	It's probably the purge valve. If it is, it's normal.
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04-26-2021, 04:43 PM	#5
studio54 Captain 206 Rep 714 Posts Drives: n54 Join Date: Feb 2017 Location: belgium iTrader: (0)	isn't the fuel tank breather valve or something like that just under the CP area that clicks sometimes __________________ beter laat dan nooit
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04-26-2021, 04:55 PM	#6
Dave92N54 Major 538 Rep 1,173 Posts Drives: 09 E92 335i 6MT Join Date: Nov 2020 Location: Westminster, Maryland iTrader: (0) Garage List 2009 BMW 335i [10.00]	Most likely evap valve, normal. Mine is actually super audible and ticks 98% of the time at idle. My understanding is there is no real need to replace it unless getting codes but I may do so soon just to see if it starts ticking less. __________________ 09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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04-26-2021, 06:51 PM	#7
relative4 Major 621 Rep 1,280 Posts Drives: '08 335xi E90 MT stage 1+ Join Date: Feb 2019 Location: Denver, CO iTrader: (0)	I don't hear anything.
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