Idle up and down HELP


Information and questions on GL1500 Goldwings (1988-2000)
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pdqhil
Posts: 12
Joined: Sun Mar 06, 2016 8:21 pm
Location: Dewey AZ USA
Motorcycle: 1995 GLGL1500 Aspencade 20th anniversary

Idle up and down HELP

Postby pdqhil » Fri Mar 18, 2016 10:02 pm



My 95 1500 is going up and down between around 700 rpm to 1000 rpm up and down other than that it runs great



DeepSea3971
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Joined: Tue Aug 11, 2015 9:37 pm
Location: marlin,tx
Motorcycle: 1988 goldwing

Re: Idle up and down HELP

Postby DeepSea3971 » Fri Mar 18, 2016 10:19 pm

Sounds like you have a vacuum leak.

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Bluewaterhooker0
Posts: 557
Joined: Wed Nov 14, 2012 11:27 pm
Location: Tampa, Fl
Motorcycle: 1997 Goldwing GL 1500 SE

Re: Idle up and down HELP

Postby Bluewaterhooker0 » Fri Mar 18, 2016 10:58 pm

Solved mine 3 years ago with a cleanup of the carbs using Seafoam. When I got the bike it would surge from 750 to 1200 and back. Ran 1/2 can of Seafoam through a full tank of gas, and the problem was gone. It came back a couple of tanks later, so I got in the habit of running a few ounces of Seafoam in every tank at fill-up, and have had no recurrence of the problem in 3 years. I believe it has to do with deposits on the idle jets in the carburetors. BTW, letting it idle quite a bit with that first treatment will speed the cure, if that is your problem.
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spiralout
Posts: 1049
Joined: Sun Feb 17, 2013 6:41 pm
Location: Alabama
Motorcycle: 1975 GL1000 (gone)
1980 GL1100I (with '77 1000 engine)
1996 GL1500 SE

Re: Idle up and down HELP

Postby spiralout » Fri Mar 18, 2016 11:20 pm

Try running your idle adjustment out until the engine stalls then back in until it's around 850rpm.

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dingdong
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Motorcycle: 1976 gl1000
1993 gl1500
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Re: Idle up and down HELP

Postby dingdong » Sat Mar 19, 2016 7:57 am

There is a vacuum line with a 90º bend that runs under the carbs. It is a common problem that developes with aging gl1500s. If the SeaFoam doesn't work then this is usually the problem. There are a number of threads on this site describing the problem. Carbs have to be removed to repair.
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Tom

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pdqhil
Posts: 12
Joined: Sun Mar 06, 2016 8:21 pm
Location: Dewey AZ USA
Motorcycle: 1995 GLGL1500 Aspencade 20th anniversary

Re: Idle up and down HELP

Postby pdqhil » Sat Mar 19, 2016 8:50 am

Thanks guys I am hoping it was the choke not being all the way off as I read on another thread this is only ride 3 on bike 1 and 2 were perfect and if so you may clown me a bit

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johnfliesagain
Posts: 48
Joined: Tue Jan 12, 2016 6:10 pm
Location: Baltimore, MD
Motorcycle: 2000 GL1500SE Anniversary Badge
Yamaha 79 XS750; 80 XS850
Picture of one of my Triples Yamaha xs750 '79 at Timonium Bike Show 2015

Re: Idle up and down HELP

Postby johnfliesagain » Sat Mar 19, 2016 10:42 am

dingdong wrote:There is a vacuum line with a 90º bend that runs under the carbs. There are a number of threads on this site describing the problem. Carbs have to be removed to repair.



O K After searching I found the home page of the picture above wow what an article!

I have only a slight "surge" thought it my be sync ing but this leads me in a whole different direction. My bike was also sitting, and my P O didn't do a lot... he just wasn't the type to take things apart...and he lived in an aparment w/o a garage so the link:

http://www.jmartino.me/carb/
John in Baltimore
A proud owner of a 2000 1500SE
:D Did I mention it was a Free Gift from a co-worker?

