E90Post
 


TNT Racewerks
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Diagnose my issue: N52 Fluctuating Power



Reply
 
Thread Tools Search this Thread
      12-31-2011, 01:23 PM   #45
chrismanchr
Second Lieutenant
17
Rep
228
Posts

Drives: 1986 mr2 mk1
Join Date: Mar 2011
Location: manchester england

iTrader: (0)

ive got exactly the same problem changed the plugs and coils no difference ,i got a yellow engine light up for about a week but while the light was up it ran great ,it went out and went back to its stuttering jerky self ,cleaned the maf etc ,i'm gonna have to bite the bullet and take it to a bmw specialist ,i hate paying for labour !
Appreciate 0
      12-31-2011, 04:04 PM   #46
BRGmatthew
Bausman
BRGmatthew's Avatar
United_States
63
Rep
1,817
Posts

Drives: around the block
Join Date: Sep 2009
Location: SoCal 626/NorCal 650

iTrader: (19)

Quote:
Originally Posted by chrismanchr View Post
ive got exactly the same problem changed the plugs and coils no difference ,i got a yellow engine light up for about a week but while the light was up it ran great ,it went out and went back to its stuttering jerky self ,cleaned the maf etc ,i'm gonna have to bite the bullet and take it to a bmw specialist ,i hate paying for labour !
Yeah, I did the same. I disconnected the MAF for a while. Car ran just fine. Cleaned the MAF, put it back on, plugged it back in. Same thing happened, jerky and weird. Took it to the dealer. They said it was because my intake and exhaust is causing my MAF to read too much airflow. I connected my own OBD2 scanner and it says my engine is running lean.
Appreciate 0
      01-03-2012, 12:18 PM   #47
temporarychicken
New Member
United Kingdom
2
Rep
8
Posts

Drives: 330ci E92
Join Date: Dec 2011
Location: UK south coast

iTrader: (0)

Interestingly, on the E90 series with the N52 engines, the MAF sensor is not a primary sensor.

On older models, the MAF was critical to measuring input airflow, and the output from the maf fed directly into the fuel calculation.

It seems now that on the E90 N52 cars, that the MAF is just a secondary sensor, and the output from it is only used for minor trim changes from the basic fuel map.

So when you unplug it, the ECU just goes to using default values which were hardcoded from new, and although theses values are not optimal for economy, they sure seem to be for power, since the car went like new when the MAF was disconnected.

However, drive it without a MAF for more than a minute and the DME will throw a yellow CEL on the dash since it's not heard from the MAF for a while.

I've ordered a cheap cable from Ebay to see if I can't access the history of fault codes...
Appreciate 0
      08-31-2012, 07:16 PM   #48
Three_thirty_I
Lieutenant Colonel
Three_thirty_I's Avatar
South Africa
198
Rep
1,834
Posts

Drives: '05 E90 330i Manual
Join Date: Aug 2010
Location: Cape Town, South Africa

iTrader: (0)

Garage List
Resurrecting this thread since I am experiencing some of these same problems to a certain degree and already been busy replacing things without any change, annoyingly! I do feel that the BMS PBX aggravates these problems, but not cause them if that makes sense.

The biggest issue that I am having at the moment that I am trying to solve is the pinging or knocking between 1800 and 2500 rpm, mostly at moderate throttle inputs, but have noticed it on gear changes when driving a bit more spiritedly. So very annoying! And also have that dull performance drop off from 3000 - 4500 rpm before the power comes back like crazy! Hesitation has been there from day one and very irritating, and certainly not something that I would have expected from a BMW!

Today I tested something out (did something that I have indirectly trained myself not to do), I mashed the throttle while in 4th at around 60 - 80 km/h and get that sudden hesitation. Try it again soon after and it's fine, but let the car settle and maybe try 5th gear and again, mash the throttle and there's that somewhat violent hesitation.

Engine also feels lumpy to me - off throttle and there is an overrun jerk, then gently feed power back on and there is a slight jerk, so not the refinement that I want at all. Bought some Liqui Moly injector cleaner which I am going to try out and see, but I somehow doubt that this is going to help, and I am really now getting to the end of my patience with this car!
__________________
BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03

Appreciate 0
      09-25-2012, 08:21 AM   #49
MrQuickR1
Second Lieutenant
MrQuickR1's Avatar
41
Rep
284
Posts

Drives: 2011 328i
Join Date: Jan 2012
Location: NJ

iTrader: (0)

Quote:
Originally Posted by Three_thirty_I View Post
Resurrecting this thread since I am experiencing some of these same problems to a certain degree and already been busy replacing things without any change, annoyingly! I do feel that the BMS PBX aggravates these problems, but not cause them if that makes sense.

