08 Ultra Classic Idle problem
Cruiser
Joined: Jan 2008
Posts: 216
Likes: 4
From: Rincon, GA
RE: 08 Ultra Classic Idle problem
Like I said earlier, mine did it until I had about 80 miles on the clock. It first dropped from 1800 to about 1300 or so and around the 100 mile mark it was idling at 1000-1100. Don't know why, just glad I didn't have to go see the dealer to get it correct.
Intermediate
Joined: Nov 2007
Posts: 29
Likes: 4
From: AZ
RE: 08 Ultra Classic Idle problem
The fact that KJC stated "If I turn the throttle away from me then the idle goes down to 1000 rpm" means that the bike does in fact need to relearn a proper zero for the twist grip. The phenomenon he is describing is not the warm up cycle. The ECM thinks he is holding the twist grip open slightly…even though his hand may be off the throttle. When he rolls the throttle away from him, the twist grip voltage goes below the learned zero and the ECM returns the throttle plate to the idle position.
I am not sure why it learned an improper zero, but it has, and cycling the power 4 times should correct the issue...at least temporarily...if there is another issue it will return later.
In case you are interested, the ECM records the twist grip voltage on both sensors at every key off…assuming it is in the proper range. It stores 4 values for each sensor. To determine the value to use for zero, it throws out the high and low values and averages the two remaining.
I am not sure why it learned an improper zero, but it has, and cycling the power 4 times should correct the issue...at least temporarily...if there is another issue it will return later.
In case you are interested, the ECM records the twist grip voltage on both sensors at every key off…assuming it is in the proper range. It stores 4 values for each sensor. To determine the value to use for zero, it throws out the high and low values and averages the two remaining.
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Novice
Joined: Nov 2004
Posts: 16
Likes: 1
From:
RE: 08 Ultra Classic Idle problem
ORIGINAL: Aggie
The fact that KJC stated "If I turn the throttle away from me then the idle goes down to 1000 rpm" means that the bike does in fact need to relearn a proper zero for the twist grip. The phenomenon he is describing is not the warm up cycle. The ECM thinks he is holding the twist grip open slightly…even though his hand may be off the throttle. When he rolls the throttle away from him, the twist grip voltage goes below the learned zero and the ECM returns the throttle plate to the idle position.
I am not sure why it learned an improper zero, but it has, and cycling the power 4 times should correct the issue...at least temporarily...if there is another issue it will return later.
In case you are interested, the ECM records the twist grip voltage on both sensors at every key off…assuming it is in the proper range. It stores 4 values for each sensor. To determine the value to use for zero, it throws out the high and low values and averages the two remaining.
The fact that KJC stated "If I turn the throttle away from me then the idle goes down to 1000 rpm" means that the bike does in fact need to relearn a proper zero for the twist grip. The phenomenon he is describing is not the warm up cycle. The ECM thinks he is holding the twist grip open slightly…even though his hand may be off the throttle. When he rolls the throttle away from him, the twist grip voltage goes below the learned zero and the ECM returns the throttle plate to the idle position.
I am not sure why it learned an improper zero, but it has, and cycling the power 4 times should correct the issue...at least temporarily...if there is another issue it will return later.
In case you are interested, the ECM records the twist grip voltage on both sensors at every key off…assuming it is in the proper range. It stores 4 values for each sensor. To determine the value to use for zero, it throws out the high and low values and averages the two remaining.
Intermediate
Joined: Nov 2007
Posts: 29
Likes: 4
From: AZ
RE: 08 Ultra Classic Idle problem
Electrical power. Make sure your run/stop switch is in the run position. Turn the main power on...wait 5 sec...turn off...wait 5 sec...repeat3 more times. This should be done with the twist grip in the idle position.
Thread Starter
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Novice
Joined: Nov 2004
Posts: 16
Likes: 1
From:
RE: 08 Ultra Classic Idle problem
ORIGINAL: Aggie
Electrical power. Make sure your run/stop switch is in the run position. Turn the main power on...wait 5 sec...turn off...wait 5 sec...repeat3 more times. This should be done with the twist grip in the idle position.
Electrical power. Make sure your run/stop switch is in the run position. Turn the main power on...wait 5 sec...turn off...wait 5 sec...repeat3 more times. This should be done with the twist grip in the idle position.
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