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
  #1  
Old 05-05-2019, 12:37 PM
Member
 
Join Date: Aug 2018
Location: Central FL
Posts: 102
Mike1261 is on a distinguished road
Hard Start/Rough Idle only in Florida Climate

My 06 E53/M54 has an odd problem.

When home in FL climate it struggles to start from cold, and once started I need to bring the RPM up a little for just a second and then the idle stabilizes.

Just did a road trip to Ontario for 2 weeks and the car had zero issues the entire trip. Started right up every. Single. Time.

We get down to around Georgia and now it's back to hard starts and poor idle. Every. Single. Time. (When cold. Once engine is hot it's good again)

New plugs. New CCV. New thermostat. New O2 sensors. New Intake Side Cam Position Sensor.

I'm wondering if the MAF could cause this? Or if there's something else I should look at?

It burns about a Qt of oil every 900 miles (now that the oil leak from the oil filter housing gasket has been fixed!) so initially I was wondering if it was just CCV leaving oil in the intake that needed to burn off before idling smoothly. But new CCV and no issues in cooler dryer climates for weeks. So thinking it's not an oil issue.

If the plugs weren't new and the problem didn't exist prior to changing the plugs I'd suspect those. But the problem has existed since owning the car. This trip up north just gave me more feedback to diagnose with in terms of climate and humidity.

It also continues to have an issue where it stalls (infrequently) at low rpm around corners. This issue also did not exist in the cooler climate.
Reply With Quote

Sponsored Links

  #2  
Old 05-05-2019, 07:20 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 10,817
andrewwynn will become famous soon enough
Does e53 have IAC? I'm thinking it's an altitude thing and at higher altitude the mix is calculated better at start.

What scan tool are you using?

Mine will show me atmosphere pressure, MAP, throttle position sensor and (both). I also bumped my idle speed up 25-50 Rpm.
__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)
Reply With Quote
  #3  
Old 05-05-2019, 07:56 PM
bcredliner's Avatar
Premier Member
 
Join Date: Jun 2008
Location: Little Elm,Texas. (40 minutes North of Dallas)
Posts: 8,105
bcredliner is on a distinguished road
A cold engine starts in open loop. In open loop the ECM controls the air/fuel mixture reading input from sensors. Might be a bad MAF, coolant sensor or thermostat. Try cleaning the MAF with MAF cleaner. Spray liberally. Be sure to spray the wires that are kind of hidden. Doesn't always work but worth a try.
__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
Reply With Quote
  #4  
Old 05-05-2019, 08:03 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 10,817
andrewwynn will become famous soon enough
Quote:
Originally Posted by bcredliner View Post
A cold engine starts in open loop. In open loop the ECM controls the air/fuel mixture reading input from sensors. Might be a bad MAF, coolant sensor or thermostat. Try cleaning the MAF with MAF cleaner. Spray liberally. Be sure to spray the wires that are kind of hidden. Doesn't always work but worth a try.


Good points. Read all the temp sensors and MAF realtime values. A week or two ago a few of us posted the MAF rate at idle for reference. Search MAF and g/sec I don't remember what thread.


Sent from my iPhone using Tapatalk Pro
__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)
Reply With Quote
  #5  
Old 05-05-2019, 08:24 PM
wpoll's Avatar
Member
 
Join Date: Sep 2015
Location: South Island, New Zealand
Posts: 4,659
wpoll will become famous soon enough
Quote:
Originally Posted by bcredliner View Post
A cold engine starts in open loop. In open loop the ECM controls the air/fuel mixture reading input from sensors. Might be a bad MAF, coolant sensor or thermostat. Try cleaning the MAF with MAF cleaner. Spray liberally. Be sure to spray the wires that are kind of hidden. Doesn't always work but worth a try.
Don't you mean open loop controls the mixture from a look-up table and NOT from sensors...? Once the sensors are in play, the loop is closed....
__________________
Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)
Reply With Quote
  #6  
Old 05-08-2019, 02:27 PM
bcredliner's Avatar
Premier Member
 
Join Date: Jun 2008
Location: Little Elm,Texas. (40 minutes North of Dallas)
Posts: 8,105
bcredliner is on a distinguished road
Quote:
Originally Posted by wpoll View Post
Don't you mean open loop controls the mixture from a look-up table and NOT from sensors...? Once the sensors are in play, the loop is closed....
ECM does use stored maps but also uses sensors such as temp sensor etc. When in open loop the 02 sensors are not in the equation.
__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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 02:19 PM.
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.