Boost Pressure Ramdonly goes Away and Then Returns
#26
02-18-2011 | 07:01 AM
If your o2 was reading out of spec youll get a cel. I think your just noticing the default engine temp limiter.
How does it run with the jcw tune? jcws have 1 pt less of compression and flow more air. How smooth does it run/ have you logged afr numbers?
Does that include the semi closed system Diverter valve action?
Over run feature?
Not doubting or attacking you just asking.
How does it run with the jcw tune? jcws have 1 pt less of compression and flow more air. How smooth does it run/ have you logged afr numbers?
Does that include the semi closed system Diverter valve action?
Over run feature?
Not doubting or attacking you just asking.
This morning the MINI was flawless. Ambient temperature was 34 degrees going to work. Once the MINI was warmed up I had full boost available. Driving home tonight it was 51 degrees outside and everything worked perfectly.
Typically my MINI is at about 175 degrees water temp when I get to I95. Up until this past December I've had no issues what so ever with loosing boost.
Has anyone documented when you start to see deflection in the AFR numbers after a cold start on the MINI?
I agree with ThumperMCS on allowing your MINI to warm up. After starting my MINI I let it run for at least a minute before moving it. I also keep it under 2,000 RPM until water temperature is at least 130 degrees. Then keep it under 3,000 RPM until water temp is above 150 degrees.
Again I suspect either a O2, MAF or MAP sensor beginning to fail. The dealer has not been able to diagnose the problem.
Typically my MINI is at about 175 degrees water temp when I get to I95. Up until this past December I've had no issues what so ever with loosing boost.
Has anyone documented when you start to see deflection in the AFR numbers after a cold start on the MINI?
I agree with ThumperMCS on allowing your MINI to warm up. After starting my MINI I let it run for at least a minute before moving it. I also keep it under 2,000 RPM until water temperature is at least 130 degrees. Then keep it under 3,000 RPM until water temp is above 150 degrees.
Again I suspect either a O2, MAF or MAP sensor beginning to fail. The dealer has not been able to diagnose the problem.
#27
02-18-2011 | 06:47 PM
If your o2 was reading out of spec youll get a cel. I think your just noticing the default engine temp limiter.
How does it run with the jcw tune? jcws have 1 pt less of compression and flow more air. How smooth does it run/ have you logged afr numbers?
Does that include the semi closed system Diverter valve action?
Over run feature?
Not doubting or attacking you just asking.
How does it run with the jcw tune? jcws have 1 pt less of compression and flow more air. How smooth does it run/ have you logged afr numbers?
Does that include the semi closed system Diverter valve action?
Over run feature?
Not doubting or attacking you just asking.
Got it. I lit off the OBDCOM data logging software today on an old laptop that appeared in the mail yeaterday that would not boot. I fixed the laptop and here are the results from the drive home.
http://cid-8eff10c2de199437.office.l...ylockR561.xlsx
One thing I noticed immediately after I hooked everything up is that I was getting no data from O2 Sensor Bank 1 Sensor 1
I was getting data from O2 Sensor Bank 1 Sensor 2
Is the Bank 1 Sensor 1 O2 sensor the pret CAT O2 sensor?
Shouldn't it be reading something. It just stayed at 0.0.
Last edited by scottab36; 02-18-2011 at 07:13 PM.
#28
02-18-2011 | 08:00 PM
Got it. I lit off the OBDCOM data logging software today on an old laptop that appeared in the mail yeaterday that would not boot. I fixed the laptop and here are the results from the drive home.
http://cid-8eff10c2de199437.office.l...ylockR561.xlsx
One thing I noticed immediately after I hooked everything up is that I was getting no data from O2 Sensor Bank 1 Sensor 1
I was getting data from O2 Sensor Bank 1 Sensor 2
Is the Bank 1 Sensor 1 O2 sensor the pret CAT O2 sensor?
Shouldn't it be reading something. It just stayed at 0.0.
http://cid-8eff10c2de199437.office.l...ylockR561.xlsx
One thing I noticed immediately after I hooked everything up is that I was getting no data from O2 Sensor Bank 1 Sensor 1
I was getting data from O2 Sensor Bank 1 Sensor 2
Is the Bank 1 Sensor 1 O2 sensor the pret CAT O2 sensor?
Shouldn't it be reading something. It just stayed at 0.0.
