Smoke test s65 engine?

Alexei9012 · 06-06-2024, 07:10 AM

Hey guys I think I have a vacuum leak and was researching how to smoke test to find where it’s coming from. I’ve found nothing… is it even possible to smoke test the s65?

amrazM · 06-06-2024, 07:50 AM

its not really possible to have much of a vacuum leak on this engine due to the lack of maf and where the throttle blades are in relation to the combustion chamber. what issues you having?

Redd · 06-06-2024, 06:54 PM

Check the IAT sensor hole. I chased an intake air leak for months due to misfires. Smoke/water tested the plenum but found nothing. Turns out the IAT sensor hole had the tabs damaged and it was leaking only under vacuum. Good luck. I effing hate chasing air leaks.

Alexei9012 · 06-06-2024, 10:30 PM

Quote:

Originally Posted by amrazM

its not really possible to have much of a vacuum leak on this engine due to the lack of maf and where the throttle blades are in relation to the combustion chamber. what issues you having?

Yeah i was thinking that. just have a rough idle and a whistling sound on acceleration

Alexei9012 · 06-06-2024, 10:33 PM

Quote:

Originally Posted by Redd

Check the IAT sensor hole. I chased an intake air leak for months due to misfires. Smoke/water tested the plenum but found nothing. Turns out the IAT sensor hole had the tabs damaged and it was leaking only under vacuum. Good luck. I effing hate chasing air leaks.

i have not looked into this but i will have a look. thank you

Redd · 06-07-2024, 05:04 AM

Quote:

Originally Posted by Alexei9012

Yeah i was thinking that. just have a rough idle and a whistling sound on acceleration

These may be two separate issues. Idle may be ICV. Whistling may be this.

06-06-2024, 07:10 AM	#1
Alexei9012 New Member 14 Rep 15 Posts Drives: BMW M3 E92 Join Date: Apr 2022 Location: Melbourne Australia iTrader: (0)	Smoke test s65 engine? Hey guys I think I have a vacuum leak and was researching how to smoke test to find where it’s coming from. I’ve found nothing… is it even possible to smoke test the s65?
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06-06-2024, 07:50 AM	#2
amrazM mTekMods 2478 Rep 3,150 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	its not really possible to have much of a vacuum leak on this engine due to the lack of maf and where the throttle blades are in relation to the combustion chamber. what issues you having? __________________ E90M3 - Satin Black F97 X3M - Brooklyn Grey E39 M5 - Silverstone
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06-06-2024, 06:54 PM	#3
Redd Brigadier General 5039 Rep 4,842 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	Check the IAT sensor hole. I chased an intake air leak for months due to misfires. Smoke/water tested the plenum but found nothing. Turns out the IAT sensor hole had the tabs damaged and it was leaking only under vacuum. Good luck. I effing hate chasing air leaks.
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