86 sei problems


Information and questions on GL1200 Goldwings (1984-1987)
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binforgiven2
Posts: 25
Joined: Mon Feb 18, 2013 9:16 pm
Location: LaPorte,IN
Motorcycle: 1986 gl
1200 Aspencade sei

86 sei problems

Postby binforgiven2 » Sat Aug 24, 2013 10:32 pm



I bought my 86 sei 6 months ago and it has been in the shop ever since.At first they thought it was stator problems but ended up being a rectifier which made it so it charges now and some wiring fixed all the lights,but it is still running very sluggish.They told me i needed a throttle sensor, so i found one and took it to them and they said it made my bike run worse,said the sensor i took them was bad,so i got another one for them,same thing.They say it keeps throwing the throttle sensor code but a sensor dont fix the problem.i just bought an ecu for the cfi and am going to take that to them to try.The mechanics are completely baffled n i dont know what to try next if this ecu dont work.ANY suggestions would be greatly appreciated.They charge $75 an hour n after 6 months im starting to wonder if ill be able to afford the labor bill :(



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landisr
Posts: 393
Joined: Tue Jul 28, 2009 12:18 pm
Location: Gilbert, AZ
Motorcycle: 1976 GL1000
1994 GL1500A

Re: 86 sei problems

Postby landisr » Sun Aug 25, 2013 5:31 pm

Have they cleaned the fuel injectors?
Beam me up, Scotty. There's no intelligent life down here.

binforgiven2
Posts: 25
Joined: Mon Feb 18, 2013 9:16 pm
Location: LaPorte,IN
Motorcycle: 1986 gl
1200 Aspencade sei

Re: 86 sei problems

Postby binforgiven2 » Mon Aug 26, 2013 4:10 pm

before i took it there i ran two tanks of sea foam through it.They said a couple of injectors were leaking just a little but it wasnt a big deal.

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virgilmobile
Posts: 7663
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: 86 sei problems

Postby virgilmobile » Tue Aug 27, 2013 2:56 pm

The last time I dealt with a baffled mechanic and the owner of this model,they overlooked one detail....Voltages...
Even tho the ECM is throwing a bad throttle position sensor code...it only means that the ECM is not getting the expected voltage at the control input...
"We" found all the sensors were measured fine disconnected from the bike but still threw a bad sensor code when tested on the bike...
Ultimately the problem was located...
The throttle sensor,as well as other sensors are supplied with a 5 volt DC reference voltage from the ECM....Not surprising,it actually measured 3.8 volts with the bike running....It MUST be 5 volts.
It appeared a bad connection or corrosion in the plug that attaches to the ECM was the culprit.
Just unplugging it and using contact cleaner restored the 5 volts and fix that one...

Don't be suprised that replacing the ECM fixes the problem...The original one is very likley to be OK...just a connection problem....

Look at the voltages under operation...they are very critical...even a few tenths off and the bike runs badly.
The throttle sensor has specific voltage readings....by the book...

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virgilmobile
Posts: 7663
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: 86 sei problems

Postby virgilmobile » Tue Aug 27, 2013 3:15 pm

By all means..turn your mechanic onto this site too....It can help everybody...
Here's a few related posts...feel free to print them and present them to your mechanic.
Even I ask for help when needed.....

viewtopic.php?f=5&t=11962
viewtopic.php?f=5&t=12158

The key to his problem...
"#7 The refrerence wire coming from the ECU only showed 3.5 to 4 volts MAX when it should read no less than 5 volts. This was our first major indication of an ECU failure. You can test this by getting a good variable power source and putting 5 volts into that reference wire going to the sensors and either leaving them connected or applying 10'' vac to them. If the motor runs good then you know the ECU is at fault.

There must have been a Gremlin in the ECU because after being completely disconnected from any power and after carefully probing the circuit boards the ECU was plugged back in and the motor fired up and purrs like a kitten. I had allready ordered another ECU and plan to keep it as a spare just in case.

binforgiven2
Posts: 25
Joined: Mon Feb 18, 2013 9:16 pm
Location: LaPorte,IN
Motorcycle: 1986 gl
1200 Aspencade sei

Re: 86 sei problems

Postby binforgiven2 » Tue Aug 27, 2013 6:38 pm

wow,i looked at those other links and i just cant believe your level of knowledge on these bikes.i don't think my dealership is even that knowledgeable.Looking at those blogs i see leaky injectors could very well be at fault but i really think its the ecu from some of the things you said.Whatever,i just hope they get my bike fixed,lol.Thank you for sharing your knowledge,its greatly appreciated

User avatar
virgilmobile
Posts: 7663
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: 86 sei problems

Postby virgilmobile » Wed Aug 28, 2013 7:04 am

The Internet is a great knowledge source for anybody that wants to learn.
Just 2 years ago I did t know squat about motorcycle fuel injection systems.
Unfortunately I can only point someone in a general direction to look for problems.Its ends up being the ability of the wrench man to be able to identify "cause and effect"
If a person understands what a part is suppose to do then it can be determine if it is good or bad.
It just annoys me to no end that many "repairmen" in any field end up being parts changers.Just because a computer said it was bad,only to find it was something else causing the problem.
Just like your TPS sensor.Yours bad and another on too,now he wants a third one?Possible but how was that determined...a blinking light or actual in circuit operation tests.....

Sorry for my soap box.

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tom84std
Posts: 493
Joined: Fri Jul 13, 2012 7:40 am
Location: Arlington, Texas
Motorcycle: '84 STD 1200
2002 VTX1800
2007 Shadow 750
69 BSA Bitsa
2004 Virago
VW Trike

Re: 86 sei problems

Postby tom84std » Fri Aug 30, 2013 3:30 pm

Virgil I've been in the electrical/electronic machinery repair business for 25 years. The machines i work on have literally hundreds of connections made by quick disconnect. I can't count the number of successful repairs I've accomplished by beginning the job just wiggling plugs.
Locate, clean, tighten, immobilize. Vehicles with many slip-on connections exposed to rain and dirt, even worse.. Ohm's Law. Solder, insulate, waterproof. Don't mention Scotchlocks around me!

User avatar
virgilmobile
Posts: 7663
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: 86 sei problems

Postby virgilmobile » Fri Aug 30, 2013 8:59 pm

Scotchlocks and electrical tape in a engine compartment....Sheesh......
I see a lot of this stuff too.Part of my job is critical .Communications equipment,data transfer and emergency lighting.All mobile equipment.
This stuff just has to work,hurricane season ya know.
Lab tests are fine but real life is different.
I have to determine why a thing failed and engineer something to prevent it from happening again.
This is my drive for the right solution on my bike.Maybe a bit overengineered but I'm confident in it's reliability.




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