Boost Pressure Lower Than Expected Code

03Saleen · 08-08-2017, 12:44 PM

So I was doing a pull against my buddies GT-500 going from 3rd to 4th Gear (6-Speed Manual, JB4 Map 2 all wires connected) second I shift to 4th gear, loss of power then I got a drive train malfunction. First thought is I cracked a charge pipe, when I got back checked all the pipes and they seem fine no cracks. Turn the car off let it sit for 20 minutes, start it back up and the code is gone and the car seems to be running fine. Could this be a problem with the turbo's waste gates or just a fluke, should I be concerned?

120308 Boost Pressure Lower Than Expected

03Saleen · 08-09-2017, 08:46 PM

Anyone?

BoxKing · 08-09-2017, 11:48 PM

Is this the first pull on the JB4?
If so, pull the negative on the battery and let everything relearn. I know the JB4 had your back, but give it time - and you will love it.

TurboM · 08-10-2017, 11:05 AM

Quote:

Originally Posted by 03Saleen

So I was doing a pull against my buddies GT-500 going from 3rd to 4th Gear (6-Speed Manual, JB4 Map 2 all wires connected) second I shift to 4th gear, loss of power then I got a drive train malfunction. First thought is I cracked a charge pipe, when I got back checked all the pipes and they seem fine no cracks. Turn the car off let it sit for 20 minutes, start it back up and the code is gone and the car seems to be running fine. Could this be a problem with the turbo's waste gates or just a fluke, should I be concerned?

120308 Boost Pressure Lower Than Expected

I'd "guess" something with the JB4 since it is manipulating the voltage of a few sensors (MAP being one of them). If the values and deltas between the voltage of the MAP and other sensors (such as mass air) are not where they should be you'll get an error like as this.

Probably not the issue but try unplugging the EWG connectors since they're not needed for MAP 2 anyway.

Mike@N54Tuning.com · 08-10-2017, 12:00 PM

Do a datalog and evaluate if your boost is really below target. If it is then continue looking for physical boost leaks, etc.

Mike

03Saleen · 08-10-2017, 09:39 PM

Thanks for the input guys! No not first pull.

mike@x-ph.com · 08-14-2017, 06:32 PM

+1 for datalog

meadowsdb · 03-27-2023, 10:32 AM

Was this ever resolved? Just had a similar situation on my M8 Comp.

08-08-2017, 12:44 PM	#1
03Saleen First Lieutenant 146 Rep 334 Posts Drives: 2015 BMW M4 Join Date: Mar 2014 Location: Richmond, VA iTrader: (0)	Boost Pressure Lower Than Expected Code So I was doing a pull against my buddies GT-500 going from 3rd to 4th Gear (6-Speed Manual, JB4 Map 2 all wires connected) second I shift to 4th gear, loss of power then I got a drive train malfunction. First thought is I cracked a charge pipe, when I got back checked all the pipes and they seem fine no cracks. Turn the car off let it sit for 20 minutes, start it back up and the code is gone and the car seems to be running fine. Could this be a problem with the turbo's waste gates or just a fluke, should I be concerned? 120308 Boost Pressure Lower Than Expected
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08-09-2017, 08:46 PM	#2
03Saleen First Lieutenant 146 Rep 334 Posts Drives: 2015 BMW M4 Join Date: Mar 2014 Location: Richmond, VA iTrader: (0)	Anyone?
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08-09-2017, 11:48 PM	#3
BoxKing I Rock Your Girls Box 293 Rep 662 Posts Drives: M4 F82 ZCP AW Join Date: Nov 2016 Location: Philadelphia iTrader: (1)	Is this the first pull on the JB4? If so, pull the negative on the battery and let everything relearn. I know the JB4 had your back, but give it time - and you will love it.
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08-10-2017, 12:00 PM	#5
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	Do a datalog and evaluate if your boost is really below target. If it is then continue looking for physical boost leaks, etc. Mike
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08-10-2017, 09:39 PM	#6
03Saleen First Lieutenant 146 Rep 334 Posts Drives: 2015 BMW M4 Join Date: Mar 2014 Location: Richmond, VA iTrader: (0)	Thanks for the input guys! No not first pull.
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08-14-2017, 06:32 PM	#7
mike@x-ph.com BimmerPost Supporting Vendor 24201 Rep 190,807 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	+1 for datalog __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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03-27-2023, 10:32 AM	#8
meadowsdb Private 68 Rep 92 Posts Drives: '20 M8 Comp Grand Coupe Join Date: Mar 2019 Location: Los Angeles, CA iTrader: (0)	Was this ever resolved? Just had a similar situation on my M8 Comp. __________________ Rides-- '17 M3 CP-CAI, Dinan Stg 1 '17 Camaro ZL1 (700HP) '15 Audi S4 (500 HP) '15 Charger Hellcat (1050 HP)
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