1998 Road King
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6th Gear
Joined: Nov 2017
Posts: 10
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From: Louisiana
1998 Road King
I've recently acquired a '98 Road King. I love the bike but when I give her more than half the throttle she chokes down and tries to die. She's idling fine and runs great on a gradual speed increase but if you try to goose it at all she chokes out like she's running out of fuel. Any ideas guys?
Seasoned HDF Member
Joined: Jun 2006
Posts: 28,473
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From: Vermont
My bad, just assumed it was a carb model. It is definitely starving for fuel. The fuel filter will be inside the tank under the console where the fuel pump is. The regulator is located in the fuel injection assembly should it be that as well.
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Joined: Jun 2007
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From: Bedford UK
Seasoned HDF Member
Joined: Oct 2007
Posts: 8,852
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From: Decatur, Alabama
My guess is that it could be your throttle position sensor is out of whack. Mine ran lean and accelerated like a dog until I adjusted it. Now it's fat and happy. If the above suggestions don't pan out for you, repost your question in the EVO forum or do a search for throttle position sensor and you can get the directions for adjusting it. There is also a video on youtube using a pin stuck down in the sensor wire. I happen to be lucky enough to own a breakout box so the procedure is a little different for me.
carl
carl
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Elite HDF Member
Joined: Nov 2013
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From: Santa Clarita
My guess is that it could be your throttle position sensor is out of whack. Mine ran lean and accelerated like a dog until I adjusted it. Now it's fat and happy. If the above suggestions don't pan out for you, repost your question in the EVO forum or do a search for throttle position sensor and you can get the directions for adjusting it. There is also a video on youtube using a pin stuck down in the sensor wire. I happen to be lucky enough to own a breakout box so the procedure is a little different for me.
carl
carl
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Stellar HDF Member
Joined: Jan 2009
Posts: 2,578
Likes: 463
From: On a Lake, not far from the Gulf
Please don't start adjusting any of the sensors, or replacing the fuel filter until you at least check for codes. There is an On Off key switch sequence explained in the FSM which would probably be a good idea to have if you are going to be "tearing into it".
Then check to see if there is a fuel tuner on the bike. Take it out of line, and connect the ECM directly to the harness. See if it runs better like that. If it does you may need a new map, or the tuner may be bad.
How many miles are on the bike? The fuel filter is scheduled to be replaced at 50,000 miles. Inspect the interior of the tank. Look for any liner that may have dislodged, and possibly restrict fuel flow.
Inspect the air filter element, and clean or replace if it is dirty. Then clean, and inspect the throttle body. Make sure to clean out the two air bleeds at the top of the mouth of the throttle body. Inspect the throttle cables, and linkage and make sure that the butterfly is opening, and closing completely, and smoothly. For giggles and grins i would dump a can of Seafoam on a fresh tank of gas, and see if that perks her up.
Once that is all done then you can begin diagnostics.
Then check to see if there is a fuel tuner on the bike. Take it out of line, and connect the ECM directly to the harness. See if it runs better like that. If it does you may need a new map, or the tuner may be bad.
How many miles are on the bike? The fuel filter is scheduled to be replaced at 50,000 miles. Inspect the interior of the tank. Look for any liner that may have dislodged, and possibly restrict fuel flow.
Inspect the air filter element, and clean or replace if it is dirty. Then clean, and inspect the throttle body. Make sure to clean out the two air bleeds at the top of the mouth of the throttle body. Inspect the throttle cables, and linkage and make sure that the butterfly is opening, and closing completely, and smoothly. For giggles and grins i would dump a can of Seafoam on a fresh tank of gas, and see if that perks her up.
Once that is all done then you can begin diagnostics.