On my accessport I get a reading on sensor 1 and sensor 2...just went and checked, both were at 1.5 Volts....so maybe that is your problem?
#29
02-19-2011 | 04:44 AM
I suspect so. I'm not even seeing 1 volt on O2 Bank 1 Sensor 2. Her is the data logging from this morning.
http://cid-8eff10c2de199437.office.l...aylockR562.xls
I have a buddy coming down with his 2010 MINI. I'm gonna hook my laptop up to his MINI and verify the readings.
#30
02-19-2011 | 06:27 PM
#31
02-20-2011 | 07:04 AM
I lost boost again this morning and was able to data log the entire event. The ambient temperature was 17(F) degrees.
R56 S Data Logging Boost Loss Event.xls Updated file that shows boost and vacuum.
Boost loss occured right before I arrived at work (RED Cells). I drove past work and continued driving. Boost returned about 15 minutes later (Green Cells).
Before shutting everything down I checked codes and there was a pending P2188 code (fuel system too rich at idle).
If anyone can glean any information from this data logging that explains what happened, please let me know.
Here the list of all modifications to my MINI: Louise Modification List Final Short.pdf (Currently running the factory JCW tune)
R56 S Data Logging Boost Loss Event.xls Updated file that shows boost and vacuum.
Boost loss occured right before I arrived at work (RED Cells). I drove past work and continued driving. Boost returned about 15 minutes later (Green Cells).
Before shutting everything down I checked codes and there was a pending P2188 code (fuel system too rich at idle).
If anyone can glean any information from this data logging that explains what happened, please let me know.
Here the list of all modifications to my MINI: Louise Modification List Final Short.pdf (Currently running the factory JCW tune)
Last edited by scottab36; 02-21-2011 at 07:29 AM.
#32
02-22-2011 | 06:11 PM
I replaced the pre-CAT O2 sensor and cleaned the MAF today The data logging numbers changed a bit showing that the MINI is not running so lean. The after CAT O2 sensor arrives tomorrow and I will try to install it after work tomorrow.
BTW, shop around for these. The dealer price is $268 each. I found the Bosch pre CAT O2 Sensor for $128 and the after CAT Bosch O2 sensor for $133.
BTW, shop around for these. The dealer price is $268 each. I found the Bosch pre CAT O2 Sensor for $128 and the after CAT Bosch O2 sensor for $133.
#33
02-23-2011 | 03:08 AM
No issues going to work today at 21F degrees. Very smooth power and NO loss of boost where it's normally been occurring. I suspect the dirty MAF was the issue although it doesn't hurt to put in the new O2 sensors.
BTW I highly recommend the OBDCOM data logging software. It's a very complete package for under a hundred clams!!
http://www.obdcom.com
BTW I highly recommend the OBDCOM data logging software. It's a very complete package for under a hundred clams!!
http://www.obdcom.com
#34
02-23-2011 | 04:11 PM
The MINI adventure continues... All is well so far with the clean MAF sensor and two new O2 sensors. Power is restored and saw 16.6 PSIg coming home today. This is on the JCW tune with an ambient temperature of 45F degrees.
Looking at about 16F degrees for the ride to work in the morning. If boost loss does not occur I'm calling this mystery solved.
Looking at about 16F degrees for the ride to work in the morning. If boost loss does not occur I'm calling this mystery solved.
#35
02-23-2011 | 06:46 PM
6th Gear
Joined: Jan 2006
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The MINI adventure continues... All is well so far with the clean MAF sensor and two new O2 sensors. Power is restored and saw 16.6 PSIg coming home today. This is on the JCW tune with an ambient temperature of 45F degrees.
Looking at about 16F degrees for the ride to work in the morning. If boost loss does not occur I'm calling this mystery solved.
Looking at about 16F degrees for the ride to work in the morning. If boost loss does not occur I'm calling this mystery solved.
#36
02-24-2011 | 03:43 AM
Looks like I can close out this issue. Another flawless run into work this morning. No loss of boost and everything feels super smooth through the power band.
Here is the data logging for those who care. MINIR56DataLogging.xls
This is a 2007 MCS running the factory JCW tune.
Here is the data logging for those who care. MINIR56DataLogging.xls
This is a 2007 MCS running the factory JCW tune.
#39
03-06-2011 | 04:53 PM
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