Intermittent Loss of Power


Information and questions on GL1200 Goldwings (1984-1987)
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noycebj
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Location: Albuquerque, NM
Motorcycle: 1985 GL1200

Intermittent Loss of Power

Postby noycebj » Mon Jun 04, 2012 3:25 pm



I recently traded for a '85 GL1200 Interstate. It has been sitting under a tarp in a field for about 13 years. Amazingly enough she runs well after replacing 2 of the 4 carburetor slides. She’s kind of a restoration project, but still having a blast since upgrading from a 2000 Honda Shadow 600 VLX.
The only area of concern at this point is when I start riding after letting her sit overnight or all day, once she gets warm (approx 1/3 on the temp) and usually after getting on the freeway or nice straight stretch of road, when will lose all engine power, completely killing the engine. At first I thought I forgot to turn on the gas it had that same feel, however gas was on. The first couple of times I left her in gear and continued to roll at speed, she'd back fire a couple of times, and then pop start the engine and would be fine. Now I've pulled in the clutch, wait a second or two, and usually start the engine back up using the starter (preventing gas buildup resulting in a very loud backfire). I learned the hard way one morning while ridding to work on the freeway and the same symptoms occurred, right next to a patrol car. Before I knew it, BANG! right next to his window.
I've talked with a couple of other riders and friends and we're pretty much baffled on the symptoms. She backfires so she's getting gas. I've considered vapor lock since it happens on a low tank of fuel except this morning as I was coming in on a full tank it happened again. Power to the engine is only lost for a second or two, the clock and lights stay on during this event. It doesn't happen every time, but usually when she gets to that temp, it occurs. If she makes it past that temp, it will not happen.
I've ready many posts about older components wearing out and failing after they get warm, let them cool and they will operate again. Whatever this is, it gets warm, 'fails' for a second or two, and then presses on.
I'm going to replace all of my fuel lines and filter, but if anyone has any other suggestions or similar occurrences, I would sure like to hear from you.

Thanks
Ben



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virgilmobile
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Motorcycle: 1988 GL1500 I
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83 GL1100 standard
84 GL 1200 I

Re: Intermittent Loss of Power

Postby virgilmobile » Mon Jun 04, 2012 4:10 pm

It sounds like the ignition is dying.
It will be a hunt and peck to find it but here are some guidelines.
The ignition coils and ignition module must have 12 volts with the key on.
It is provided through the ignition switch and "kill" switch.Because everything stays on,you can eliminate the ignition switch.
The kill switch is first suspect.
Second....the ignition is controlled by "pulse coils"..either 2 or 3 of them depending on your configuration. 2 are used for the ignition and if it has the 3rd one in the timing belt area,it is used for timing control by the module
I have read about the pulse coils going "thermal",meaning they would change resistance when heated.
Also the module can fail when hot,but not a likely.

You should download the schematic/manual and locate the test points for the volts and resistance measurements,check them when the bike is running and then again when it quits.

If it won't quit long enough to test,on one project,I actually hooked a meter to the volts going to the module and watched it when it died.
That one stayed on.
The next step was to hook to the pulse coil.They produce a small voltage when running,actually very fast pulses,but the meter shows pretty steady.
When it quit,I could no longer get any pulses from the pulse coil till it cooled down.
That one had a thermal pulse coil.
Some testing is in order.Try to avoid just replacing parts and hoping one of them fixes it.That usually ends up costing a bunch of money.
Let us know if you need more help in the testing method,and include if your bike is a carb type or fuel injected.I won't assume either one.

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noycebj
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Location: Albuquerque, NM
Motorcycle: 1985 GL1200

Re: Intermittent Loss of Power

Postby noycebj » Wed Jun 06, 2012 1:23 pm

Thank you for the response, I will attempt to test it this weekend. It's strange that some days it will cut out and others it won't so we'll have to see how it plays out.

I did download the schematics as well as found another forum that someone described the same issue. Seems rare to have P.Gens go out from researching posts.

In the mean time, I'm continuing to enjoy my first Goldwing. Other small quirks but one thing at a time. :D

Will post with the results.

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tricky
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Re: Intermittent Loss of Power

Postby tricky » Wed Jun 06, 2012 6:33 pm

Been there done that, same thing happened on my 85 Aspy, I changed fuel filter, fuel lines, plugs, etc etc etc.

Sometimes it would run all day long, the next day it would fart and back fire and splutter.

Change your pulse generators, if it isnt them then you will have a spare set for when they do go.

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virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Intermittent Loss of Power

Postby virgilmobile » Thu Jun 07, 2012 9:10 am

A guy in Ohio has the same problem and I created/located the same thing on my 84.
Have a read on this post I made up to test the system.
It does seem that the coils are OK in most cases and it fails in the corroded connectors.
Remember,the first part of the ignition system is running at less than 1/2 volt DC,so any little loss of connection can kill it.
viewtopic.php?f=16&t=11800

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noycebj
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Re: Intermittent Loss of Power

Postby noycebj » Fri Jun 08, 2012 6:19 pm

Very Helpfull! :D I know what I'm going to test this weekend.
Thanks.

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noycebj
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Re: Intermittent Loss of Power

Postby noycebj » Mon Jun 11, 2012 7:37 pm

Well, was doing some research, looks like the 84 had the pulse gens and the 85 went away from them.

I have the ignition coils (2ea) and rectifier.

ideas on how to test them, if not the same method?

Now i'm really confused. some diagrams show no Pulse Gen, while others do. This is insane. I guess I will continue to look and test.

BTW, I did get a can of Sea Foam for my fuel, blowing blue smoke :roll: ; but it did help the carbs. Put some in my crank case, and changed the oil, boy did it help. I was thouroughly impressed.
Last edited by noycebj on Mon Jun 11, 2012 7:46 pm, edited 1 time in total.

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tricky
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Re: Intermittent Loss of Power

Postby tricky » Mon Jun 11, 2012 7:44 pm

84 pulse gens are at the rear of the engine
85+ pulse gens are located where the timing belts are. Item 19
Attachments

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noycebj
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Joined: Mon Apr 30, 2012 11:53 pm
Location: Albuquerque, NM
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Re: Intermittent Loss of Power

Postby noycebj » Mon Jun 11, 2012 7:48 pm

Thanks

there seems to be a lot of different diagrams out there.

will check it out

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virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Intermittent Loss of Power

Postby virgilmobile » Mon Jun 11, 2012 7:54 pm

I'm not aware of any wing after 80 that doesnt use a pulse generating coil. I know there may be optical trigger wheels on some other bikes

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Intermittent Loss of Power

Postby virgilmobile » Mon Jun 11, 2012 7:59 pm

Reguardless of how many or where there located,a simple meter can test their operation




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