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Mh434
Posts: 944
Joined: Tue Mar 25, 2014 10:24 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1997 gl1500 SE
Previous:
1981 GL1100I
1989 Kawasaki Concours

Re: Idle up and down HELP

Postby Mh434 » Sat Mar 19, 2016 11:21 am

Personally, before tearing the bike apart, I'd try the Seafoam. I had an idle surging/rough idle situation (due to bad gas) and after several tanks of SF-treated fuel, it went back to normal - smooth, steady 850 RPM idle. Saved me from tearing the whole bike apart!

I used a fairly heavy application (1/2 can into a full tank of fuel, although some advocate an entire can into a tank!), then tapered off as things improved.

If, after several tanks of fuel, it's still the same, then it would be time to tear into it.

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Dusty Boots
Posts: 573
Joined: Mon Oct 26, 2009 4:25 pm
Location: Alvinston, SW ON
Motorcycle: 1992 GL1500Aspencade

Re: Idle up and down HELP

Postby Dusty Boots » Sat Mar 19, 2016 12:34 pm

spiralout wrote:Try running your idle adjustment out until the engine stalls then back in until it's around 850rpm.



Yes ... try the simple, inexpensive solutions 1st!

Open your fuel access door and with the bike running, adjust the idle speed adjustment knob back and forth so it changes your idle speed up and down. It will be stiff to move.
Once you have done that a couple of times, set the idle speed to +/- 800 RPM and then blip the throttle a few times and let it come to a steady idle again. Turn off bike and then start it up again to check idle speed. Adjust as needed!


warlock1954
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Re: Idle up and down HELP

Postby warlock1954 » Sat Mar 19, 2016 7:46 pm

pdqhil wrote:My 95 1500 is going up and down between around 700 rpm to 1000 rpm up and down other than that it runs great

Mine was doing the same thing. I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved. Might also consider this also.
David

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Charlie1Horse
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Location: Jacksonville, Florida
Motorcycle: 1986 GL1200A Aspencade 4Sale soon
1992 GL1500I Interstate

Re: Idle up and down HELP

Postby Charlie1Horse » Sat Mar 19, 2016 9:52 pm

Sometimes my 1500 would idle slower and other times a little faster. I replaced the spark plugs with OEM NGK plugs and after about a month it started running bad again. It would skip on one cylinder on normal take off and smooth out at speed. Replaced plugs again and the same thing happened about a month later. I ran half a can of Sea Foam with two consecutive fill ups and the problem went away. So now I add two ounces of Sea Foam with each fill up if it is near empty, which is most fill ups. If it is above half I don't add Sea Foam. But I haven't had a problem since I started this. I carry a can in the saddlebag at all times now.
Russell

Those who say it cannot be done should try not to interrupt those who are doing it.

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johnfliesagain
Posts: 48
Joined: Tue Jan 12, 2016 6:10 pm
Location: Baltimore, MD
Motorcycle: 2000 GL1500SE Anniversary Badge
Yamaha 79 XS750; 80 XS850
Picture of one of my Triples Yamaha xs750 '79 at Timonium Bike Show 2015

Re: Idle up and down HELP

Postby johnfliesagain » Sat Mar 19, 2016 9:56 pm

warlock1954 wrote:
pdqhil wrote:My 95 1500 ... I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved. Might also consider this also.
David


Using Partzilla, (for my 2000 se) I think I identified the tubing cited in the prior post as
17173-MN5-000 TUBE, PRESSURE BOOST still available $7.28

It as hows on their daigram "Tubing 2" as item 14.

Now could you help identify the sensor that you mention?

Thanks,
John in Baltimore
John in Baltimore
A proud owner of a 2000 1500SE
:D Did I mention it was a Free Gift from a co-worker?

