engine idle drops when put into gear, is it normal?


Information and questions on GL1500 Goldwings (1988-2000)
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WmHayes
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engine idle drops when put into gear, is it normal?

Postby WmHayes » Thu Sep 24, 2015 9:03 am



Hello, I have a 1990 Gl 1500 SE , It's my first full dressed bike, well my question is is it normal to have the idle drop when I put the bike into gear ? The idle drops maybe 200 rpm's and the bike is kind of doggy starting out from a dead stop. Is this normal. Thank you .



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Re: engine idle drops when put into gear, is it normal?

Postby WingAdmin » Thu Sep 24, 2015 9:12 am

WmHayes wrote:Hello, I have a 1990 Gl 1500 SE , It's my first full dressed bike, well my question is is it normal to have the idle drop when I put the bike into gear ? The idle drops maybe 200 rpm's and the bike is kind of doggy starting out from a dead stop. Is this normal. Thank you .


I wonder if the clutch is dragging a little bit?

Does it do it more when the engine is cold than when the engine is warm?

When the bike is on the center stand with the engine running, if you put it into gear but hold the clutch in, does the rear wheel turn? If so, can you easily stop the wheel with your foot?

WmHayes
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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Thu Sep 24, 2015 9:50 am

It's exactly the same ice cold or hot, the rear tire doesn't turn when on the stand and in gear, with the clutch pulled in. I had never imagined that the idle would drop because it is in gear, it is also like the timing had been retarded ? I'm not sure at this point, it runs very nice and strong I get 44 mpg on the interstate, The previous owner had lied about doing all kinds of work on the bike and he said it is normal for this to drop when put into gear. So I am very skeptical on this issue, any other ideas? Thaks for your time....

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virgilmobile
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Re: engine idle drops when put into gear, is it normal?

Postby virgilmobile » Thu Sep 24, 2015 11:03 am

3 questions.
Where does your clutch lever start to move the bike,eg,engaging the clutch and what is the idle RPM your set at in neutral.
Does this drop happen if you select another gear other than 1st..

WmHayes
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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Thu Sep 24, 2015 2:11 pm

The clutch is approximately halfway, and when I let it all the way out the idle is stil, low, I currently have the idle set at 900 rpm's and it drops down to 650 to 700 rpm's, it happens in all gears, our local Honda shop is baffled too, the person who I had bought the bike from said it's normal for Goldwings to do this, it is vaccum controlled? I am a ASE certified Auto mechanic and I am still scratching my head. There is no resistance on the rear wheel when in gear with the clutch pulled in. Any ideas? Thanks. Bill H..

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Re: engine idle drops when put into gear, is it normal?

Postby WingAdmin » Thu Sep 24, 2015 3:13 pm

There is no control by the ECU to change idle speed based on gear position sensor. I'm sure this is entirely mechanical.

You can confirm this by unplugging the gear position sensor, and seeing if the behavior remains. The ECU will have no idea what gear the bike is in. If you like, you can jumper the connector so that it thinks it is still in neutral when you shift it into gear. I suspect the RPM will still drop.

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virgilmobile
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Re: engine idle drops when put into gear, is it normal?

Postby virgilmobile » Thu Sep 24, 2015 3:26 pm

Sense everybody is baffled,you will be the first to solve this.
I've not heard of any wing that drops idle as soon as a gear is selected.
Now to address he burning question.
Keep in mind that mine is a 88 and there are a few differences but I do know that the ignition timing does shift when I select3rd, 4th and 5th gear.The ignition module does monitor gear selection on mine and does change the timing.

If you could get to the plug that comes from the gear selector switch in the front of the bike and unplug it you can test this.
You would loose the neutral lamp and have to start it with the clutch lever.
Put it in gear and see if it still drops.
There may be a relation.Gear selection ties into my carb control module and ignition control module as I recall.
On the 88 it does not monitor 1st or 2nd gears...perhaps your model does.
It may not be related to mechanical at all but a control system.