The biggest issue that I am having at the moment that I am trying to solve is the pinging or knocking between 1800 and 2500 rpm, mostly at moderate throttle inputs, but have noticed it on gear changes when driving a bit more spiritedly. So very annoying! And also have that dull performance drop off from 3000 - 4500 rpm before the power comes back like crazy! Hesitation has been there from day one and very irritating, and certainly not something that I would have expected from a BMW!

Today I tested something out (did something that I have indirectly trained myself not to do), I mashed the throttle while in 4th at around 60 - 80 km/h and get that sudden hesitation. Try it again soon after and it's fine, but let the car settle and maybe try 5th gear and again, mash the throttle and there's that somewhat violent hesitation.

Engine also feels lumpy to me - off throttle and there is an overrun jerk, then gently feed power back on and there is a slight jerk, so not the refinement that I want at all. Bought some Liqui Moly injector cleaner which I am going to try out and see, but I somehow doubt that this is going to help, and I am really now getting to the end of my patience with this car!
07 328 e90
It's the characteristic of the car.....
At least that's what I've been told from the dealer.
I have the powerbox in as well and it does amplify the effects, I have to keep it on stock map for now so it's not as bad, but still is.
I have changed out the plugs, coils, MAF, air filter, had the fuel pump checked, fuel sending unit checked, fuel injectors checked, and then some, I had been leaning towards the gas pedal position sensor, maybe something to do with the stability control sensors, or just a bad throttle body.
I'm tired of dumping money and time into this car. If it weren't for my commute, I would go back to Dodge trucks.
At first I suspected a bad powerbox, it happens, but BMS responded back to me with such a shitty response saying to get a 335. Then asked if I installed it right. Hello, I'm not an idiot! Perhaps they are with their instructions, a couple of pin numbers to connect the wires to said it was one color but it wasn't the color in the car as they said it was. I connected it to the pin number. I then questioned myself if that was right, so it has to be something else, it's just a damn mystery.
Appreciate 0
      09-25-2012, 09:47 AM   #50
Phil325i
Brigadier General
Phil325i's Avatar
United Kingdom
612
Rep
3,184
Posts

Drives: E92 325i MSport Coupe
Join Date: Apr 2012
Location: UK South East

iTrader: (1)

Garage List
Have you tried throttle pedal re-learn procedure? Just a thought as you're clutching at straws...
__________________
E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
Appreciate 0
      10-06-2012, 07:40 PM   #51
Three_thirty_I
Lieutenant Colonel
Three_thirty_I's Avatar
South Africa
198
Rep
1,834
Posts

Drives: '05 E90 330i Manual
Join Date: Aug 2010
Location: Cape Town, South Africa

iTrader: (0)

Garage List
Quote:
Originally Posted by MrQuickR1 View Post
07 328 e90
It's the characteristic of the car.....
At least that's what I've been told from the dealer.
I have the powerbox in as well and it does amplify the effects, I have to keep it on stock map for now so it's not as bad, but still is.
I have changed out the plugs, coils, MAF, air filter, had the fuel pump checked, fuel sending unit checked, fuel injectors checked, and then some, I had been leaning towards the gas pedal position sensor, maybe something to do with the stability control sensors, or just a bad throttle body.
I'm tired of dumping money and time into this car. If it weren't for my commute, I would go back to Dodge trucks.
At first I suspected a bad powerbox, it happens, but BMS responded back to me with such a shitty response saying to get a 335. Then asked if I installed it right. Hello, I'm not an idiot! Perhaps they are with their instructions, a couple of pin numbers to connect the wires to said it was one color but it wasn't the color in the car as they said it was. I connected it to the pin number. I then questioned myself if that was right, so it has to be something else, it's just a damn mystery.
Just out of interest. I finally had my car checked with a tuner's diagnostics machine which apparently pics up quite a bit more information than the standard diagnostics machines at most agents, and they took the car for a drive while the diagnostics was being read, so basically a live read of what was all going on. This is what they found.

