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fp3, fuel injection, fuelpak, stalling, vance and hines

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  #1  
Old 24th April 2017
StevenGlock StevenGlock is offline
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Default hiccuping/almost stalling while cruising

A few days ago I added the short shots, arlen ness big sucker AC, and used the vance and hines fuelpak fp3 to my 2013 iron 883 XL883N. I've only ridden it a few times since then, probably 3 hours total riding time.

When I'm between 30-40 miles per hour, the bike seems to hiccup, or almost stall if I let off the throttle a little bit, then it kicks back in and jerks the bike a bit. This all happens within a matter of a second. It is not smooth riding and all and doesn't make riding as fun as it should be.

I believe the map I used to adjust my AFR is causing this. I contacted vance and hines and they told me to run 1-2 tanks through it to see if it persists. I was also told the bike is still learning through the adaptive fuel values. Seems a little dangerous to me, especially if it happens in a curve. Should I just ride it out until it fixes itself, or should I get the bike remapped? Any input is appreciated.
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  #2  
Old 24th April 2017
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bustert bustert is offline
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the ecm if capable will adjust, i ride gravity so the hd system i do not have. i say this because some ecm's are very limited. there should be two sets of data, short term and long term corrections and by looking at the data, one can see what is going on. i think what is happening is the machine is going lean on the roll off and could be caused by the map, sensor skew or some ecm's when it sees at high vac or low pressure (how you look at it) will shut off fuel as it thinks it is coasting (saves fuel) until a base rpm is reached and it turns fuel back on for idle. i do not think it would take many tanks of fuel for this process to complete after all, this data is changing many times a second and the base map burn is only altered, not changed so if the base is off, then the learn is off if it is outside the learning curve.

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Old 25th April 2017
StevenGlock StevenGlock is offline
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Quote:
Originally Posted by bustert View Post
the ecm if capable will adjust, i ride gravity so the hd system i do not have. i say this because some ecm's are very limited. there should be two sets of data, short term and long term corrections and by looking at the data, one can see what is going on. i think what is happening is the machine is going lean on the roll off and could be caused by the map, sensor skew or some ecm's when it sees at high vac or low pressure (how you look at it) will shut off fuel as it thinks it is coasting (saves fuel) until a base rpm is reached and it turns fuel back on for idle. i do not think it would take many tanks of fuel for this process to complete after all, this data is changing many times a second and the base map burn is only altered, not changed so if the base is off, then the learn is off if it is outside the learning curve.


Sorry, I'm not very mechanically inclined, basically what you're saying is just wait and see if the data adjusts by itself? I think it is running lean when I let off the throttle. It does feel like the fuel completely shuts off for a second. The only thing that smooths it out is getting back on the throttle
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Old 25th April 2017
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only time will tell, i do not have hd ecm but in the auto world, the ecm adjusts quite rapidly.
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Old 25th April 2017
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Do you have any exhaust leaks or intake leaks? Everything tightened up and secured?

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Old 26th April 2017
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Originally Posted by Blue Scoot View Post
Do you have any exhaust leaks or intake leaks? Everything tightened up and secured?

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Nope. Both my dad (who is a mechanic) and I checked, no exhast leaks. How would I know if I had an intake leak?
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Old 26th April 2017
John Harper John Harper is offline
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Quote:
Originally Posted by StevenGlock View Post
How would I know if I had an intake leak?
Unless you took off the throttle body, or moved it up/down, you should not have a problem.

John
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Old 26th April 2017
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What gear are you in when this occurs at the 30-40 mph range?
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Old 26th April 2017
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Quote:
Originally Posted by StevenGlock View Post
Nope. Both my dad (who is a mechanic) and I checked, no exhast leaks. How would I know if I had an intake leak?
Use an unlit propane torch and listen for RPM change
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Old 26th April 2017
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Originally Posted by oldboy View Post
What gear are you in when this occurs at the 30-40 mph range?
It's really bad in second gear and it happens if I go under 40 in 3rd
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