Has anyone cured the cold stumble?
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Has anyone cured the cold stumble?
Teach , I've never had it. I've heard others talk about it. I do have the Guhl flash but rode it three years before that. I mostly run Shell 93. Not trying to start that debate. If you haven't run any Lucas or Seafoam in the bike you might try that. I believe it's caused by a lean condition. A good cleaner might help. With your mileage have you had a set of plugs installed?
I haven't had new plugs. My mechanic thinks it's the fuel pump and they are replacing the fuel pump under warranty. (I don't think it's the fuel pump, but WTH, let them replace the fuel pump)
I've tried Seafoam.
Right now, I have to let her warm up to operating temp or else I get the stumble.
I think new plugs helped Isleen's stumble, but it's still there.
I'm getting an ECM to Guhl soon - too much performance going to waste in the name of the EPA.
While I'm waiting/getting the reflash, I'm going to run a full can of seafoam in the next 3 tankfuls just to ensure her pipes are clean.
It's embarrassing riding out of the driveway and have the bike buck and hiccup.....
On my 13 I learned to start the bike, zip the jacket, put the helmet on, put the gloves on and at under 40-45* plug in the heated gear. The bike was sufficient to ride with some care. My 14 doesn’t have the cold stumble but does have an high idle for a short time. Longer when bellow 45-50*. I know, it’s not really a fix. My 13 had not so nice sounds coming from the clutch/ transmission at any temperature bellow 50* until it reached operating temperature.
Stumble? guess I don't have one, 'cause I'm not sure what it is. I get a bit higher rev when I first start my bike, after a minute or 2 it's down to normal.
Okay, I'm with you....but I'm still missing something (probably VERY basic):
Let's say that the motor requires "x" amount of fuel when at idle cold, and let's say needs "x/2" when idle warm.
When I crack the throttle at cold to get going - let's say that requires "2*x" of fuel - the motor hiccups almost to the point of stalling, regardless of clutch lever position.
If this was a screen or filter issue, would it then make sense that 'anytime' - warm or cold - I needed "2*x" amount of fuel the motor would at least burp?
Again, I am NOT being willfully ignorant here, I am just not getting it.
Thanks,
Steve
I have the stumble.
I just let it warm up or give it a bit more gas/feather the clutch for a split second when I take off cold.
Until someone mentions it,I do not notice it.
As far as it being a filter or screen issue,I don't think it has anything to do with that.
Here is why.
There appears to be more Goldwings/F6Bs with the stumble than don't have it.
Every one of them has different miles on them.
I don't believe all of these bikes can have a filter/screen issue.
On a side note...the stumble as it is called has never caused a concern for me.
I just ride.:)
I'm not saying that's it Steve. Just supposition. A cold engine can require twice as much fuel as a warm engine. That's why it goes away when it warms up. It could be in the programming in the ECU. Lots of could be all over the place. There is only one constant. It's short on fuel when cold.
"It's short on fuel when cold"
That is a fact.
I am in FULL agreement that there is a fuel flow issue.
But is it one or all of the following:
Electrical
- The demand signal
- The demand signal feedback loop
- A sensor somewhere giving false information
Mechanical
- The fuel pump not responding to the demand flow (main jet / pilot jet issue??? lol )
- A filter
- Mechanical feedback in the throttle body
I believe it's in the ECU - no one with a Guhl reflash has had this problem.
Can't wait to get mine to him and back.
I also want to see if GaTeach's mech had the solution.
Steve I do know a couple guys on another forum that still had a problem. Sent the ECU back to Guhl a second time and no issues after that. If it was me I would tell Don about the problem so he could pay special attention to that area.
Steve,
I believe also it is in the ECU...Fuel injection has a cold start circuit. That is controlled through the ECM of whatever vehicle it is.
Cold start stumbles, typically are a result of misinformation being sent (sensor) to the ECM. Hence the ECM will produce a lean condition.
Sensors are hard to diag. as they have gremlins and we all know how hard they are to catch...
Has anyone had a code thrown due to the stumble??
On a side note , you get that flash you better hang on in first and second. It ain't the same bike.
There is a guy on a GL forum that had to have his reflashed 3 times I believe he said before it took care of it.
I have learned to live with this minor issue..Start the bike, put on helmet and other gear wait a few seconds then back down my driveway slowly, take it a little easy getting out my sub and by the time I get to the main roads I am generally good to go....No big deal after 4 or so years now....Ride safe
Opas I think the problem is some people have it lot worse than others. I think Teach could ride a carbureated mule but she has problems with that B when it's cold. It's not if you can but rather should you have to. The answer to that is no. You have the right to expect your bike to perform properly. And if the problem is bad enough it can be a hazard.
There are a few fixes that some owners have had luck with. NGK plugs were supposed to help.
Flashing is the only real way to go.
Mine does it but I know how to use the throttle to get past it. Just be aware of it and don't goose it while its cold.
Mine also has a high idle while its cold. All my cars do as well. Normal for injected motors.
And the noise coming from the clutch while its in neutral, the service man says he's herd worse.
I could go on but that takes away from my riding time.
I guess when things like this are out there.....it's enough of an issue.
http://electricalconnection.com/inde...-stumble-stop/
Cheers,
Steve
I also have the cold stumble. It is annoying, but only lasts for about 30 seconds, thank goodness, between 1/3 of the way to normal and 2/3 of the way to normal temp.
Be careful with the gas when making turns during the stumble.;)
I've been using the Boosterplug for a couple years. It does work!
https://www.boosterplug.com/shop/hon...ries-53c1.html
I had my 13 dynoded and the tec told me that the bike ran very lean.
That there are TWO aftermarket products, plus the Guhl reflash, to fix this nonsense, tells me that Honda engineering needs to be rectified.
Unfortunately, it also tells me that Sweet Georgia will be getting a free fuel pump for no apparent reason - although I could be VERY, VERY wrong.
Teach it never hurts. A nice new pump is peace of mind.
That tricks the ECM in thinking the air temperature is cooler/denser than it really is and enriching the fuel ratio. Simple cheap resistor on the air temperature sensor. The other simple way would be to put a resistor on the oxygen sensor to trick the ECM to think the outgoing exhaust is too lean so the ECM adds more fuel to enrichen the air/fuel ratio.
I added fuel injector cleaner to a tank of fuel and my stumble disappeared. Next fill up will be with ethanol free gas.