Help troubleshooting low idle issue - please read and contribute
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Joined: Aug 2018
Posts: 66
Likes: 1
From: Illinois
2016 fxdb low idle
You leave out some very important details. Miles on I assume the 2006 Dyna. Lets think simple before we go complicated. These bikes are very reliable but like weedeaters are sensitive to things .
1.Are we talking a stock bike or all kind on mods and piggyback tuners? Forget my help
2. How long has this been going on and has bike been stored. Short time and stored. Replace all gas.
3.Maybe a load of fuel stabilizer or crud. First thing to go if the filter is crudded up is idle since ECM can not keep control of idle due to low fuel injector pressure. Check is rather complicated with out gages and connectors. Doing your own work and crud in tank. Just replace filter.
4. Once you crudely spray tons of carb cleaner crudely into throttle body or IAC passage way it washes black carbon deposits up into IAC linear motor past o-rings or TPS and in just a few days both are trashed due to sticking.
5. TPS is easy check with service manual and resistance meter. IAC is easy check key on and off and watch it after you read how it works and a little spray down passage way and see it come out hole at top just behind throttle plate.It is an air way--nothing more.
6.Throttle plate stop screw is just that and should never be adjusted. With throttle plate shut it should completely shut off throttle body. The stop screw keeps plate from digging into bore but a little carbon crude should stick plate. If it ever does, open butterfly and reach in with a sprayed cloth and wipe off and the lip of the plate. Has nothing to due with idle, just sticking.
7.Replace spark plugs just for good measure.
8.Ever pressure wash it or use tons of cleaners on it. Could be a bad electrical pin connector on IAC or TPS or the IAT (intake air sensor)
9.Does your battery have 12.6volts DC
Any of that help?
1.Are we talking a stock bike or all kind on mods and piggyback tuners? Forget my help
2. How long has this been going on and has bike been stored. Short time and stored. Replace all gas.
3.Maybe a load of fuel stabilizer or crud. First thing to go if the filter is crudded up is idle since ECM can not keep control of idle due to low fuel injector pressure. Check is rather complicated with out gages and connectors. Doing your own work and crud in tank. Just replace filter.
4. Once you crudely spray tons of carb cleaner crudely into throttle body or IAC passage way it washes black carbon deposits up into IAC linear motor past o-rings or TPS and in just a few days both are trashed due to sticking.
5. TPS is easy check with service manual and resistance meter. IAC is easy check key on and off and watch it after you read how it works and a little spray down passage way and see it come out hole at top just behind throttle plate.It is an air way--nothing more.
6.Throttle plate stop screw is just that and should never be adjusted. With throttle plate shut it should completely shut off throttle body. The stop screw keeps plate from digging into bore but a little carbon crude should stick plate. If it ever does, open butterfly and reach in with a sprayed cloth and wipe off and the lip of the plate. Has nothing to due with idle, just sticking.
7.Replace spark plugs just for good measure.
8.Ever pressure wash it or use tons of cleaners on it. Could be a bad electrical pin connector on IAC or TPS or the IAT (intake air sensor)
9.Does your battery have 12.6volts DC
Any of that help?
2016 FXDB
ISSUE- When coming to a stop, **** will drop to 750-850 for a couple seconds and fix itself as soon as I come to a COMPLETE stop. NO CODES.
What I have done-
Replaced IAC, TPS, Spark Plugs.
Cleaned Speed sensor and CSPS of any shavings.
Charging system I believe seems to check out.
I do not believe I have any vacuum leaks.
Bike was dyno tuned by previous owner 3 years ago and has always ran good. Although bike was not sold with tuner. (OLD SE TUNER)
I am basically stuck at what could be causing this issue and would like some input. I would rather fix myself instead and spending a bunch of money at the dealership.
Any ideas would be greatly appreciated.
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