Absolute Pace

Welcome to Club Cobra.

You are currently viewing the world's largest resource for Shelby related information as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!


Go Back   Club Cobra > Club Forums > Australian Cobra Club

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Keith Craft Racing
Nevada Classics
MMG Superformance
Main Menu
Nevada Classics
Nevada Classics
Advertise at CC
Banner Ad Rates
MMG Superformance
Planet Cobra
MMG Superformance
December 2018
S M T W T F S
            1
2 3 4 5 6 7 8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31          

Kirkham Motorsports

Like Tree6Likes
  • 3 Post By Modena
  • 1 Post By Gav
  • 1 Post By Treeve
  • 1 Post By sjelby

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 12-29-2016, 04:06 AM
sjelby's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2010
Location: Golden Square,
Posts: 158
Not Ranked     
Default Long term fuel trim in LS1

My problem is the long term fuel trim changes when the engine is off and I depress the accelerator.
Any one have any ideas?
Stan.
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 12-29-2016, 06:42 AM
albanycobra's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2005
Location: Perth, wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
Not Ranked     
Default

get the ecu flashed and turn the LT fuel trim off
__________________
RF12 414 Windsor 8 stack ,6spd, Avons
Reply With Quote
  #3 (permalink)  
Old 12-29-2016, 04:34 PM
Gav's Avatar
Gav Gav is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2006
Location: Mildura, vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,346
Not Ranked     
Default

Not sure what you mean Stan?
Are you having issues when the car has not been ran for a while?
__________________
Powered by Cu
Reply With Quote
  #4 (permalink)  
Old 12-29-2016, 05:30 PM
sjelby's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2010
Location: Golden Square,
Posts: 158
Not Ranked     
Default

I had the ecu done to start mafless , it starts fine, I have it at the tuners and he is getting it running properly before it get put on the dyno.
His msg to me was,
I have ti find out why the long term fuel trims change without the engine running when I depress the accelerator.
Got me stumped, I'ma bricky .
Stan.
Reply With Quote
  #5 (permalink)  
Old 12-30-2016, 02:49 AM
Modena's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Nov 2009
Location: Cheltenham, Vic
Cobra Make, Engine: Classic Revival CR3516, LS3, Aussie Mike'd T-56, 3.70 LSD, AP brakes, Penske shocks
Posts: 1,598
Not Ranked     
Default

If he says that and asks you to find out why, get a new tuner!
albanycobra, Gav and Cobra72 like this.
__________________
BUILD-BLOG: http://cobrablog.holnet.net
Ben in AU
Reply With Quote
  #6 (permalink)  
Old 12-30-2016, 04:32 AM
Gav's Avatar
Gav Gav is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2006
Location: Mildura, vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,346
Not Ranked     
Default

Ditto to the above.
albanycobra likes this.
__________________
Powered by Cu
Reply With Quote
  #7 (permalink)  
Old 12-30-2016, 02:22 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2011
Cobra Make, Engine: Gardner Doulgas
Posts: 47
Not Ranked     
Default

No leaking fuel injectors or air leak ?
Reply With Quote
  #8 (permalink)  
Old 12-30-2016, 02:56 PM
Rich A's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2000
Cobra Make, Engine:
Posts: 304
Not Ranked     
Default

Quote:
Originally Posted by Modena View Post
If he says that and asks you to find out why, get a new tuner!
Ditto!!! get a new tuner!!!
Reply With Quote
  #9 (permalink)  
Old 12-30-2016, 04:06 PM
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2011
Location: Orange, NSW
Cobra Make, Engine: Dax
Posts: 393
Not Ranked     
Default

I agree. If the man with the dyno is asking his customer why the ECU is behaving like it is - it means he doesn't know... and hence he doesn't know enough to tune it properly.

Get a new tuner. Find one experienced in your ECU and you will save yourself hours of dyno time and end up with a better result in the long run.
deano59 likes this.
Reply With Quote
  #10 (permalink)  
Old 12-31-2016, 09:27 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2006
Location: St. Louisville, Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,000
Not Ranked     
Default

I agree with the above comments, but I will elaborate... make that speculate.

I suspect that the memory location that he is looking at is not actually the long term fuel trims, therefore what ever software he is using is not mapped correctly for your ECU.

It is possible that your ECU has been flashed to something other than what the box originally was and therefore he does not have the correct software to look at it. What do you know of the history of your ECU? Could it have been played with by someone else, unknown to you? If not, you can rule this out.

It is possible that this fellow is just not using the correct software for your ECU. If this is the case, you really have the wrong guy.

If my assumption is wrong and the actual LT fuel trim is changing, then I would say that your ECU has been hacked up by some tuner, or it is defective.

I'm no expert, but this would be my first thoughts.

Last edited by olddog; 12-31-2016 at 09:31 AM..
Reply With Quote
  #11 (permalink)  
Old 01-01-2017, 01:09 AM
sjelby's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2010
Location: Golden Square,
Posts: 158
Not Ranked     
Default

Thanks everyone.
Old dog you maybe one to something there.
The ecu was sent off ages ago to get the vats Removed so it would at least start, but that was you another guy. I will ring him and find out what program he runs and see if it is a clash of programs causing this.
Stan.

Liam.
Hope to have it on the road this year., but then again I said that last year.lol
Reply With Quote
  #12 (permalink)  
Old 01-11-2017, 02:20 PM
sjelby's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2010
Location: Golden Square,
Posts: 158
Not Ranked     
Default

Problem Solved.
Now that Summernats is over we had another look at the motor.
A change of throttle body and everthing is fine.
The idle motor was siezed and also the seal on the manifold pressure sensor was buggered.
Changed them out and its behaving itself now.
Probably a common thing with secondhand motors.
The old box of chocolates theory.
onto the next job.
Now everything is working fine its tidy up all the wiring and it wont be long till the body goes on for the last time.
Stan.
deano59 likes this.
Reply With Quote
  #13 (permalink)  
Old 01-17-2017, 12:59 AM
renovationinnov's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2010
Location: redcliffe, qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 498
Not Ranked     
Default

and you said that how many times ago
__________________
not all your babies are your children
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 -7. The time now is 07:09 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy