Strange issue after applying custom tune
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Outstanding HDF Member
Joined: Dec 2010
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From: Temecula, CA
Strange issue after applying custom tune
So here's something that I just can't seem to figure out. Thought maybe someone on here might have an idea what might be causing this.
I have Vance and Hines Big Shots with a custom AC (see picture in sig) on my Dyna. I use a PowerVision with Autotune Pro to scan and tweak my tune. I installed the canned tune that FuelMoto included with the PowerVision and then ran the autotune a couple times to refine it.
The bike runs great. Cold starts it fires right up. It's restarting it when warm that's the problem like if I stop to get gas. When I go to restart it, it pops through the carb and doesn't want to start. Almost like the timing is off and/or it's got a ton of raw fuel in the cylinder when it isn't supposed to. If I twist the throttle once before I start it, no problems. If I try to start it and, after it protests, then twist the throttle once and try again, fires right up.
Also, the more miles I put on the bike, the worse the condition seems to get. This morning it really popped and banged whereas when I first put the most recent tune on it wouldn't do this at all. Almost seems like the fuel trims are flooding the engine when I come to an idle and shut the bike down. I don't get it.
Any of you guys have any thoughts on this?
I have Vance and Hines Big Shots with a custom AC (see picture in sig) on my Dyna. I use a PowerVision with Autotune Pro to scan and tweak my tune. I installed the canned tune that FuelMoto included with the PowerVision and then ran the autotune a couple times to refine it.
The bike runs great. Cold starts it fires right up. It's restarting it when warm that's the problem like if I stop to get gas. When I go to restart it, it pops through the carb and doesn't want to start. Almost like the timing is off and/or it's got a ton of raw fuel in the cylinder when it isn't supposed to. If I twist the throttle once before I start it, no problems. If I try to start it and, after it protests, then twist the throttle once and try again, fires right up.
Also, the more miles I put on the bike, the worse the condition seems to get. This morning it really popped and banged whereas when I first put the most recent tune on it wouldn't do this at all. Almost seems like the fuel trims are flooding the engine when I come to an idle and shut the bike down. I don't get it.
Any of you guys have any thoughts on this?
Ultimate HDF Member
Joined: Jul 2011
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From: New Braunfels, Texas
I'm guessing you can adjust the cold start on your Powervision. When I had my bike dyno'ld, after he was done, he let it get completely cold and had to adjust the cold start. Maybe its not getting enough choke?
I use the power vision and a FM custom tune. When I first loaded the tune it idled bad so I reloaded the tune and was sure to reset the trims and now it runs and starts perfectly so try resetting the trims.
Jon
Jon
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Outstanding HDF Member
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From: Temecula, CA
Cold starts are good but rooti, are you saying that I might be able to change the threshold as to what constitute "cold" starts? IE, change the temperature level of what "cold" is? If so I could definately play around with that, maybe lower that number so that it doesn't add more fuel to help the bike start if the bike is already past a certain temp.
wfojon, That's just it. When the tune is first loaded it's fine (trims are clear). The more I ride (thus the more the trims have "learned" the new tune) the worse the problem seems to get. I ALWAYS reset the trims when I upload a tune.
wfojon, That's just it. When the tune is first loaded it's fine (trims are clear). The more I ride (thus the more the trims have "learned" the new tune) the worse the problem seems to get. I ALWAYS reset the trims when I upload a tune.
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
So here's something that I just can't seem to figure out. Thought maybe someone on here might have an idea what might be causing this.
I have Vance and Hines Big Shots with a custom AC (see picture in sig) on my Dyna. I use a PowerVision with Autotune Pro to scan and tweak my tune. I installed the canned tune that FuelMoto included with the PowerVision and then ran the autotune a couple times to refine it.
The bike runs great. Cold starts it fires right up. It's restarting it when warm that's the problem like if I stop to get gas. When I go to restart it, it pops through the carb and doesn't want to start. Almost like the timing is off and/or it's got a ton of raw fuel in the cylinder when it isn't supposed to. If I twist the throttle once before I start it, no problems. If I try to start it and, after it protests, then twist the throttle once and try again, fires right up.
Also, the more miles I put on the bike, the worse the condition seems to get. This morning it really popped and banged whereas when I first put the most recent tune on it wouldn't do this at all. Almost seems like the fuel trims are flooding the engine when I come to an idle and shut the bike down. I don't get it.
Any of you guys have any thoughts on this?
I have Vance and Hines Big Shots with a custom AC (see picture in sig) on my Dyna. I use a PowerVision with Autotune Pro to scan and tweak my tune. I installed the canned tune that FuelMoto included with the PowerVision and then ran the autotune a couple times to refine it.
The bike runs great. Cold starts it fires right up. It's restarting it when warm that's the problem like if I stop to get gas. When I go to restart it, it pops through the carb and doesn't want to start. Almost like the timing is off and/or it's got a ton of raw fuel in the cylinder when it isn't supposed to. If I twist the throttle once before I start it, no problems. If I try to start it and, after it protests, then twist the throttle once and try again, fires right up.
Also, the more miles I put on the bike, the worse the condition seems to get. This morning it really popped and banged whereas when I first put the most recent tune on it wouldn't do this at all. Almost seems like the fuel trims are flooding the engine when I come to an idle and shut the bike down. I don't get it.
Any of you guys have any thoughts on this?
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Outstanding HDF Member
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From: Temecula, CA
No that's the odd thing. It is connected to the new tune as with the stock tune it doesn't do this. It didn't happen as soon as I put the tune on the bike, it started up after a few weeks. Then it gets progressively worse. This is what leads me to thinking it's a fuel trim issue.
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Ultimate HDF Member
Joined: Jul 2011
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From: New Braunfels, Texas
I would post the question on the sticky thread in the Powervison tuning section.
There are much knowledgeable people then me there. It does sound like it's a simple adjustment.
Just search, powervision tuning sticky and it will pop right up
There are much knowledgeable people then me there. It does sound like it's a simple adjustment.
Just search, powervision tuning sticky and it will pop right up
Last edited by rooti; Nov 29, 2012 at 04:22 PM.
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