Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
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 01-17-2019, 09:31 PM
Member
 
Join Date: Feb 2013
Location: nyc
Posts: 1,860
jsoto is on a distinguished road
How Long for a Coil Failure to trigger a SES

Multitude of issues just sorta cropped at the same time leading to different diags on different fronts pre/post repair

In no special order. battery had a short. Bench tested clean but for sure, after replacing battery, the V issues I was seeing disappeared.
New reman trans. Initial diag seemed to be V issues but upon further test drive, it was def. the tran.
Fast forward to post reman trans. Got a heavy shudder and initial thought was bad TQC on it. More driving, pointed to misfires. Nothing on the cluster, but after some test driving, saw the SES blip about a couple times. Couple post test drives and nary a blip on the cluster though.

Car was driving like a wet dog. Got it read with real scan tools, confirmed bad coil. Anyhow, new coils and plugs in, and power is back where it should be.

How many misfires is required before the SES lights comes on. Ha, I was saying if she still drives like a wet dog, going to need to add a smoke evap tool to the stash of tools
Reply With Quote

Sponsored Links

  #2  
Old 01-18-2019, 12:05 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 10,818
andrewwynn will become famous soon enough
There is a secret formula for # misfires in a minute or such to trip a code and kick on limp home mode.

Usually you can reset the code and immediately disable limp home mode
__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)
Reply With Quote
  #3  
Old 01-18-2019, 08:47 AM
Member
 
Join Date: Feb 2013
Location: nyc
Posts: 1,860
jsoto is on a distinguished road
Can't wait to get my pasoft working. The X is not my daily so its subtle issues that don't generate lights trickle down slowly to my Wiki. As she's aging, I just need some more visuals. Heh, for the stuff I was feeling under the throttle, I was kinda surprised nary a cel. There are times it was fine with a misfire here and there and other times where for sure, you will mash it and it would be no bueno
Reply With Quote
  #4  
Old 01-18-2019, 11:21 AM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 10,818
andrewwynn will become famous soon enough
I would get cel/SES occasionally with mine, it would usually happen at start and then the limo mode stayed until I reset it. Happened about 3 times over a year.

Then wife's started to do it but much more regularly but when code was on one cylinder regularly I went to swap coil packs to see if the trouble migrate but I pulled the plug at the same time it was horrible after less than 30,000 mi.

I swapped her plugs back to OE brand and problem vaporized.

Spark fuel air that's as simple as it gets. It's nearly impossible to get a misfire from air problem just lean/rich codes so misfire is almost always fuel or spark. Clean/swap coil or injector to see if a problem cylinder will migrate to a different cylinder and make sure your fuel pressure maintains under heavy throttle.

The computer does not keep track of fuel pressure it assumes it's always exactly 50psi. It meters the fuel using milliseconds of injector timing and will use the wrong amount of fuel if the pressure is other than 50psi.
__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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 08:13 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.