Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #21  
Old 12-24-2015, 11:36 AM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
Pulled all connectors to the DME and reset. No sign of oil, water, or coolant intrusion on the pins. Will be taking a long trip this afternoon and will log and see if resetting the pins has had any effect. After resetting the pins, the truck started and ran fine.

Thanks for the support guys! Happy Holidays!
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive
Reply With Quote

Sponsored Links

  #22  
Old 12-27-2015, 07:17 PM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
More data in the dropbox file below... no limp mode (fuel status "8") encountered, but still throwing misfire codes on all cylinders, no other codes.

https://dl.dropboxusercontent.com/u/...5%20PM%29.xlsx

One thing I keep noticing, but don't know if it is normal or not is the wide voltage gap at times between the #1 O2 sensor on bank and #1 O2 sensor on bank 2. At times one bank is way lean and the other is way rich. The second O2 sensors seems to be very consistent...

Also - I assume the data "drops" ("0" values) or lack of change in value over several seconds is simply the logger trying to record data faster than the ECU can provide it.

Thanks in advance for any data analysis here!
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive
Reply With Quote
  #23  
Old 12-28-2015, 09:50 AM
Member
 
Join Date: Dec 2010
Location: Fairfax, VA
Posts: 758
jfoj is on a distinguished road
Rookie,

The most recent Log that you posted looks pretty good overall.

Do not be worried about the differences you are seeing in the Pre-Cat O2 sensors. This is likely due to the polling sequence and the slower response of the cheaper/slower interface.

Also the O2 sensors dropping to 0 Volts is typically during Decel with Fuel Cut Off, notice the Fuel System Status is at 4 during these time windows.

The only thing I am really seeing that may be something to watch for is the engine coolant temperature may be slightly lower than expected. Typically the M54 should run pretty consistently at 96C except under heavy load or higher RPM when the thermostat heater is commanded on.

But without knowing more details on how long the engine had been running, what the ambient temps were and if it was raining hard at the time it is a bit tricky to know if the thermostat is slightly soft. I also do not expect the engine temperature concern to factor into the overall problem you were having.

I still need to look over the 3 earlier Logs you posted a bit closer, still trying to catch up after the holidays.
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.
Reply With Quote
  #24  
Old 12-28-2015, 10:38 AM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
JFOJ:

Thanks for the quick glance at the logs. These were taken at highway speeds, after the truck had been running at least 1.5 hours on the highway, no rain, ambient temp was between 8 C and 9 C.

I have another log to post from this mornings drive into work - entered limp mode (at 9:00 - fuel status goes to "8", no SES light, restarted truck on the fly) and the SES light came on at 9:05.

https://dl.dropboxusercontent.com/u/...5%20AM%29.xlsx

I color-coded the timeslice where the limp mode happened...
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive

Last edited by Rookie48; 12-28-2015 at 10:52 AM.
Reply With Quote
  #25  
Old 12-29-2015, 11:26 AM
Member
 
Join Date: Dec 2010
Location: Fairfax, VA
Posts: 758
jfoj is on a distinguished road
Rookie,

I am somewhat at a loss for the moment, nothing really standing out. There is an obvious Lean condition, but what came first the chicken or the egg??

So is the Lean condition a true Lean condition or is this due to Misfire with Fuel Cut off and is one or more cylinders pumping a lot of air/oxygen into the exhaust stream??

Shooting from the hip here, what is the status of the fuel pump relay? If it is original, I would replace it. Not 100% if the E53 horn and fuel pump relay are the same, if they are, swap them and see what happens.

I am tied up the rest of the day, will think about this and look over again in the next few days.
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.
Reply With Quote
  #26  
Old 12-29-2015, 04:30 PM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
JFOJ:

Swapped the relays a week or so ago, actually replaced the fuel pump relay with a brand new relay today. No change.

Also replaced the idle control valve, no change.

Removed and bench-tested the secondary air valve, it is working properly and had little to no carbon build-up.