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ct1500
Posts: 813
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Location: Glastonbury,CT
Motorcycle: 1988 GL1500
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Re: Idle up and down HELP

Postby ct1500 » Sun Mar 20, 2016 12:00 am

warlock1954 wrote:Mine was doing the same thing. I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved.
David


What exactly was the diagnostic routine/flow chart you followed to pinpoint the problem?
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

warlock1954
Posts: 48
Joined: Tue Dec 24, 2013 3:38 pm
Location: Magnolia, Ms
Motorcycle: 05 Goldwing

Re: Idle up and down HELP

Postby warlock1954 » Sun Mar 20, 2016 8:19 am

ct1500 wrote:
warlock1954 wrote:Mine was doing the same thing. I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved.
David


What exactly was the diagnostic routine/flow chart you followed to pinpoint the problem?

I had read another post, maybe here, describing what mine was doing. I had replaced all the vacuum lines, new plugs, checked the sync on the carbs. All was good. I noticed right before my fan would kick in the surge would go away, but would return once it cooled down.
David

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Bluewaterhooker0
Posts: 557
Joined: Wed Nov 14, 2012 11:27 pm
Location: Tampa, Fl
Motorcycle: 1997 Goldwing GL 1500 SE

Re: Idle up and down HELP

Postby Bluewaterhooker0 » Sun Mar 20, 2016 12:47 pm

Mh434 wrote:Personally, before tearing the bike apart, I'd try the Seafoam. I had an idle surging/rough idle situation (due to bad gas) and after several tanks of SF-treated fuel, it went back to normal - smooth, steady 850 RPM idle. Saved me from tearing the whole bike apart!

I used a fairly heavy application (1/2 can into a full tank of fuel, although some advocate an entire can into a tank!), then tapered off as things improved.

If, after several tanks of fuel, it's still the same, then it would be time to tear into it.


+1
I didn't dream up the Seafoam trick on my own. It was mentioned quite a bit on these pages by others. It works.

warlock1954
Posts: 48
Joined: Tue Dec 24, 2013 3:38 pm
Location: Magnolia, Ms
Motorcycle: 05 Goldwing

Re: Idle up and down HELP

Postby warlock1954 » Sun Mar 20, 2016 5:39 pm

johnfliesagain wrote:
warlock1954 wrote:
pdqhil wrote:My 95 1500 ... I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved. Might also consider this also.
David


Using Partzilla, (for my 2000 se) I think I identified the tubing cited in the prior post as
17173-MN5-000 TUBE, PRESSURE BOOST still available $7.28

It as hows on their daigram "Tubing 2" as item 14.

Now could you help identify the sensor that you mention?

Thanks,
John in Baltimore

Here you go.
http://www.goldwingfacts.com/forums/2-g ... olved.html
David

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Bluewaterhooker0
Posts: 557
Joined: Wed Nov 14, 2012 11:27 pm
Location: Tampa, Fl
Motorcycle: 1997 Goldwing GL 1500 SE

Re: Idle up and down HELP

Postby Bluewaterhooker0 » Mon Mar 21, 2016 5:02 pm

"warlock1954 My 95 1500 ... I traced it to the sensor on the intake manifold on the throttle side. Replaced it and problem solved. Might also consider this also."

Here you go.
http://www.goldwingfacts.com/forums/2-g ... olved.html
David[/quote][/quote]

I've seen that post before, but it seemed to address a slightly different problem.

"For the past 16 years I've specialized in Goldwing and Valkyrie repair and maintenance. I want to share something I've come across that's sort of an odd problem, and the fix for it.
Last year a local fellow brought his new-to-him Valk in. The problem was it surged at idle AND at highway speeds, and his fuel mileage sucked."

Most of the issues I've seen described were mild surge issues at idle only. I know mine was, and a simple Seafoam treatment solved the problem then, and has prevented a reoccurrence for the past 3 years.

warlock1954
Posts: 48
Joined: Tue Dec 24, 2013 3:38 pm
Location: Magnolia, Ms
Motorcycle: 05 Goldwing

Re: Idle up and down HELP

Postby warlock1954 » Mon Mar 21, 2016 9:22 pm

Glad it fixed yours. Mine wasn't that simple. The sensor fixed mine. It can be several different things that can cause the surge. Just trying to give different things it could be and might need to check. So all info to me is good stuff.
David




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