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Re: engine idle drops when put into gear, is it normal?

Postby virgilmobile » Thu Sep 24, 2015 3:37 pm

Ok...I just saw a schematic for a 93.
The gearshift sensor(switch) does in fact tie to the ignition module...However it has NO connection for first gear...
Soooo...cancel my previous ideas...
Go with the admins about unplugging it and grounding the light green/red neutral wire to make the system think its still in neutral.
This one test will at least seperate your problem to either mechanical or some computer controll trouble.

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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Thu Sep 24, 2015 3:48 pm

Thank you all for the help, I do agree that I will be the one to figure this out, I will remove the gear select plug, and give this a try, I'm hoping this will not be like owning a old vw bug, that's all you do is fix them, anywhere and everywhere. .. I really do enjoy riding this 2 wheeled Cadillac. Way better than any of my H/ D's oh one thing, if the idle doesn't change after removing the nutrial switch it's in the computer...?
I just saw you note Virgilmobil, I will try that, and go from there, thanks for your time and help, I really do appreciate it. Bill H.

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Re: engine idle drops when put into gear, is it normal?

Postby virgilmobile » Thu Sep 24, 2015 3:51 pm

Just so were all on the same page,were trying to seperate mechanical from electrical by making the bike think its still in neutral by unplugging the switch and grounding the neutral wire.it must be unplugged for this test.

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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Thu Sep 24, 2015 4:05 pm

Yes were on the same page, and I do understand what to do next, I wil, be doing this tonight, and I will let you know how it went. Thanks again, Bill H.

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Re: engine idle drops when put into gear, is it normal?

Postby ct1500 » Fri Sep 25, 2015 8:15 pm

Does the bike have a Compufire alternator? I bet once you start tearing into this machine it will be obvious someone has been into it previously and left things unconnected, hooked up wrong or substituted incorrect parts.

I would get the idle down to where it is supposed to be at 800 RPM and start diagnosing if rich-lean or other along with power balance testing both in gear and out. The bike should not be doggy out of the hole and is most likely caused by a lean condition that could be caused by the shot air or air jet controller systems which can conceivably cause the idle drop issue by an introduced vacuum leak. A properly running 1500 will be able to idle all the way down to 400-450 RPM's before stalling. If you think ign timing is out put a light on it.

When dealing with the unknown nothing can be dismissed until verified and that includes checking cam timing as a piece to the puzzle presented.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Fri Sep 25, 2015 10:56 pm

Hello everyone, I had just spent the last 24 hours working on this bike, I hqad assumed since I bought it that she hzd a vaccum leak, I had removed the carb, cleand and did a kit, and while I was there I hsd removed the black material from under the carb, and the is a lot of hoses under there, well behold there was my problem a vaccum hose that goes from the left intake to the right intake just under each of the carbs
The hose had a suction hole one each end. I replaced it and checked all the others and replaced all the marginal one to. I really don't want to strip this bike back down any time soon. Just came back from a hour ride and everything works absolutely perfect ! Thanks to everyone who took the time to help me out, Bill H.

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ct1500
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Re: engine idle drops when put into gear, is it normal?

Postby ct1500 » Sat Sep 26, 2015 3:53 am

That hose is a common vacuum leak point causing the lean mixture condition and glad the problem wasn't more difficult to deal with.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

WmHayes
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Re: engine idle drops when put into gear, is it normal?

Postby WmHayes » Sat Sep 26, 2015 6:39 pm

So glad that's all, I just got back from a 234 mile road trip today, she ran awesome, I have my baby now, thanks to everybody who took the time to help me out with this issue. .... Bill Hayes

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Re: engine idle drops when put into gear, is it normal?

Postby revtmuller1 » Sun Sep 27, 2015 12:19 pm

Thanks for posting the solution and outcome of this problem. So many times we don't get to hear the solution to problems that are posted. Glad for a good ending :-)




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