N20 couple of issues

fiedor901 · 02-27-2024, 03:34 PM

Hi, I recently bought 328xi from late 2014 with 88k kilometeres on it. Knowing the most popular issues, recently I changed (preventive) the timing chain, oil pump drive, rod bearings and spark plugs.

I noticed my engine runs kinda rough on cold start, when the RPM are going down there is some car shaking going on especcialy around 1000RPM. It's not shaking violently just slightly, thinking about checking the injectors and changing coils due to that they are still OEM.

Today I also noticed the rattle after slight rev to around 2500RMP, tho its only happening after startup no matter if the engine is hot or cold. It passes after a minute or two, is that a wastegate finishing its life? (video below)

https://www.youtube.com/shorts/LMTpQgh9Owk

Maybe someone can also identify the sqeeking sound when the camera gets closer to the engine, I only noticed this on the video, barely hearable IRL.

Thanks for any help

fe7565 · 03-05-2024, 06:30 PM

Did you replace the timing chain tensioner too?

I do not hear anything strange. My car also has some small uneven idle for the first few seconds after start up. If you are concerned, but cannot detect any major signs of problems, you may want to use ISTA+ and a $10 ENET cable to check if any hidden error codes reside.

fiedor901 · 03-13-2024, 03:38 PM

Hey, sure, tensioner was also replaced. I already know that the injector on the 1st cylinder doesn’t work as well as the other three, but it’s not yet nothing to worry about, it might be the reason why I expirniece slight shaking on coldstart. I’m more worried about the scratching sound you can hear on video when reving. I suspect the wastegate, car sound more like a diesel day by day depending how cold it is outside. :/

Taylorsi · 03-13-2024, 06:00 PM

fiedor901 I am getting ready to do timing chain/oil pump drive and want to change the rod bearings as well; my thread is not getting any traction so figured I'd ask you directly:

When changing the rod bearings, do you set everything to TDC, remove the oil pump/balance shaft unit, remove any timing locks to allow spinning the engine then replace bearings, set all back to TDC then reinstall oil pump/balance shafts?

Or do you leave everything set to TDC and just push the bearings out around the crank without rotating anything?

I appreciate any advice you can provide!

02-27-2024, 03:34 PM	#1
fiedor901 Registered 0 Rep 4 Posts Drives: BMW F30 Join Date: Feb 2024 Location: Poland iTrader: (0)	N20 couple of issues Hi, I recently bought 328xi from late 2014 with 88k kilometeres on it. Knowing the most popular issues, recently I changed (preventive) the timing chain, oil pump drive, rod bearings and spark plugs. I noticed my engine runs kinda rough on cold start, when the RPM are going down there is some car shaking going on especcialy around 1000RPM. It's not shaking violently just slightly, thinking about checking the injectors and changing coils due to that they are still OEM. Today I also noticed the rattle after slight rev to around 2500RMP, tho its only happening after startup no matter if the engine is hot or cold. It passes after a minute or two, is that a wastegate finishing its life? (video below) https://www.youtube.com/shorts/LMTpQgh9Owk Maybe someone can also identify the sqeeking sound when the camera gets closer to the engine, I only noticed this on the video, barely hearable IRL. Thanks for any help
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03-05-2024, 06:30 PM	#2
fe7565 Lieutenant Colonel 553 Rep 1,581 Posts Drives: 2012 BMW 328i N26 Join Date: Nov 2013 Location: United States iTrader: (0)	Did you replace the timing chain tensioner too? I do not hear anything strange. My car also has some small uneven idle for the first few seconds after start up. If you are concerned, but cannot detect any major signs of problems, you may want to use ISTA+ and a $10 ENET cable to check if any hidden error codes reside. __________________ Help each other: if you manage to fix your issue (especially with help from this forum), don't be a d*ck and disappear. Follow-up by posting the solution so you can help others.
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03-13-2024, 03:38 PM	#3
fiedor901 Registered 0 Rep 4 Posts Drives: BMW F30 Join Date: Feb 2024 Location: Poland iTrader: (0)	Hey, sure, tensioner was also replaced. I already know that the injector on the 1st cylinder doesn’t work as well as the other three, but it’s not yet nothing to worry about, it might be the reason why I expirniece slight shaking on coldstart. I’m more worried about the scratching sound you can hear on video when reving. I suspect the wastegate, car sound more like a diesel day by day depending how cold it is outside. :/
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03-13-2024, 06:00 PM	#4
Taylorsi Registered 0 Rep 4 Posts Drives: 2012 328i Join Date: Feb 2024 Location: Seattle iTrader: (0)	fiedor901 I am getting ready to do timing chain/oil pump drive and want to change the rod bearings as well; my thread is not getting any traction so figured I'd ask you directly: When changing the rod bearings, do you set everything to TDC, remove the oil pump/balance shaft unit, remove any timing locks to allow spinning the engine then replace bearings, set all back to TDC then reinstall oil pump/balance shafts? Or do you leave everything set to TDC and just push the bearings out around the crank without rotating anything? I appreciate any advice you can provide!
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