Club Cobra Keith Craft Racing  

Go Back   Club Cobra > Manufacturers, Engine Builders, tools, and parts. > BackDraft Racing ---

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

MMG Superformance
Nevada Classics
Keith Craft Racing
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Keith Craft Racing
Keith Craft Racing
Advertise at CC
Banner Ad Rates
MMG Superformance
Keith Craft Racing
December 2022
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 Tree5Likes
  • 1 Post By russdana
  • 2 Post By HighPlainsDrifter
  • 2 Post By Tommy

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 07-20-2022, 10:51 AM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2020
Location: League City, TX
Cobra Make, Engine: Backdraft w/ 427IR
Posts: 66
Not Ranked     
Default Roush 427IR Idle issues are Back!!

I have Backdraft with a 427IR with 3.5K miles. I normally pull her out of the garage and let her warm up for about five minutes before going for a drive. She usually idles around 1050-1100 rpms. Here lately the RPMs will drop to around 800 and almost stalls before the engine RMPs jump backup to 1050. This will go on for a few minutes before the engine eventually stalls. This exact same thing happen about a year ago (see post) below. The first time this happen I installed an areomotive 340 fuel pump and replaced the wiring connectors and changed fuel filter downstream of pump. I thought this fixed the issue but about a month later I had the same issues. The problem just went away. Well its back. See video below. Any advice will be appreciated. Mike

https://youtu.be/2eeasd1m2bA


Roush 427IR Idle issues
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 07-20-2022, 06:25 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2010
Location: Saint Augustine, FL
Cobra Make, Engine: Backdraft Lingenfelter LS-7
Posts: 6
Not Ranked     
Default

I had same issue but have an LS. Mine would sometimes almost die after heated and driving at same rpm for awhile then pushing clutch it would have to catch itself. Had to retune it. Not sure about your injection but might be something to look at.
169mph likes this.
Reply With Quote
  #3 (permalink)  
Old 07-22-2022, 08:35 AM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 2,109
Not Ranked     
Default

Which EFI system are you using? Have you data logged the engine while it is misbehaving and what diid the data log say?
__________________
.


Help them do what they would have done if they had known what they could do
.
Reply With Quote
  #4 (permalink)  
Old 07-22-2022, 12:10 PM
patrickt's Avatar
Half-Ass Member
Visit my Photo Gallery

 
Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,470
Not Ranked     
Default

If that was a Holley four barrel, I would bet my bottom dollar the air bleeds were clogged with crap. Seen it many, many times. Now, I know that's not what you've got, but just keep that in mind as you diagnose your system.
Reply With Quote
  #5 (permalink)  
Old 07-22-2022, 12:37 PM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2020
Location: League City, TX
Cobra Make, Engine: Backdraft w/ 427IR
Posts: 66
Not Ranked     
Default

Quote:
Originally Posted by eschaider View Post
Which EFI system are you using? Have you data logged the engine while it is misbehaving and what diid the data log say?
I have a XFI Sportsman but I don’t have any data. I assume I need to purchase their software to pull the data or see it real time?? I wouldn’t feel comfortable tuning but I would definitely like to see what’s going when she’s idling up and down. I plan to check / re-torque the intake manifold this evening. I believe intake should be torqued to 23ft/lbs? I appreciate the help.
Reply With Quote
  #6 (permalink)  
Old 07-22-2022, 01:28 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 2,109
Not Ranked     
Default

Duplicate post
__________________
.


Help them do what they would have done if they had known what they could do
.

Last edited by eschaider; 07-22-2022 at 01:35 PM..
Reply With Quote
  #7 (permalink)  
Old 07-22-2022, 01:34 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 2,109
Not Ranked     
Default

That is one of FAST's systems and it is a fairly nice system. When you bought the system from FAST (through Roush) FAST provide the tuning softwqre and the data logging software as part of the purchase. Try contacting Roush and asking them to forward the software to you. You have already paid for these tools, you should have them to research and fix these sorts of whoopses.
__________________
.


