Join Date: Nov 2015
Location: Victoria BC Canada
Model: 1985 GL1200 Limited Edition and 1995 GL1500 SE CDN Edition
Welcome to the forum. Lots of good info here and on the other GW forums.
In order to diagnose any issue with the '85 LTD fuel injected bike, you need the service manuals. There are three; OEM service manual, Electrical troubleshooting manual and the supplement that is specific to the LTD. To isolate the issue you have to systematically rule out possible issues. If you can't get these, I have found the best of the aftermarket is the Clymer's service manual for the 1200 bikes because it also has a good section on the fuel injection system, more of an all in one book.
Symptoms that are generally fuel related can also be throttle position sensor (TPS) related, been there. Have found that the fuel system on these bikes is quite robust and fuel issues are not as frequent as others.
Would recommend a new thread on the technical forum, detail the issue(s)/symptoms. A fuel system pressure check will let you know if it is a fuel issue.
What maintenance was done prior to your purchase and when?
I have updated one '85 LTD that was on the road and resurrected another that sat for four years.
Once the bugs are ironed out, the '85 LTD is a treat to ride and enjoy.
"When writing the story of your life, Don't let anyone else hold the pen"