Engine is not pinking, the DISA flaps are fluttering and making constant corrections but incorrectly which is causing the pinking type noise and causing the engine to run less smoothly overall. Then more worryingly, the thermostat is not working properly and forcing the engine to run too cool, so there is some over-fuelling going on, especially on colder days. The Valvetronic motor is apparently 10% out of spec, not too sure what that means, but apparently can be sorted out with software, also not sure - ECU flash?! Cylinders 1 and 5 have some strange injector / valve behaviour, so either those injectors aren't working properly or the valves are not seating correctly - but this will need further investigation.

The first thing that needs to be done is to replace the two DISA flaps and the thermostat - then run tests again to see if this solves the problems.

At least now I know I am not imagining things!
__________________
BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03

Appreciate 0
      10-17-2012, 07:30 AM   #52
Three_thirty_I
Lieutenant Colonel
Three_thirty_I's Avatar
South Africa
198
Rep
1,834
Posts

Drives: '05 E90 330i Manual
Join Date: Aug 2010
Location: Cape Town, South Africa

iTrader: (0)

Garage List
Of course, agents wanted the car so that they can run diagnostics themselves and surprise surprise, they found no errors. So clearly I am just imagining this and the independent tuner is just guessing... Maybe time for me to move on!
__________________
BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03

Appreciate 0
      01-17-2015, 03:31 PM   #53
BlueforMonaco
Private
4
Rep
76
Posts

Drives: '11 128 msport
Join Date: Sep 2009
Location: Maryland

iTrader: (0)

I seem to be having same problem as OP e90ben. Have a slight bucking when the slightest amount of fuel is being fed to the engine(N52), no check engine light or codes.
Had the shop foreman at the dealer ride with me and he played dumb, saying all he felt were bumps in the road. Kind of surprised there hasn't seemed to be any resolution to this issue. I would love to provide an answer if/when it is resolved. Any assistance would be greatly appreciated!
Appreciate 0
      01-17-2015, 03:46 PM   #54
BlueforMonaco
Private
4
Rep
76
Posts

Drives: '11 128 msport
Join Date: Sep 2009
Location: Maryland

iTrader: (0)

just noticed OP corrected problem with a new pedal position sensor. Is this the same as a throttle position sensor? Has anyone been able to duplicate these results?
Appreciate 0
      01-21-2015, 12:49 PM   #55
e90ben
Lieutenant
e90ben's Avatar
Canada
27
Rep
552
Posts

Drives: No more Beemer
Join Date: Apr 2010
Location: Vancouver, BC

iTrader: (7)

Quote:
Originally Posted by BlueforMonaco View Post
just noticed OP corrected problem with a new pedal position sensor. Is this the same as a throttle position sensor? Has anyone been able to duplicate these results?
Its been a while since I did the fix, but if I recall, they are 2 different sensors


One at the throttle and one at the actual pedal
Appreciate 0
      06-20-2015, 08:02 PM   #56
pinoye90
Banned
Philippines
83
Rep
466
Posts

Drives: 07-E90
Join Date: Dec 2011
Location: PHX

iTrader: (0)

Quote:
Originally Posted by *********
I'm not sure what you mean by the 1/4 throttle increments but the mpg gauge in my 330 sometimes goes down to 12mpg then back to 50+mpg when feathering the throttle at low speeds....like when coming to and starting from a stop. Our cars have adaptive throttles which means they learn the way the drivers drive and will adjust settings appropriately. You can reset the "memory" by inserting your key fob into the slot and turning on the ACC power. 2 clicks, no foot on brake. Hold the accelerator pedal down for 25-30 seconds. You may or may not hear a noise coming from the vehicle. People say it is the transmission resetting itself but I think people just hear things coincidentally. The transmission is not a computer it is controlled by one. Turn the car back off. Take out and reinsert your key fob, start it up as normal and drive it around. See if this helps. GL.
is this the same thing as resering it on the BT TOOL.. THROTTLE RESET?
Appreciate 0
      01-29-2016, 05:57 AM   #57
gnd77
Registered
0
Rep
1
Posts

Drives: BMW 330iA E92
Join Date: Jan 2016
Location: Barnsley

iTrader: (0)

Hi all, some months on from the last post, can anyone confirm whether a new pedal position sensor fixes this problem on a long term basis please? 330i currently driving me mad! Thanks
Appreciate 0
Reply

Bookmarks

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 06:42 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