Sluggish GL1500 in overdrive


Information and questions on GL1500 Goldwings (1988-2000)
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2manywings
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Sluggish GL1500 in overdrive

Postby 2manywings » Tue Nov 11, 2014 8:26 pm



Looking for advise regarding a puzzling problem I'm having with a friend's 1990 GL1500 w/Champion Escort sidecar. He recently bought this bike from a couple that hadn't used it hardly at all in the past several years, so we knew there was some maintenance to be done.Upon his initial test drive, the stock front end felt sooo unstable that he didn't feel comfortable getting it out on the highway. So the first order of business was the installation of an EZ-Steer front end ( shaking is all gone). He know felt comfortable enough to take it up to highway speed, but it struggled to reach 70 mph, so we aligned the car to Champion specs, with no real improvement. Powering up through the gears,it would pull like a freight train through 4th gear, but when you shift into 5th gear, it just flattens out. You could hold the throttle wide open, but the speed wouldn't increase. We tore into the fuel system, changed all of the filters, replaced the fuel with fresh,checked fuel pump output, boiled and rebuilt the carbs with Randakk's master kit, inspected and replaced all bad vacuum hoses ( yes the ones under the rubber boot too), the isolators, and the slides and diaphragms. Also changed the plugs, did a compression check and checked the coils for a good strong spark. The bike starts and runs mucccch better, but still falls flat on it's face when shifted into OD. It still pulls very strong through 4th gear (I can run it up to 70mph in 4th gear), shift into OD and BLAH. First I thought that maybe it was lacking vacuum to the slides, but you can Red-Line this thing in 1st through 4th, so I don't think that's an issue. Does shifting into OD do something to the ignition? Thanks in advance for any ideas !



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virgilmobile
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Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Tue Nov 11, 2014 8:46 pm

Actually the ignition system timing is altered when the trans is shifted into the last 2 gears.
Question..does the "OD" light operate?
When its light,the same switch wire is fed to the ECM module to signal it to change the timing.

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Re: Sluggish GL1500 in overdrive

Postby 2manywings » Tue Nov 11, 2014 9:50 pm

Yes the OD light does work. I just picked up a manual for this model year wing, so hopefully there is a procedure for testing the ECU. Thanks for the reply

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Re: Sluggish GL1500 in overdrive

Postby 2manywings » Tue Nov 11, 2014 9:56 pm

Are you saying that if the OD light is burned out that the signal does not get sent to the ECU? The light was not working, but I just replaced the burned out bulb. I haven't driven the bike since replacing it.

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Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Tue Nov 11, 2014 10:57 pm

Buy the closest schematic ive got,the gear selector switch OD wire ties to the ECM and the lamp.Just the lamp bad should not interfere with the signal.
However its possible that with a bad lamp,the ECM was not getting the 12 volts from the lamp and "seeing" it switch to ground.
When not in OD,that wire from the lamp and switch would be 12 volts ...Then in OD the switch shorts it to ground to turn on the lamp.....the same time,the ECM sees the change from 12 volts to ground.
Soooo...i can see that its possible...Ive not actually tried this.
Ill have more time to dig a bit deeper tomarrow in the control system.

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virgilmobile
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Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Wed Nov 12, 2014 8:17 am

This makes me wonder.
Is it possible that there was a modification done to the bike when the side car was installed to make it do this??
Kind of a limiter of sorts.
While poking around,keep a eye for any "add ons" ...wire tied boxes cut wires or plugged off vacuum lines.

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virgilmobile
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Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Wed Nov 12, 2014 10:36 am

I'm not finding anything else specific to OD other than the input to the ECM.
As I recall,even the air shot valves are RPM specific,not gear selection.
Do check the vacuum line that feeds the ECM...Mine was hard,cracked and leaking where it connected to the intake.
Do you recall if the cruise would set in OD.?

