03-28-2015, 10:16 PM | #1 |
Enlisted Member
27
Rep 45
Posts |
Intermittent turbo failure? - HELP
I posted about this earlier with no luck, so I'm going to try again. I love my M3 and just trying learn more about how modern turbos work.
- Time to time, the car feels like the turbos aren't working properly. It's not a limp mode slow, but struggling to freely rev. - Car sounds and feels a little rough, and the throttle is noticeable stiffer. - Feels as if the turbos are clogged up. What drives me nuts is it will correct itself after few days and drives like a dream for a week or so until it happens again. - It seems to be related to icy/snowy weather. It was freezing cold + snowing today to the degree that a sheet of ice formed a layer on the front bumper. I've done some web searches and came up with faulty MAF sensors, and vanes clogging. Again, the symptoms come and go. Please help me understand what might be going on! My car has 4200 miles on it, DCT. |
03-29-2015, 09:46 AM | #3 |
Enlisted Member
27
Rep 45
Posts |
|
Appreciate
0
|
03-29-2015, 09:51 AM | #4 |
General
62737
Rep 24,509
Posts |
What is your BMW/Dealer saying about this problem ?
__________________
"MAX VERSTAPPEN" IS THE 2021+2022+2023 F1 WORLD CHAMPION - #UnLeashTheLion
BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod. |
Appreciate
1
|
03-29-2015, 10:00 AM | #5 |
Lieutenant
234
Rep 512
Posts |
yeah sounds ecu related for sure. i'd turn off traction control next time it happens and see if it clears up. it may be cutting power from the ecu for some error. but if its a fuel pump it would probably run the same with traction turned off still. so thats what i'd try. but really you need to take in to the dealer.
|
Appreciate
0
|
03-29-2015, 10:02 AM | #6 |
Lieutenant
234
Rep 512
Posts |
you can also check intercooler piping and make sure a hose clamp is not loose.
|
Appreciate
1
|
03-29-2015, 01:33 PM | #7 |
Enlisted Member
27
Rep 45
Posts |
Quick update:
I drove it around today, still felt similar- stiff throttle, reduced performance up top. I parked it, enjoyed the warm weather outside for awhile, opened the hood to check the clamps and hoses, started the car and what do you know, the car is BACK TO NORMAL. Revs freely, and pulls like freight train. It's considerable warmer and sunny today and I'm even more convinced that it's temp/humidity related and it's some sort of ECU/sensor issue. I'm still going to take it to the dealer to have it looked. |
Appreciate
1
|
03-29-2015, 02:06 PM | #8 | |
Lieutenant General
1307
Rep 10,185
Posts |
Quote:
The throttle is electronic, no mechanical linkage to the engine. Maybe you have some sand or a small pebble or something else caught behind the pedal ? A good vacuum may help
__________________
BMW if you are reading, I need a job, Please. |
|
Appreciate
0
|
04-03-2015, 08:20 AM | #11 |
Second Lieutenant
116
Rep 240
Posts |
I believe it's related to the outside temperature. I picked up my car in February (upstate NY), and yesterday was the first 60+ degree day that I drove my car in. The difference was night and day. On cold days, I was struggling to get the torque up to even 300 in lower gears with 75% throttle, but it was bouncing around in the 360 with the same amount of throttle yesterday. Massive difference!
|
Appreciate
0
|
04-03-2015, 08:35 AM | #12 |
Lieutenant Colonel
1111
Rep 1,904
Posts |
If the throttle feels stiff, I would start there. After all its your first entry into the system - at your foot...
I believe the M3/M4 are drive by wire wrt the throttle mechanism. This would likely require some sort of electrical component to read the position of your throttle (ie. some sort of linear or rotating potentiometer). If you are REALLY feeling stiffness in the throttle then you may have a problem with that component. Its statistically unlikely it would be more than one thing failing at a time (ECU, Turbo, Intercooler, etc). So you should carefully ask yourself if you are REALLY feeling a stiff throttle. If so, start there... Maybe there could be some freezing moisture in the linkage/pot which is connected to your pedal... Maybe the mechanical linkage is slipping or jamming... Start your diagnosis at the control point if you feel a difference... |
Appreciate
0
|
04-03-2015, 01:19 PM | #13 |
Brigadier General
1881
Rep 3,341
Posts |
Are you being consistent with your pulls? car makes the most pulling in a sweet upper band of the rpms.
I have seen inconsistency if I let the car on a lower rpm suddenly and then shift to a lower gear quickly.
__________________
Currently:
2018 GT3 2020 X3MC Previously: 1999 M3 2002 M3 2005 S4 2008 C63 2015 M3 2016 X5M 2019 911S |
Appreciate
0
|
04-03-2015, 04:24 PM | #14 | |
Major General
6356
Rep 6,564
Posts |
Quote:
The throttle pedal is completely electronic. There is one connection and one bolt, and you can pull it right out of the car. If the throttle is stiff, and it's not your imagination, then I would look at the pedal assembly. |
|
Appreciate
0
|
04-03-2015, 04:27 PM | #15 |
Second Lieutenant
62
Rep 217
Posts |
I can't believe some of these clueless responses about a pedal.. there is no linkage!
Take it to the dealer for gods sake.. you have a warranty for a reason |
Appreciate
1
|
04-03-2015, 04:52 PM | #16 | |
Major General
6356
Rep 6,564
Posts |
Quote:
|
|
Appreciate
0
|
04-04-2015, 11:19 AM | #17 |
New Member
13
Rep 23
Posts |
It happened to me as well.
I inadvertently pressed the "LIM" button on the steering wheel at around 20 miles per hour. Car would not go over that speed |
Appreciate
0
|
04-06-2015, 10:27 AM | #18 | |
Lieutenant Colonel
1111
Rep 1,904
Posts |
Quote:
Get over it! |
|
Appreciate
0
|
04-08-2015, 07:36 PM | #19 |
Enlisted Member
27
Rep 45
Posts |
Update:
So I've been out of the country for last couple days. Drove it today and it felt like the car was sick. It's as if the car does not want to perform. The engine sound was off. It's like things are out of sync. After dinner, I went back to my car, OPENED the hood to check things then CLOSED it, then started the car. Whoa, the M3 was back. It revved smoothly and freely, it sounded awesome and the power was back. I parked it and then started it again. Guess what, the car drove like crap again. It's like 2 different cars. Opening the hood has a resetting effect it seems, but only temporarily. Anyways, I scheduled a service this Saturday. I really hope this is something minor. |
Appreciate
1
|
04-21-2016, 06:20 AM | #20 |
Registered
0
Rep 3
Posts |
Hi BK9731,
Very interested in your story because I have an F80 M3 in the UK, and I'm having EXACTLY the same issues. Car feeling as though it's down on power and running rough - and then running fine at other times. BMW dealer doesn't seem able to shine any light on the issue and there are no faults found by the diagnostics systems. Have you managed to get anywhere with yours? Thanks, Richard. |
Appreciate
0
|
04-21-2016, 06:46 AM | #21 | |
Brigadier General
1593
Rep 3,945
Posts
Drives: 2015 M4 MG/SO
Join Date: Mar 2014
Location: MTL, QC
|
Quote:
Back to the OP, since you are curious, do get the software and the coding cable and look for yourself. It may help you point in the right direction but not necessarily identify the root cause. You can post screenshots here, and I am sure people can chime in with more comments if the dealer can't figure it out. |
|
Appreciate
0
|
04-21-2016, 06:48 AM | #22 | |
Private First Class
45
Rep 131
Posts |
Quote:
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|