2011 318d N47T Intermittent rough idle

ellzkellz · 06-23-2021, 07:45 AM

Hi,

I own a BMW 2011 318d. It's developed an intermittent rough idle / rev bounce.
I tried checking for fault codes, was o2 sensor I have changed that with genuine bosch. Also had DPF Regen code.
If I clear the codes my rough idle goes away for a good couple of weeks.

I start to notice it after 5-10 mins of driving. When I come to a stop the rev needle starts bouncing up and down, and it sounds like it's misfiring / about to stall but the revs auto jump up to save it without any throttle input.
As soon as I give it any power or slightly let out the clutch the engine runs smooth again, it's like there's no issue. This rough idle is happening for a good 20mins and then goes away.
I can still use stop-start while the rough idle is on.

Very concerned any help would be very much appreciated

Thanks.

David Visnjic · 12-05-2023, 02:41 AM

Hi, i have the same thing happening to me, the only difference is that the rough idle goes on for about 1-2 minutes. Did you maybe find out what the issue was?

06-23-2021, 07:45 AM	#1
ellzkellz Registered 0 Rep 2 Posts Drives: 2011 BMW 318d Join Date: Aug 2020 Location: UK iTrader: (0)	2011 318d N47T Intermittent rough idle Hi, I own a BMW 2011 318d. It's developed an intermittent rough idle / rev bounce. I tried checking for fault codes, was o2 sensor I have changed that with genuine bosch. Also had DPF Regen code. If I clear the codes my rough idle goes away for a good couple of weeks. I start to notice it after 5-10 mins of driving. When I come to a stop the rev needle starts bouncing up and down, and it sounds like it's misfiring / about to stall but the revs auto jump up to save it without any throttle input. As soon as I give it any power or slightly let out the clutch the engine runs smooth again, it's like there's no issue. This rough idle is happening for a good 20mins and then goes away. I can still use stop-start while the rough idle is on. Very concerned any help would be very much appreciated Thanks.
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12-05-2023, 02:41 AM	#2
David Visnjic Registered 0 Rep 2 Posts Drives: BMW e91 Touring 316D Join Date: Nov 2023 Location: Norway iTrader: (0)	Same Issue Hi, i have the same thing happening to me, the only difference is that the rough idle goes on for about 1-2 minutes. Did you maybe find out what the issue was?
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