E90Post
 


 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Acceleration issues below 2.5k-rpm, rattling sound, 320i e92 2008



Reply
 
Thread Tools Search this Thread
      06-18-2019, 05:30 AM   #1
nocaig
Registered
0
Rep
2
Posts

Drives: BMW 320i 2008 E92
Join Date: Jun 2019
Location: New Zealand

iTrader: (0)

Unhappy Acceleration issues below 2.5k-rpm, rattling sound, 320i e92 2008

Hello all!

My first post after being a thread stalker for about the past year and unfortunately it's not on good terms.

For the last 3-4 months, I have had an ongoing issue of:

upon cold start (with the mornings/nights being particularly cold) there is a loud rattling (almost like a marble in the engine) noise, this is present during idle and when accelerating in low rpms (up to about 2.5rpm). If I accelerate anywhere below 2.5rpm this rattling noise + a massive lack of power in acceleration is present. (the noise not being my main concern). The noise will usually disappear once the engine is warm however it is becoming worse.

My main concern is, its gotten to the point that anytime my foot is 3/4 (or less) of the way to the floor and I am under 2.5rpm when trying to accelerate I kid you not I either gain no speed or actually lose speed. If I plant my foot the engine will gradually accelerate but not at the expected pace.

The car just feels like there is nothing there when below 2.5rpm and it is getting worse and worse by the day to the point that I believe any relatively steep hill would be impossible to make it up and it just feels like it is going to breakdown any moment.

As soon as it hits about 3km there is a huge gradual surge of power as if its finally waking up and in a sense feels right again.

The problem was minor a couple months ago and is slowly getting worse. It did not seem apparent when I bought the car almost a year ago.

I am not 100% the noise and acceleration issue are related however it does feel/sound like they go hand in hand.

I have replaced the coil packs as this was my first thought when I first encountered the problem and have taken to the belt with a tensioner. I have recently had the spark plugs replaced too. No bad codes I have taken the vehicle to my mechanic 3 times for the same issue with their investigations always resulting in nothing found.

I am suspecting the Vanos at this point but I am by no means I BMW pro.

Car is 2008 320i e92 with 105000km on the clock, auto trans.

Any help would be greatly appreciated!
Appreciate 0
      06-18-2019, 07:05 AM   #2
porsche959
Banned
471
Rep
996
Posts

Drives: porsche
Join Date: Jul 2018
Location: chicago

iTrader: (0)

sounds like coils to me - whoops, didnt read. sorry hope u figure it out
Appreciate 0
      06-18-2019, 07:33 AM   #3
UK_Nomad
Private First Class
44
Rep
103
Posts

Drives: 2007 E93 325i Cabriolet
Join Date: Oct 2017
Location: South Northumberland UK

iTrader: (0)

Which engine? Are you getting any error codes?

I was getting random Vanos errors, had a light "lifter tick" noise, poor low-down power, and lousy fuel consumption Any of this sound familar?
Cleaning the Vanos filters gave a massive improvement https://www.e90post.com/forums/showthread.php?t=900394
__________________
Ex BMW owner (2007 E93 325i, E36 325i & 328i from the 90's)
Appreciate 0
      06-26-2019, 08:15 PM   #4
nocaig
Registered
0
Rep
2
Posts

Drives: BMW 320i 2008 E92
Join Date: Jun 2019
Location: New Zealand

iTrader: (0)

UK_Nomad

N43

No error codes what so ever. Mechanic has had it the last 4 days testing and is getting no where

Sounds very familiar, will give it a try!

Thank you!
Appreciate 0
      06-27-2019, 12:06 AM   #5
N52bigblock
Second Lieutenant
99
Rep
237
Posts

Drives: 2005 E90 330i
Join Date: Jan 2019
Location: NZ

iTrader: (0)

Quote:
Originally Posted by nocaig View Post
UK_Nomad

N43

No error codes what so ever. Mechanic has had it the last 4 days testing and is getting no where

Sounds very familiar, will give it a try!

Thank you!
I would be willing to wager it's your timing chain and/or chain guides and tensioner. N43 and N46 engines are REALLY bad for stretching the timing chain. If the engine continues to be used with this issue the chain gets so loose that it starts breaking the plastic chain guides. Those small pieces then fall into the sump and get sucked into the oil pickup and eventually it will starve the engine of oil, then it's all over for the engine. I have seen the chain snap before as well, that then bends all the valves. I would take it to BMW a dealer or BMW specialist and get them to check the timing chain straight away, like yesterday. I could be wrong but there is a very strong chance I'm not.

This is the procedure to do it.
https://www.newtis.info/tisv2/a/en/e...aft/1VnYmIaqqt
There is a special tool needed which only BMW or a BMW specialist will have.

Google BMW N43 N46 timing chain and you will see how big the issue is.
Appreciate 0
      07-01-2019, 08:42 AM   #6
janpavlik
New Member
1
Rep
21
Posts

Drives: BMW E90 320i
Join Date: Feb 2019
Location: Czech Republic

iTrader: (0)

Does your car run in valvetronic mode? Check it with ISTA-D. There could be faulty valvetronic and the car could run in limp mode. Also try to clean and test your solenoids (this way:/www.youtube.com/watch?v=kWQ-ZDzD0Lo&t=307s). Use your car battery. Also you can try to de/activate vanos units intake/exhaust in ISTA-D/INPA and check if the noise stops. It would be faulty solenoid/vanos unit if the rattle stops. If it is faulty valvetronic (you will see in ISTA) check your eccentric shaft sensor for oil and try to re-learn limits of valvetronic motor in ISTA. If it fails to learn, it will be probably damaged vvt motor or damaged ecc shaft, if there is a oil in sensor - replace it (or clean with brakes cleaner until replacing). The worst is bad timing or stretched chain but you would probably notice huge lack of power in higher RPMs and very bad cold starts.

Without testing in ISTA/INPA it is impossible to find the problem but if you do it can tell you a lot. Check VVT adaptions, VANOS adaptions, positions of camshafts, knocking, lambdas.

If I was you, I would start with cleaning solenoids, reseting adaptions and checking what goes to red numbers first in INPA. Then testing in ISTA and lastly replacing any parts without knowing why.

Good luck!

EDIT: If your engine has the vanos filters also check/replace them together with solenoids.
Appreciate 0
      07-02-2019, 08:50 AM   #7
Sayek
First Lieutenant
Sayek's Avatar
49
Rep
394
Posts

Drives: E92 320i LCI
Join Date: May 2016
Location: London

iTrader: (0)

I have the N43 engine and experienced same symptoms.
At that mile I would eliminate possible faulty injectors before you spend money elsewhere. Check the spark plug condition for clues.

From what you described its same as what another member posted few weeks ago.

https://www.e90post.com/forums/showthread.php?t=1628142
Appreciate 0
Reply

Bookmarks

Tags
2008, 320i, acceleration issue, acceleration noise, acceleration problems, e92, loss of power, poor performance, rattling noise

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:19 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST