Cold Start

krono · 10-08-2019, 08:33 PM

Now that the weather is getting colder I've been noticing a thumping/thudding sound coming from the exhaust during cold starts. Not sure if this is something I should get checked out (no CEL etc.)...it's just a sound I never noticed during the summer. I found a youtube video that exhibits the same symptoms:

Sounds very similar to 0:11-0:15 and 0:30-0:32 except mine "thuds" a bit more.

Is this normal? Anyone else hear this during their cold starts?

nioh_lbbm2 · 10-08-2019, 08:56 PM

mine has always done this while i was on stock tune. its normal from what i've read while looking around

krono · 10-08-2019, 09:19 PM

Good to hear! Not sure why I never noticed before

F87source · 10-08-2019, 09:19 PM

Yeah I get that little burble too on start ups. I'm pretty sure that's just the way the car is tuned and there is a little bit of extra fuel that is injected during those situations.

krono · 10-09-2019, 04:23 PM

Thanks for the input guys. Nothing to worry about then!

F87source · 10-09-2019, 07:18 PM

Quote:

Originally Posted by krono

Thanks for the input guys. Nothing to worry about then!

Yup!

10-08-2019, 08:33 PM	#1
krono New Member 2 Rep 6 Posts Drives: M2 Join Date: Nov 2018 Location: Canada iTrader: (0)	Cold Start - Thumping Sound? Now that the weather is getting colder I've been noticing a thumping/thudding sound coming from the exhaust during cold starts. Not sure if this is something I should get checked out (no CEL etc.)...it's just a sound I never noticed during the summer. I found a youtube video that exhibits the same symptoms: Sounds very similar to 0:11-0:15 and 0:30-0:32 except mine "thuds" a bit more. Is this normal? Anyone else hear this during their cold starts?
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10-08-2019, 08:56 PM	#2
nioh_lbbm2 Lieutenant Colonel 1717 Rep 1,899 Posts Drives: M2 Join Date: Mar 2018 Location: California iTrader: (0)	mine has always done this while i was on stock tune. its normal from what i've read while looking around
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10-08-2019, 09:19 PM	#3
krono New Member 2 Rep 6 Posts Drives: M2 Join Date: Nov 2018 Location: Canada iTrader: (0)	Good to hear! Not sure why I never noticed before
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10-08-2019, 09:19 PM	#4
F87source Major General 7246 Rep 7,422 Posts Drives: Bmw M2 Join Date: Aug 2018 Location: . iTrader: (1)	Yeah I get that little burble too on start ups. I'm pretty sure that's just the way the car is tuned and there is a little bit of extra fuel that is injected during those situations. __________________ Click on the link below to see a compiled list of every review I have ever written: https://f87.bimmerpost.com/forums/sh...2#post30368242
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10-09-2019, 04:23 PM	#5
krono New Member 2 Rep 6 Posts Drives: M2 Join Date: Nov 2018 Location: Canada iTrader: (0)	Thanks for the input guys. Nothing to worry about then!
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