1500 intermittent cylinders not firing


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iflysmodel
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1500 intermittent cylinders not firing

Postby iflysmodel » Mon Aug 15, 2016 9:19 am



Hey Guys &Gals, I have an intermittent problem with one or two cylinders not firing. Of course, when I look at the trouble shooting guide that sort of thing is not covered. When I have taken it to the dealer (on a trailer) it always runs on 6 cylinders. It seems like there is either an intermittent fuel or electrical problem. My first thought was a spark plug gone bad. I replaced all the plugs, it started & ran great for about 15 minutes then proceeded to miss on one cylinder. When I went to start it to load it on the trailer it ran on 4 then finally 5 cylinders. When I got to the dealer (45 miles) it ran on 6 cylinders. After bringing it home and filling the fuel tank, 5 days later, when I went to start it, it only runs on 5 cylinders. Take it back to the dealer (on trailer) and sure enough it runs on 6 cylinders . UGH!!
Got any great ideas, or has anyone had the same sort of problem before?
Lynn



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WingAdmin
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Re: 1500 intermittent cylinders not firing

Postby WingAdmin » Thu Aug 25, 2016 6:34 pm

Any difference in the environment when it happens? Humidity/rain? Heat? Is the engine warm or cold when it happens?

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FM-USA
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Re: 1500 intermittent cylinders not firing

Postby FM-USA » Thu Aug 25, 2016 9:53 pm

LOOoong story made short.

I remember a neighbor who secretly installed a remote control on his neighbors Volkswagon.
Every time he started that bug it ran on fewer cylinders. He looked over the motor and couldn't find the problem so he took it into the shop. At the shop the other neighbor was secretly making the bug run on all 6 cylinders.
On the second trip to the shop the bug owner noticed his neighbor following him. At he shop he lay in wait and caught him red handed working the remote.

Fake story you say? LOL, nope, was my neighbor 2 doors over having fun with his next door new neighbor. New neighbor tried claiming part of next doors front yard property through survey post manipulating after midnight. :lol:
MORAL:
You don't mess with race car builders, they got lots of FUN toys.

SO, Lynn... you good with your neighbors? :twisted:
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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iflysmodel
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Re: 1500 intermittent cylinders not firing

Postby iflysmodel » Fri Aug 26, 2016 4:33 am

No. No difference in environment first time it happened was on a ride home from dealer.& one cylinder quit after 15 minutes. Came on line twice for a few seconds once or twice during the next 10 minutes of getting the bike home. Next time it went to 5 after warm up & 10 minutes of riding. Next time it would only start on 4, then ran on 5 after a minute or two. Would not run on 6 until after a 45 mile trailer ride to dealer. Then ran like new. It has got me stumped.
No neighbor problem Ha Ha!
Lynn

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FM-USA
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MADE_IT!_200K_Oct_17/2016
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Re: 1500 intermittent cylinders not firing

Postby FM-USA » Fri Aug 26, 2016 7:04 am

Your problem sure sounds electrical since it's only one or two plugs misfiring.

Check the ends of the spark plug wires for possible corrosion or missing wire core. If it looks good do an Ohms test from the plugs end to the coil. You'll have to use a pin to pierce that wire. You can use a sealant on that very small hole to not let moisture in.
It's also possible to have a poorly grounded or cracked coil.
If it's all good, next it could be a vacuum leak. But that's doubtful since even the slightest fuel air mixture will fire randomly, your description sounds like it's a continuous miss.

IF i were betting, I'd bet it's a coil.

.
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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RBGERSON
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had every year from 75 to 83

Re: 1500 intermittent cylinders not firing

Postby RBGERSON » Fri Aug 26, 2016 8:29 am

Which cylinders..bad coil would always take out two opposing cylinders..
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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iflysmodel
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Re: 1500 intermittent cylinders not firing

Postby iflysmodel » Fri Aug 26, 2016 5:40 pm

I also suspect it is electrical. I do not know which cylinder/(s) stop firing. I suspect corrosion in one or more electrical plugs. I originally had a problem where the bike would not start. It cranked fine, but seemed to have either no ignition or no fuel. Trouble shooting led me to the control module ( which by the way is no longer available) but replacing the module with a good used one did not fix the problem. When I discussed it with my Honda dealer & mechanic they suggested I bring it for a thorough check out to determine what the problem really was. They found corrosion in an electrical plug ( I do not remember which one) cleaned it and the bike started. It ran fine until about 1/2 way home
when this new problem occurred.
because it only acts up intermittently it is a tough one.

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FM-USA
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'91 GL1500-I (Dbl-Darkside)
Acquired:__51K_Jun_??/2007
MADE_IT!_200K_Oct_17/2016
iRide 24/365 99% SmileMiles
================
"You don't buy yourself a
HD to be SATISFIED,...
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HD friends PACIFIED."
================
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Re: 1500 intermittent cylinders not firing

Postby FM-USA » Fri Aug 26, 2016 7:04 pm

Do a cold start, run for 8 - 10 seconds, shut off, touch each exhaust pipe near the motor.
Hopefully it'll cooperate and miss fire when you're doing this.

This maybe a "Palm Tree" mechanics way of testing it... costs nothing. :)
Last edited by FM-USA on Fri Aug 26, 2016 9:12 pm, edited 2 times in total.
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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ct1500
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Re: 1500 intermittent cylinders not firing

Postby ct1500 » Fri Aug 26, 2016 7:45 pm

The ignition systems on the 1500 are pretty much bullet proof with no known problems. It would take the best of the best mechanic to know how many cylinders were not firing at a given time and to distinguish an ignition system malfunction from a stuck slide scenario e.g. which will cause cylinders to drop out to varying degrees.

It takes diagnostic tests with all plastic components removed to narrow down a problem area, anything less is just guess work. Carburetor, fuel and emission related systems are far more likely to give driveability problems than ignition on the 1500.
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

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FM-USA
Posts: 2008
Joined: Wed May 18, 2011 8:40 am
Location: USA-ILL-60085
Motorcycle: .
'91 GL1500-I (Dbl-Darkside)
Acquired:__51K_Jun_??/2007
MADE_IT!_200K_Oct_17/2016
iRide 24/365 99% SmileMiles
================
"You don't buy yourself a
HD to be SATISFIED,...
you buy it to keep your
HD friends PACIFIED."
================
|
ANTAGONISTS need not post.
|
==================

Re: 1500 intermittent cylinders not firing

Postby FM-USA » Sat Aug 27, 2016 5:14 am

Well iflysmodel, you'll find the problem soon.
"OIL CHANGE?" _FM 07-2009
Know its new taste and be loyal, you'll know when to change that oil.
Taste testing as the miles flow, souring as that acid grows.
And don't flirt with dirt or darkened oil, all the faster your engine will spoil.

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robb
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Re: 1500 intermittent cylinders not firing

Postby robb » Sat Aug 27, 2016 9:05 am

It is possible for a bad coil to drop 1 cylinder then complete failure will drop 2 cylinders.
1-2 , 3-4 , 5-6. Check if lost cylinders are from matching coil.




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