09 Ultra
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Novice
Joined: Oct 2016
Posts: 22
Likes: 1
From: North East Tennessee
09 Ultra
Looking for some thoughts/ideas. My scoot is experiencing fluctuating idle. When cold started it will idle at about 1500 rpms and bounce between that and 1000 rpms. once it warms up it will bounce between 12 and 9 hundred.... It has 12k miles and runs great on the open road. Mods are A/M mufflers and exieds on the O2 sensors. It did the same thing before the exieds.
Should I see about getting the ECM flashed? Clean the throttle body? Its almost like it has a small vacuum leak but I don't know.
Help!
Should I see about getting the ECM flashed? Clean the throttle body? Its almost like it has a small vacuum leak but I don't know.
Help!
Club Member
Joined: Apr 2013
Posts: 5,769
Likes: 3,766
From: Cape Cod
try cleaning the IAC....oil from the breather system is routed back into air cleaner and then sucked in to throttle body........chit gets dirty in there.........take off air cleaner.........stuff a shop rag in throttle body so chit doesn't go into engine........IAC is that hole at the 12 oclock position just inside throttle body.......user a cleaner with one of those straws.......what you are goin to do it have IGN ON......NOT running.........while spraying UP in to IAC toggle the KILL SWITCH off and on.....you'll see a bunch of oily crap in the rag.......keep going until now more chit.......check operation of IAC by sticking finger up in to hole while toggling KILL SWITCH .....should move freely..........good luck.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
The 08 and 09 can benefit from resetting the throttle position sensor:
put your left hand in your pocket.
with the kill switch to run...
turn on the ignition switch with your RIGHT hand...let the fuel pump prime and stop...turn off ignition ( with right hand).
repeat this 3 more times
this will reset the TPS to the ECM.
if we use the kill switch to stop the motor, we often give the tps input as we hit the switch.
try to get in the habit of using rt hand on ignition switch to shut down..
2.) the xieds may need an added ground wire, steve mullen ( nightrider) is aware of this and can offer help. I added ground wires on mine and that did solve a funny little idle problem which seemed to come and go.
the rear ground wire I attached behind the starter end cover, the front I attached under the voltage regulator mount
Mike
put your left hand in your pocket.
with the kill switch to run...
turn on the ignition switch with your RIGHT hand...let the fuel pump prime and stop...turn off ignition ( with right hand).
repeat this 3 more times
this will reset the TPS to the ECM.
if we use the kill switch to stop the motor, we often give the tps input as we hit the switch.
try to get in the habit of using rt hand on ignition switch to shut down..
2.) the xieds may need an added ground wire, steve mullen ( nightrider) is aware of this and can offer help. I added ground wires on mine and that did solve a funny little idle problem which seemed to come and go.
the rear ground wire I attached behind the starter end cover, the front I attached under the voltage regulator mount
Mike
Last edited by mkguitar; Jan 27, 2017 at 05:35 PM.
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Novice
Joined: Oct 2016
Posts: 22
Likes: 1
From: North East Tennessee
I understand what you are saying about the kill switch, but the manual says not to use the ignition switch to shut down the engine but to use the kill switch. Or did I read that wrong?
I will try to reset the TPS and see if that helps any. Thanks for the input.
I will try to reset the TPS and see if that helps any. Thanks for the input.
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Ultimate HDF Member
Joined: Mar 2012
Posts: 6,129
Likes: 143
From: Santa Cruz
'09s did have issues with throttle control modules. Not sure it is you're problem?? May try cleaning the pins/connector on the module too.
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