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Re: Sluggish GL1500 in overdrive

Postby 2manywings » Wed Nov 12, 2014 12:05 pm

First off... I want to thank you for your response and obvious understanding of the circuitry (not my strong point). The cruise control would not "set" on my last test ride with car installed. I suspected a gummed up switch that I planned on cleaning, not thinking that this may be related. I've installed several cars over the years and have never seen one that has any kind of limiter devises added. The bike has had some amateur wiring done so there is a bit of a spaghetti mess going on if you know what I mean. I'll look very closely through that, but it mostly for lighting.
I do have to keep all of my steps straight before I get confused as to where I am in the process. With that said, as I was returning from my last ride with the car installed,I thought that I'd slip the car off and ride it as a two wheeler to see if it performed differently. Along with taking the car off, I replaced the bad OD bulb. Took it back out for a ride (as a two wheeler) and I ran it up to around 85mph before backing out of it (with an EZ-Steer front end it's a little uneasy feeling). I'm going to check the voltage input to the ECU with the bad bulb verses the good one. I've also now got the test procedures for all components so I'll try to do all of those before going much further. The bitch is that in order to test it under normal conditions involves putting the car back on which I'm getting very good at. All this as I'm sitting hear typing and watching it SNOW! I'll keep trudging along. Thanks again for your input !!!

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Re: Sluggish GL1500 in overdrive

Postby WingAdmin » Wed Nov 12, 2014 12:17 pm

The cruise control should engage in both 4th and 5th gears. Have you tried to see if it will engage in 4th gear?

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virgilmobile
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Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Wed Nov 12, 2014 12:20 pm

Just a point of interest...
The cruise set can only happen when the bike is in 4th or OD.
(Besides speed and safety switches)
It "looks" at the same 2 wires that feed the ECM.
If it does not know your in OD,it won't "set".
With a bit of luck,the bad lamp causes a faulty reading by the ECM making it thing its in neutral.
Fingers crossed here.
Snow snow go away ^•^
Or as our weatherman here in Louisiana says ..sneaux.. :lol:

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Re: Sluggish GL1500 in overdrive

Postby WingAdmin » Wed Nov 12, 2014 12:40 pm

virgilmobile wrote:Just a point of interest...
The cruise set can only happen when the bike is in 4th or OD.
(Besides speed and safety switches)
It "looks" at the same 2 wires that feed the ECM.
If it does not know your in OD,it won't "set".
With a bit of luck,the bad lamp causes a faulty reading by the ECM making it thing its in neutral.
Fingers crossed here.
Snow snow go away ^•^
Or as our weatherman here in Louisiana says ..sneaux.. :lol:


That's why I asked if it allowed the cruise to work in 4th. If cruise works in 4th but not fifth, and we are seeing this bogging down issue in 5th, there may be an issue with that wire on the 5th gear from the gear position sensor that is making the ECU think it is in first gear (which is what it thinks if it sees no input at all from the gear position sensor).

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virgilmobile
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83 GL1100 standard
84 GL 1200 I

Re: Sluggish GL1500 in overdrive

Postby virgilmobile » Wed Nov 12, 2014 1:38 pm

Yup.same thought.you just posted quicker than me.
I've never heard of this symptom before so its of interest.

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2manywings
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Re: Sluggish GL1500 in overdrive

Postby 2manywings » Fri Nov 14, 2014 2:35 pm

I've been trying to deal with the sudden influx of COLD and SNOW up here. I did get a little break in the weather yesterday afternoon, so I bolted the car back on and took it out for a ride to see if hopefully the bad light was the whole problem... No luck! So kind of back to square one. I'm going to strip it down so I can start testing components. I'll check the ECU first to see if everything there is getting the power it should be. I'll keep you updated. Thanks again folks!

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Re: Sluggish GL1500 in overdrive

Postby 2manywings » Fri Nov 14, 2014 2:41 pm

Forgot to also state that the cruise did set in both 4th and 5th gears. I did have to massage the set button to get it to set. I can't say if the OD bulb replacement made a difference in the cruise or if the switch was just sticky on my initial ride... I'll never know. I know that you guys were wondering if the two problems were related.




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