High Idle ‘14 STR - Triumph675.Net Forums
 
Thread Tools Display Modes
post #1 of 5 Old 06-24-19, 22:12 Thread Starter
Rookie28
Junior Member
 
Rookie28's Avatar
 
Join Date: Dec 2015
Posts: 111
Thanks: 97
Thanked 22 Times in 19 Posts
Garage
High Idle ‘14 STR

Hello! I’m seeing some strange behavior with my ‘14 STR (54k miles young) and was wondering if anyone else has had the same experience and if it’s even something to be concerned about.

I just did a 6k mile service. Oil, oil filter, air filter, spark plugs (replaced), throttle bodies balanced, and topping off fluids.

Now when I start up, the bike spikes straight to 2,500rpm for a few secs, then 2k, then after ~30 secs it settles into 1,500ish.

After that, for the next few mins, whenever I come to a stop, the idle hangs at 2k for ~15 secs before settling back to around 1,500rpms again.

Aside from the funky behavior, there are no errors showing on the DealerTool and bike rides smooth as butter through the entire RPM range.

Seems like this has been happening to others after balancing throttle bodies, but no one has received a clear answer on the other forums. Anyone know what’s up?

Video link:
https://youtu.be/0dzbQTgvrAE

Sent from my iPhone using Tapatalk

Last edited by Rookie28; 06-24-19 at 22:25.
Rookie28 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 06-25-19, 07:41
Gosling 1
Member
 
Join Date: Dec 2013
Location: Danbury
Posts: 210
Thanks: 2
Thanked 22 Times in 22 Posts
Since you had the air box off to replace the spark plugs, I would have a close look at the rubber boots where the box connects to the throttle bodies. If one of them is not seated properly, you might have air getting in.
Gosling 1 is offline  
The Following User Says Thank You to Gosling 1 For This Useful Post:
Rookie28 (06-25-19)
post #3 of 5 Old 06-25-19, 19:54
Phicurious86
Member
 
Phicurious86's Avatar
 
Join Date: Mar 2016
Location: Phoenix, AZ
Posts: 580
Thanks: 31
Thanked 78 Times in 67 Posts
Garage
Could also be the idle stepper motor. Either gummed up on the stepper arm or going bad. My stepper motor went on my Daytona at about 22k, though in my case the revs were dropping too low rather than too high.

Sent from my Pixel 2 using Tapatalk
Phicurious86 is offline  
The Following User Says Thank You to Phicurious86 For This Useful Post:
Rookie28 (06-25-19)
 
post #4 of 5 Old 06-25-19, 21:49 Thread Starter
Rookie28
Junior Member
Threadstarter Threadstarter
 
Rookie28's Avatar
 
Join Date: Dec 2015
Posts: 111
Thanks: 97
Thanked 22 Times in 19 Posts
Garage
Thanks for the replies!

I just removed the airbox and re assembled making sure that the seals sit correctly. Also visually inspected the stepper motor and dind’t see anything that could be restricting its motion.

Put it all back together and the bike still jumps to 2.5k rpm

I’m trying to do the 12 min adaptation reset to see if it helps, but looking in DealerTool shows “closed throttle adaptation: yes”. Not sure if that means it worked or not

Also something that I did this latest service that may or may not have to do with this. I placed a magnetic tray on top of the airbox when removing its bolts. After, I realized that the tray was sticking to the airbox... it was attaching to what I think is the immobilizer unit that sits inside the airbox. By then it was too late to do anything about it, but is that something that could be causing the odd idle?
@Phicurious86 , how do you diagnose a faulty stepper motor?


Sent from my iPhone using Tapatalk
Rookie28 is offline  
post #5 of 5 Old 06-26-19, 01:49
Phicurious86
Member
 
Phicurious86's Avatar
 
Join Date: Mar 2016
Location: Phoenix, AZ
Posts: 580
Thanks: 31
Thanked 78 Times in 67 Posts
Garage
Quote:
Originally Posted by Rookie28 View Post
Thanks for the replies!

I just removed the airbox and re assembled making sure that the seals sit correctly. Also visually inspected the stepper motor and dind’t see anything that could be restricting its motion.

Put it all back together and the bike still jumps to 2.5k rpm

I’m trying to do the 12 min adaptation reset to see if it helps, but looking in DealerTool shows “closed throttle adaptation: yes”. Not sure if that means it worked or not

Also something that I did this latest service that may or may not have to do with this. I placed a magnetic tray on top of the airbox when removing its bolts. After, I realized that the tray was sticking to the airbox... it was attaching to what I think is the immobilizer unit that sits inside the airbox. By then it was too late to do anything about it, but is that something that could be causing the odd idle?
@Phicurious86 , how do you diagnose a faulty stepper motor?


Sent from my iPhone using Tapatalk
Not sure. Think it might throw a code if it completely dies, but mine never threw a code before I got rid of it and rigged up a manual idle adjuster.

Sent from my Pixel 2 using Tapatalk
Phicurious86 is offline  
The Following User Says Thank You to Phicurious86 For This Useful Post:
Rookie28 (06-26-19)
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Triumph675.Net Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode


Forum Jump

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome