Pop/bang/shake when start/stop turns the engine off?

SantaEugence · 07-13-2019, 05:39 PM

So I know start/stop hasn't the greatest fan base so that aside...
Quite often when it turns the engine off I get an audible bang which seems to come from the exhaust and also the back end shudders slightly. Other times it turns off almost silently.
The shudder and bang is concerning me, is this normal or is there something wrong?
Replies saying turn off stop/start not welcome

It's a 2014 330d
Cheers!

bloodline129 · 07-13-2019, 06:52 PM

Quote:

Originally Posted by SantaEugence

So I know start/stop hasn't the greatest fan base so that aside...
Quite often when it turns the engine off I get an audible bang which seems to come from the exhaust and also the back end shudders slightly. Other times it turns off almost silently.
The shudder and bang is concerning me, is this normal or is there something wrong?
Replies saying turn off stop/start not welcome

It's a 2014 330d
Cheers!

How rude, looks like no one is welcome to this thread lol. To the question at hand, I got no idea what that could be at the back? Your exhaust valve closing? But it really wouldn't go "bang"
Maybe ur transfer case had enough of that start stop?

Team "no start/stop"

Billfitz · 07-13-2019, 09:04 PM

I'm not necessarily against the ASS, but I really don't see the need with a diesel. Unlike gasoline engines diesel engines operate at close to maximum thermal efficiency even when idling, so much less fuel is used than with a gasoline engine left running. Add in the higher stress on the battery and starter because of the far higher compression ratio of diesel and using ASS with diesel IMO isn't a worthwhile mechanism.

MmmmmM2 · 07-14-2019, 10:13 AM

Quote:

Originally Posted by Billfitz

I'm not necessarily against the ASS, but I really don't see the need with a diesel. Unlike gasoline engines diesel engines operate at close to maximum thermal efficiency even when idling, so much less fuel is used than with a gasoline engine left running. Add in the higher stress on the battery and starter because of the far higher compression ratio of diesel and using ASS with diesel IMO isn't a worthwhile mechanism.

Heh....You said ASS!

jh_f30 · 07-14-2019, 10:51 AM

Quote:

Originally Posted by F30ZHP

Quote:

Originally Posted by Billfitz

I'm not necessarily against the ASS, but I really don't see the need with a diesel. Unlike gasoline engines diesel engines operate at close to maximum thermal efficiency even when idling, so much less fuel is used than with a gasoline engine left running. Add in the higher stress on the battery and starter because of the far higher compression ratio of diesel and using ASS with diesel IMO isn't a worthwhile mechanism.

Heh....You said ASS!

I'm actually a big fan of ASS!

As far as auto start-stop, I have it coded off.

Sorry, I have no real advice or suggestions on what it might be, just couldn't help myself.

J-RO · 07-15-2019, 04:02 PM

Code the ASS out.

bimmer456 · 07-15-2019, 04:05 PM

Does it keep the glow plugs lit in the ASS with diesel?

Billfitz · 07-15-2019, 04:24 PM

Quote:

Originally Posted by J-RO

Code the ASS out.

If he wants to use it that's his preference and his business. If you don't that's your preference and your business. In this case your reply is downright rude, or didn't you bother to read where the OP said "Replies saying turn off stop/start not welcome" ?

J-RO · 07-15-2019, 08:34 PM

Quote:

Originally Posted by Billfitz

If he wants to use it that's his preference and his business. If you don't that's your preference and your business. In this case your reply is downright rude, or didn't you bother to read where the OP said "Replies saying turn off stop/start not welcome" ?

I guess I missed that.

Livetodrive · 07-16-2019, 09:53 AM

Although I don't have a diesel, there is no bang, pop or shake with my start/stop. I'd guess something is wrong with your car.

SantaEugence · 07-17-2019, 09:41 AM

The more I read about it, the less I'm convinced by it unfortunately. I've accepted I'm not going to be getting the mpg I thought I could, so I'll be going back to 'comfort' rather than eco pro and coding the ASS off.
That being said, since I bought the car less than 6 months ago the garage still have an obligation to repair any faults - if the ASS banging (sorry couldn't help it

) isn't normal I'll have it looked it.
Thanks for the replies

07-13-2019, 05:39 PM	#1
SantaEugence Major 475 Rep 1,325 Posts Drives: F30 330d xDrive Auto Join Date: Mar 2019 Location: UK iTrader: (0)	Pop/bang/shake when start/stop turns the engine off? So I know start/stop hasn't the greatest fan base so that aside... Quite often when it turns the engine off I get an audible bang which seems to come from the exhaust and also the back end shudders slightly. Other times it turns off almost silently. The shudder and bang is concerning me, is this normal or is there something wrong? Replies saying turn off stop/start not welcome It's a 2014 330d Cheers!
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07-13-2019, 09:04 PM	#3
Billfitz Lieutenant General 8243 Rep 16,082 Posts Drives: '15 328iX GT Join Date: Jan 2015 Location: New Hampshire iTrader: (0)	I'm not necessarily against the ASS, but I really don't see the need with a diesel. Unlike gasoline engines diesel engines operate at close to maximum thermal efficiency even when idling, so much less fuel is used than with a gasoline engine left running. Add in the higher stress on the battery and starter because of the far higher compression ratio of diesel and using ASS with diesel IMO isn't a worthwhile mechanism.
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07-15-2019, 04:02 PM	#6
J-RO Lieutenant Colonel 2095 Rep 1,861 Posts Drives: BMW M240ix Join Date: Jun 2019 Location: A Place I Like To Call “You’ll See” iTrader: (0)	Code the ASS out.
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07-15-2019, 04:05 PM	#7
bimmer456 Major General 2961 Rep 5,997 Posts Drives: 340i Join Date: Nov 2016 Location: Pasadena, CA iTrader: (0)	Does it keep the glow plugs lit in the ASS with diesel?
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07-16-2019, 09:53 AM	#10
Livetodrive Second Lieutenant 109 Rep 295 Posts Drives: 2016 340i X Drive Join Date: Dec 2015 Location: Pa. iTrader: (0) Garage List 2016 BMW 340i XDrive [0.00]	Although I don't have a diesel, there is no bang, pop or shake with my start/stop. I'd guess something is wrong with your car.
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07-17-2019, 09:41 AM	#11
SantaEugence Major 475 Rep 1,325 Posts Drives: F30 330d xDrive Auto Join Date: Mar 2019 Location: UK iTrader: (0)	The more I read about it, the less I'm convinced by it unfortunately. I've accepted I'm not going to be getting the mpg I thought I could, so I'll be going back to 'comfort' rather than eco pro and coding the ASS off. That being said, since I bought the car less than 6 months ago the garage still have an obligation to repair any faults - if the ASS banging (sorry couldn't help it ) isn't normal I'll have it looked it. Thanks for the replies
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