Help them do what they would have done if they had known what they could do
.
Reply With Quote
  #8 (permalink)  
Old 07-23-2022, 12:38 PM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2020
Location: League City, TX
Cobra Make, Engine: Backdraft w/ 427IR
Posts: 66
Not Ranked     
Default

I took her for drive yesterday and she idled nice and smooth. I didn’t change anything. Started her today and the idle issue is back. I kept the engine from dying until engine was warmed up and then I revved the engine up three or four times. The engine idled fine until I turned the headlights. Immediately after turning the lights on the engine acted like it was going to die. The same thing happened when I turned electric fan on. Note that these issues usually go away after I’ve been driving her for 5-10 miles. Could this be alternator issue? Thanks, Mike
Reply With Quote
  #9 (permalink)  
Old 07-23-2022, 02:11 PM
HighPlainsDrifter's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2000
Location: Chilliwack,BC, BC
Cobra Make, Engine: F5 Roadster
Posts: 1,379
Not Ranked     
Default High esistance

you probably have a bad engine ground, higher resistance means lower amperage. also clean and file the back of the alternator where the long bolt goes into engine. If it is a chrome alternator file the chrome of that spot.
Perry
Ozzie Goat and 169mph like this.
__________________
F5 cobra Mark 4 roadster, dual 2" roll bars, warmed up 302, E Street aluminum Heads, Comp cam and roller rockers, AOD, 4.10 Eaton Possi, Power Baer/disc brakes, block hugger headers and under car exhaust, F500 18" black spoke wheels.
Reply With Quote
  #10 (permalink)  
Old 07-23-2022, 09:01 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 2,109
Not Ranked     
Default

If you have electircal supply issues, fuel delivery issues, sensor related issues or any of a myriad of others, data logging the interesting signal during an engine misbehavior event will immediately tell you what is going on with that particular system. If it is misbhaving then you will know where to look for gremlins. If it is not misbehaving it tells you the problem is elsewhere and may even point you in the direction you need to go depending on what other signals you were watching at the time.
__________________
.


Help them do what they would have done if they had known what they could do
.
Reply With Quote
  #11 (permalink)  
Old 07-23-2022, 09:22 PM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2020
Location: League City, TX
Cobra Make, Engine: Backdraft w/ 427IR
Posts: 66
Not Ranked     
Default

Quote:
Originally Posted by eschaider View Post
If you have electircal supply issues, fuel delivery issues, sensor related issues or any of a myriad of others, data logging the interesting signal during an engine misbehavior event will immediately tell you what is going on with that particular system. If it is misbhaving then you will know where to look for gremlins. If it is not misbehaving it tells you the problem is elsewhere and may even point you in the direction you need to go depending on what other signals you were watching at the time.
I’m calling Roush Monday morning to see if they can provide me the tuning and data logging software. As always I appreciate your help.

Mike
Reply With Quote
  #12 (permalink)  
Old 08-17-2022, 10:12 AM
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2020
Location: League City, TX
Cobra Make, Engine: Backdraft w/ 427IR
Posts: 66
Not Ranked     
Default How do my spark plugs look?

I finally found time to pull the spark plugs, which has been a pain. Regardless, I took a few pics to get opinions on how they look. 427IR w/ 3400 miles. I apologize for the size of the pics. Thanks, Mike
Attached Images
  
Reply With Quote
  #13 (permalink)  
Old 08-17-2022, 10:21 AM
Tommy's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2002
Location: Dadeville, AL
Cobra Make, Engine: Sold my EM.
Posts: 2,248
Not Ranked     
Default

If that plug was from one of those highly complex and difficult to tune carbureted engines, I'd say it was running rich.
twobjshelbys and 169mph like this.
__________________
Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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 10:34 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2022, 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
Links monetized by VigLink