2009 Road King loosing most engine power - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 11-28-2012, 06:59 PM   #1 (permalink)
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2009 Road King loosing most engine power

I have a 2009 Harley Road King. It has the 1584cc motor and has a Screaming Eagle kit in it however I don't know which stage. Recently I have been having a problem where the engine seems like it is only running on one cylinder. It stays running and the throttle has very little effect on the engine speed. It has done this on initial start up and just going down the road. It usually takes between 3 and 5 restarts then runs fine. When it happens the engine light does come on but goes off when it starts properly. I did have the throttle sensor replaced a few months ago. Anyone have any ideas on what I am looking at that is wrong?
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Old 11-28-2012, 07:00 PM   #2 (permalink)
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Limp mode. Check for codes. Something is causing the ecu to go into protect mode.
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Old 11-28-2012, 07:15 PM   #3 (permalink)
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limp knodes.....
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Old 11-28-2012, 07:31 PM   #4 (permalink)
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Okay I guess I will have to take it in to the shop to get the codes ran then.
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Old 11-28-2012, 07:35 PM   #5 (permalink)
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Originally Posted by ghostrider2012 View Post
Okay I guess I will have to take it in to the shop to get the codes ran then.
You don't need to go to the dealer. Read the sticky in the electrical section here under DTC codes and find them your self. You need to find the throttle actuator plug on the left (rear) of the throttle body and clean and inspect the pins and check the wiring for damage. Add a dab of dielectric grease in it as well. It could be the actuator sensor connection or else you have another throttle by wire sensor going bad. Check the codes first.

It may have been the actuator connection or a bad pin/wire all along......
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Old 11-28-2012, 07:40 PM   #6 (permalink)
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Okay I have to work tomorrow but will check that out on Friday. Thanks. This is my first Harley I've had it a year but still learning.

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Old 11-28-2012, 07:47 PM   #7 (permalink)
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Read this...

2009 Ultra - 'limp home' mode
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Old 11-28-2012, 07:58 PM   #8 (permalink)
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Thanks....ill try all that out and see what happens.

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Old 11-29-2012, 08:52 PM   #9 (permalink)
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Okay ran the codes and came up with only one code.

P1511
Which under the code list states: Throttle actuator control limited performance.

Any ideas? Like I said i'm new to Harleys and still learning.


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Old 11-29-2012, 10:18 PM   #10 (permalink)
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Originally Posted by ghostrider2012 View Post
Okay ran the codes and came up with only one code.

P1511
Which under the code list states: Throttle actuator control limited performance.

Any ideas? Like I said i'm new to Harleys and still learning.


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TBW sensor is out of whack and needs to be checked out/replaced.

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