Dyno Issue :(

Rickzg · 09-07-2017, 09:21 AM

Hi guys, I put my 2012 m5 on the dyno today and the ecu kept pulling the boost, it did not log an error as much on the computer but when diagnosed came up with '120908 Charge pressure control. switch off; pressure build-up block.

The car is stock except a cat back akra and a new fitted RK intake (cover around 40 miles of mild driving)

Anyone have any clues what the problem might be??

Rickzg · 09-07-2017, 02:03 PM

Well just heard back from the garage they said the car is very much under powered. It was only making 460bhp (crank) at 6k rpm then going into limp mode. The problem is there are no errors being displayed.

They have suggested they start stripping the engine and start looking for any possible leaks.

Has anyone had this issue before?

M5_Brandoe · 09-07-2017, 02:41 PM

There are a lot of knowledgeable people here, someone will shoot some info. Good luck and keep us posted.

Rickzg · 09-07-2017, 02:45 PM

I hope so buddy!

apexlocator · 09-07-2017, 04:14 PM

Are the vacuum lines for your exhaust reinstalled correctly (dont know if Akra has the exhaust valves), or at least plugged up?

Rickzg · 09-07-2017, 11:34 PM

Quote:

Originally Posted by apexlocator

Are the vacuum lines for your exhaust reinstalled correctly (dont know if Akra has the exhaust valves), or at least plugged up?

Hi bud the akra has been on for a couple of years and the vacuum lines have been connected correctly

The car has covered 30k miles on the spark plugs not sure if they require changing??

M5_Brandoe · 09-08-2017, 05:33 AM

Quote:

Originally Posted by Rickzg

Quote:

Originally Posted by apexlocator

Are the vacuum lines for your exhaust reinstalled correctly (dont know if Akra has the exhaust valves), or at least plugged up?

Hi bud the akra has been on for a couple of years and the vacuum lines have been connected correctly

The car has covered 30k miles on the spark plugs not sure if they require changing??

Sparks plugs and coil pack will result in misfires.

Rickzg · 09-08-2017, 06:52 AM

Well I was just notified that the wastegates on both turbo's are not functioning properly, and the tuner also put the latest software on the car to no avail. Any ideas on what could be happening?

Rickzg · 09-08-2017, 11:37 AM

Just been notified there is hardly any vacuum at all, some pressure sensors have now been ordered

M5_Brandoe · 09-08-2017, 01:59 PM

Quote:

Originally Posted by Rickzg

Just been notified there is hardly any vacuum at all, some pressure sensors have now been ordered

Hopefully that is the issue. I'm not too familiar.

13M5F10 · 09-08-2017, 03:16 PM

Quote:

Originally Posted by Rickzg

Well I was just notified that the wastegates on both turbo's are not functioning properly, and the tuner also put the latest software on the car to no avail. Any ideas on what could be happening?

I would left the car up and check those vacuum lines for the stock exhaust and have then re plugged. Also check plugs

Rickzg · 09-08-2017, 03:46 PM

I will check the vacuum lines myself tomorrow and chase them as far back as possible, but the weird thing is that there is not even enough vacuum in the system to open the exhaust flaps. The plugs will also be done while everything is off

DaveCM5 · 09-17-2017, 06:16 PM

Does the car run normally on the street and only have the problem on the dyno?

epiphanyray · 09-18-2017, 10:02 AM

subscribed.

Rickzg · 09-28-2017, 01:57 PM

Hi guys, well I have the car back, seemed as though it needed the vacuum solenoids changed and i had leaky exhaust valves so these were plugged. The car seems to be all good now!

apexlocator · 09-28-2017, 04:27 PM

Glad to hear it wasnt a major issue...thanks for the followup.

M5_Brandoe · 09-28-2017, 08:04 PM

Glad you were able to pin point. Simple fix, but a headache. You were lucky lol

09-07-2017, 09:21 AM	#1
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	Dyno Issue :( Hi guys, I put my 2012 m5 on the dyno today and the ecu kept pulling the boost, it did not log an error as much on the computer but when diagnosed came up with '120908 Charge pressure control. switch off; pressure build-up block. The car is stock except a cat back akra and a new fitted RK intake (cover around 40 miles of mild driving) Anyone have any clues what the problem might be??
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09-07-2017, 02:03 PM	#2
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	Well just heard back from the garage they said the car is very much under powered. It was only making 460bhp (crank) at 6k rpm then going into limp mode. The problem is there are no errors being displayed. They have suggested they start stripping the engine and start looking for any possible leaks. Has anyone had this issue before?
	Appreciate 0 Quote

09-07-2017, 02:41 PM	#3
M5_Brandoe First Lieutenant 238 Rep 360 Posts Drives: Black sapphire M5 Join Date: May 2017 Location: New Jersey iTrader: (0)	There are a lot of knowledgeable people here, someone will shoot some info. Good luck and keep us posted. __________________ Instagram MRBrandoe
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09-07-2017, 02:45 PM	#4
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	I hope so buddy!
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09-07-2017, 04:14 PM	#5
apexlocator Captain 243 Rep 881 Posts Drives: 2014 M5 Join Date: Feb 2016 Location: socal iTrader: (1)	Are the vacuum lines for your exhaust reinstalled correctly (dont know if Akra has the exhaust valves), or at least plugged up? __________________ 2014 "AW/SO"me M5 Mission Performance/3.5 Bar RK Autowerks/ CSF ICs SSP Spec-R KW V3/ Corsa Axle back
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09-08-2017, 06:52 AM	#8
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	Well I was just notified that the wastegates on both turbo's are not functioning properly, and the tuner also put the latest software on the car to no avail. Any ideas on what could be happening?
	Appreciate 0 Quote

09-08-2017, 11:37 AM	#9
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	Just been notified there is hardly any vacuum at all, some pressure sensors have now been ordered
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09-08-2017, 03:46 PM	#12
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	I will check the vacuum lines myself tomorrow and chase them as far back as possible, but the weird thing is that there is not even enough vacuum in the system to open the exhaust flaps. The plugs will also be done while everything is off
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09-17-2017, 06:16 PM	#13
DaveCM5 Second Lieutenant 85 Rep 252 Posts Drives: 2014 M5 Sapphire Black Join Date: Jun 2005 Location: Florida iTrader: (0)	Does the car run normally on the street and only have the problem on the dyno?
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09-18-2017, 10:02 AM	#14
epiphanyray First Lieutenant 122 Rep 352 Posts Drives: 2003 E39 M5 + 2013 F10 M5 Join Date: Mar 2017 Location: Santo Domingo, Dominican Republic iTrader: (1)	subscribed.
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09-28-2017, 01:57 PM	#15
Rickzg Private 11 Rep 74 Posts Drives: audi r8 Join Date: Jun 2017 Location: London iTrader: (0)	Hi guys, well I have the car back, seemed as though it needed the vacuum solenoids changed and i had leaky exhaust valves so these were plugged. The car seems to be all good now!
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09-28-2017, 04:27 PM	#16
apexlocator Captain 243 Rep 881 Posts Drives: 2014 M5 Join Date: Feb 2016 Location: socal iTrader: (1)	Glad to hear it wasnt a major issue...thanks for the followup.
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09-28-2017, 08:04 PM	#17
M5_Brandoe First Lieutenant 238 Rep 360 Posts Drives: Black sapphire M5 Join Date: May 2017 Location: New Jersey iTrader: (0)	Glad you were able to pin point. Simple fix, but a headache. You were lucky lol __________________ Instagram MRBrandoe
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