Connected a fuel pressure gauge, secured it to the windshield, took it out for a test drive. Pressure never bobbled or moved off of 45 psi.

Drove home from the shop and again it threw misfire codes (all cylinders) and entered limp mode twice on the highway (above 75 MPH), and unusually it didi it in first gear going down a short hill into my driveway.

at my wits end on this one.
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive
Reply With Quote
  #27  
Old 12-29-2015, 05:09 PM
upallnight's Avatar
Member
 
Join Date: Aug 2012
Location: Cook County
Posts: 7,280
upallnight is on a distinguished road
Have you ever done a compression test on all the cylinders? A miss to the DME is a cylinder that is not producing as much power as the other cylinders. Also when you replaced the MAF was it with a siemens or some cheap piece of crap?
__________________
2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
Reply With Quote
  #28  
Old 12-29-2015, 05:49 PM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
Yes - performed a compression test two months ago (when issue started). All cylinders were within 5% of each other (~160 psi I believe was the norm). I replaced the MAF with a used OEM unit out of another E53 3.0i that was known to have no issue. I did not replace it with a brand new unit in trying to figure this issue out.

Just FYI - this truck is throwing misfire codes (P0300 through P0306) for all cylinders at the same time. No other codes are thrown.
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive
Reply With Quote
  #29  
Old 12-30-2015, 01:38 PM
Member
 
Join Date: Dec 2010
Location: Fairfax, VA
Posts: 758
jfoj is on a distinguished road
Rookie,

You have the M54 I6 engine as I recall.

I believe the fuel pressure should be Fuel pressure 3.5 +/- 0.2 bar or 50.76 +/- 2.9 PSI? Although 45 PSI is not far off, I would be double checking this along with your gauge.

How steep is the hill you are dealing with at the house?

I will need to read back over everything again in more detail as I have many vehicles in my head that I am dealing with.

Fuel pump was replaced? If so, what brand & where purchased?

I think the Fuel System Status changing to 8 here is the key, but the question is why. This usually occurs when the O2 sensor output does not toggle back and forth and follow the engine fuel management changes. I am starting to think there is possibly some Lean/fuel starvation problem here??

I understand you say the fuel pressure gauge did not move, but often the gauges do not connect properly. Did you see a quick drop in pressure when you shut the vehicle off?

Post any Freeze Frame data you get from both the driveway and cruising if you can get it.
__________________
2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.
Reply With Quote
  #30  
Old 12-30-2015, 02:10 PM
Rookie48's Avatar
Member
 
Join Date: Mar 2015
Location: NJ
Posts: 71
Rookie48 is on a distinguished road
JFOJ:

Answers below... thanks!

Fuel pressure gauge was taped to the middle of the windshield (just under the rearview mirror), so my reading of it while driving may be slightly off. The fuel pressure gauge only moved on initial startup (truck had been off for at least an hour, lost some pressure attaching the gauge), It did not move move than 1-2 psi for the entire test drive, and when I shut off the truck, it remained at the 45 psi until the gauge was removed (about 10 minutes).

Hill at house has an initial slope of about 30%, was in 1st gear coasting, but applied a little throttle when misfire started. The hill is only 50 ft long before it levels out. I read somewhere that the DSC-X system can manage the "limp mode" but there was no actual wheel slippage (unless a bad sensor is creating a phantom issue here???).

Fuel pump was replaced by my local indie shop, I do not know the brand or where purchased (Hey Mark - if you are following this thread, feel free to jump in here! ). The fuel pump was replaced after these misfire issues started as a possible cause. Fuel filter, regulator, and relay are all new. Pressure testing suggests the engine is getting fuel properly without any starvation issue.

I will continue to gather logs....

Thanks again!
__________________
2006 X5 3.0i 6MT
2004 ///M3 Coupe 6MT
1997 ///M3 Coupe 5MT
2015 X3 2.8i xDrive
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 02:26 AM.
vBulletin, Copyright 2024, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
© 2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.