GL1800 FI mil #25 - Steve Saunders Goldwing Forums

LinkBack Thread Tools
post #1 of 5 (permalink) Old 05-19-2013, 04:25 PM Thread Starter
Junior Member
Join Date: May 2013
Location: Lantana, FL
Model: 2003 GL 1800
Posts: 3
GL1800 FI mil #25

Hi Folks,

I am brand new to your web site. Read good things about it and wanted to be a part of it. So thanks! I am experiencing my first problem with my 2003 GL 1800 with 28,000 miles. I was cruising down the highway at 65 or so for about 15 miles after a lunch break and notice the bike begins to "buck" or "hesitate". Not drastically but definitely. Then I notice the "FI" light is lit. Eventually I come to a traffic light and idle RPM fluctuates between being on the verge of stalling to about 1300 RPM. It stalls but restarts easily. I must keep the RPM's up around 1000-1500 to keep it running. I make it to my friends house and determine the code is a "MIL 25". This morning I am to make the trek home, approx. 300 miles. I come out this A.M. bike starts and is idling normally with no "FI" light. I drive for about 30 miles, everything normal. Then it comes on and begins to hesitate. May have been a dumb move but I make the drive home. Gas mileage seemed worse than average though I didn't actually keep it.

Being a guy who likes to do his own work on my bike I break out the Honda Service Manual and look up MIL 25 and I'm already in a qaundry which is this. Under the "Symptoms" column the only alternative it gives is "Engine operates normally". But obviously from my above description it isn't operating normally. So, my question are: 1) How do I proceed when, in the first step, I am given a symptom which is not true of my bike and 2) Any insights to share with me in light of this code.

Thanks in advance for taking the time to help me out. It's much appreciated.
PROPITIATED is offline  
Sponsored Links
post #2 of 5 (permalink) Old 05-19-2013, 04:44 PM
Senior Member
glhonda's Avatar
Join Date: Jun 2010
Location: Olympia, Washington, USA
Posts: 2,163
My only question is how did you determine it was code 25?
According to the diagnostic chart, it's for the right knock sensor. And as a general rule, this is only an open circuit code. It does NOT determine there is a knock, only that it has no way to monitor it. And also as a general rule, the knock sensor doesn't exhibit any driveability complaints, unless the vehicle is turbo charged, in which case it will prevent the turbo, or blower from working. At most, it might retard the timing a few degrees. But since the book says "NO drive complaints", I have to assume it's not programmed that way.
Have you checked for tech bulletins?

Libraries are full of stuff I don\'t know.
glhonda is offline  
post #3 of 5 (permalink) Old 05-20-2013, 02:45 AM
Other side of the pond
englishted's Avatar
Join Date: Jul 2004
Location: Peterlee, County Durham, United Kingdom
Model: GL1800, GL1500SE, GL1200A
Posts: 3,409
Knock sensors were a common failing on early GL1800s and often resulted in erratic idle and stalling.

Ted Kelly.
Current Wings; 2006 GL1800 & 1997 GL1500se.
englishted is offline  
Sponsored Links
post #4 of 5 (permalink) Old 05-20-2013, 04:53 AM Thread Starter
Junior Member
Join Date: May 2013
Location: Lantana, FL
Model: 2003 GL 1800
Posts: 3
Put the side stand down and I got two long and 5 short blinks. Thanks for your response!
PROPITIATED is offline  
post #5 of 5 (permalink) Old 05-20-2013, 10:55 AM
Gregarious Greeter
SETHAN12's Avatar
Join Date: Mar 2009
Location: Liberty, Pennsylvania, USA
Model: GL 1800
Posts: 16,809


Yesterday is for memories!
Today is for making memories!
Tomorrow is a concept that does not exist!
What are you waiting for? ... Sam-n-Elaine
Just livin\' the dream!!!!!
Just another day in paradise!!!!!
Honor above all else!!!!!
Thank you Dylan Saunders for the layout of my greeting!!!!
SETHAN12 is offline  
Closed Thread

  Steve Saunders Goldwing Forums > Forums > Goldwing Technical Forum

Quick Reply

Register Now

In order to be able to post messages on the Steve Saunders Goldwing 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


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

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
GL1800, mil blinks 25 (right knock sensor). cycleman0622 Goldwing Technical Forum 6 05-20-2013 11:38 AM
gl 1800 mil code cycleman0622 Goldwing Technical Forum 2 04-30-2011 06:51 AM
Wanna see a $5.5 Mil Mustang? UbarW Miscellaneous Forum 17 11-24-2009 07:11 AM
The $66 MIL Goldwing Okiebryan General Motorcycle Discussion Forum 15 11-11-2007 05:57 PM

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

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