Not Firing On All 4


Information and questions on GL1100 Goldwings (1980-1983)
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aznyaz
Posts: 245
Joined: Sun Jul 29, 2012 12:36 pm
Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Not Firing On All 4

Postby aznyaz » Wed Nov 07, 2012 11:12 am



It appears that my #2 cylinder may be firing intermittently or not at all. Is there a definative test to determine this?



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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: Not Firing On All 4

Postby virgilmobile » Wed Nov 07, 2012 11:38 am

Some testing methods...
8 second idle from cold...lightly tap each header....cold= dead....warm=a firing cylinder.All should be equal temp.
compression test....open throttle...no more than 5psi or so difference between cylinders.Expect to see 125psi and up.Below 100psi has a hard time firing.
Spark plug inspection....The condition of each plug can indicate how the cylinder is firing...There are posts on how to "read" your plugs.
Damp ignition test....remove the rubber block that joins the plug pair and run the engine while dark...mist some water over the ignition wiring and watch for sparking....A deteriorated wire or cap can "leak" the spark out of it and cause a mis-fire.
If all is OK,tend to the carbs and fuel system.

Spark,compression and fuel/air mixture....that's about it.

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aznyaz
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Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Re: Not Firing On All 4

Postby aznyaz » Wed Nov 07, 2012 12:08 pm

I tried touching the header and it gets warm and hot to the touch after running a few minutes but not as hot as the others, so that tells me something is happening. I'll give the other tests a try. Is there any harm in riding the bike while one cylinder is dead or not working as good as the others?

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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: Not Firing On All 4

Postby virgilmobile » Wed Nov 07, 2012 12:22 pm

No harm that I'm aware of.just be aware of the lack of power that is avaiable.

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aznyaz
Posts: 245
Joined: Sun Jul 29, 2012 12:36 pm
Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Re: Not Firing On All 4

Postby aznyaz » Wed Nov 07, 2012 12:32 pm

That's what's curious about my situation. It seems to have decent power, but then I really don't have anything to compare to. I can move along just fine on the interstate and it sounds like all are firing. I seem to get the same pulsations out of the left tail pipe as I do out the right.

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ram11397
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Location: Westerly, Rhode Island
Motorcycle: 1982 GL1100A Aspencade

Re: Not Firing On All 4

Postby ram11397 » Sat Nov 10, 2012 11:13 pm

Hi,
I had this problem and it turned out i had to have the pulse generator replaced. I tried everything else until a friend say maybe electrical/ignition issue i tested everything i could thing of then i was looking thur the manual chapter 15 sub 15-5 showing the test for it and mine failed the test. after replacing fired on all 4 i goes like bat out of hell ,and i thought it was running great before I discovered it was running on only 3 I was changing plugs and noticed #2 was still like new. Not sure if this helps

Rick
Rick
1982 GL 1100 Aspencade

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aznyaz
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Joined: Sun Jul 29, 2012 12:36 pm
Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Re: Not Firing On All 4

Postby aznyaz » Sun Nov 11, 2012 7:38 am

All information helps. Thanks for posting. Mine seems to run OK except for the sputtering that I'm experiencing, and it seems to have plenty of power. I took it to the mechanic yesterday and he seemed to think it was carb related. Do you know if the pulse generator is prone to failure with age or mileage? Mine's an '81 with only 16,000 miles on it.

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aznyaz
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Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Re: Not Firing On All 4

Postby aznyaz » Sun Nov 11, 2012 11:12 am

I read through that section and was wondering if I need to check the coil as well, and also need to know what a coil tester is. I will try the other procedures as time permits so I can open the bike up and get familiar with the layout (the pictures in the service manual I downloaded aren't very clear). I would think too, that I will need to check the spark units as well, right?

harmdeboer
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Motorcycle: 1985 gl1200ltd

Re: Not Firing On All 4

Postby harmdeboer » Mon Nov 12, 2012 7:25 am

start with the sparkplugs.
then the coil and the leeds.

if that does not help check iff there is feul flow...

no feul (on idle cloged carbs) no combustion... no heat...

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aznyaz
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Re: Not Firing On All 4

Postby aznyaz » Sun Nov 18, 2012 1:36 pm

OK, so I checked for spark (don't know why I waited so long to do this, it was pretty simple) and I have spark at #2 plug wire. Now, I didn't check the plug since it's virtually brand new, but I'll pull it out see how it's working. So, I'm thinking it's a an issue with the #2 carb. The other 3 seem to be working fine as all cylinders are firing. Since the #2 carb seems to be the issue, would it cheaper/less work to take that one off or have it worked on separately,or go get the entire re-build done?

harmdeboer
Posts: 14
Joined: Thu Apr 14, 2011 3:45 pm
Location: Netherlands
Motorcycle: 1985 gl1200ltd

Re: Not Firing On All 4

Postby harmdeboer » Sun Nov 18, 2012 1:51 pm

so all 4 fire but there is no/poor feul flow on number 2?

did you ever synchronize your carbs



have you tried using a feul adative to clean the feul system? cheap and easy

if it does not work you van always consider having your carbs cleaned.

i suggest iff you work on your carbs have them all done if 1 is cloged the other wil be spoiled as wel. So that they may cause a problem in the near future. better save than sorry have them cleaned an syncronised so it works as it is supposed to...

good luck and keep us informed.

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aznyaz
Posts: 245
Joined: Sun Jul 29, 2012 12:36 pm
Location: Knoxville, Tennessee
Motorcycle: 1981 GL1100I

Re: Not Firing On All 4

Postby aznyaz » Sun Nov 18, 2012 2:08 pm

I have not sync'd them myself, I can only assume the mechanic I got the bike from did some rudimentary carb work which may or may not have including syncing. I've run several cans of Sea Foam thru which may have imporved perfomance of the 3 good carbs but did not have any effect on #2. I will probably take the carb assembly off this winter and have my local carb re-builder do his thing, unless I could take #2 carb off and tinker with it or have someone just unclog it.




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