Engine Miss
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3rd Gear
Joined: Aug 2009
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Engine Miss
Ok, first off, I already did a search and I did find one person that had posted the same problem, but it didn't show a resolution. So, maybe I'll have better luck.
2002 Road King /w 50k and EFI.
idle's good, accelerates good, but when I'm running steady throttle over 2200 rpm, it starts to miss. The longer I ride it, the worse it gets.
I figured fuel filter as it's never been changed. So, new fuel filter, new lines inside tank, new plugs and plug wires.
Test rode it about 2 miles, ran great. Decided to take it down to get gas, it missed twice on the 3 mile ride. Took the long way home after refueling and the longer I rode it, the worse and more frequent the miss got.
Not sure where to go from here. I'll check the air cleaner tonight to make sure it's not plugged up and I'll look for any vacuum leaks.
Does anyone have any idea why it would do this? Battery cables are tight and groung is tight and both look to be in good shape. Don't know if this is going to be electrical or fuel/air.
Much appreciated for any help or ideas you can give me. I'm about ready to throw a road flare in the gas tank. haha
2002 Road King /w 50k and EFI.
idle's good, accelerates good, but when I'm running steady throttle over 2200 rpm, it starts to miss. The longer I ride it, the worse it gets.
I figured fuel filter as it's never been changed. So, new fuel filter, new lines inside tank, new plugs and plug wires.
Test rode it about 2 miles, ran great. Decided to take it down to get gas, it missed twice on the 3 mile ride. Took the long way home after refueling and the longer I rode it, the worse and more frequent the miss got.
Not sure where to go from here. I'll check the air cleaner tonight to make sure it's not plugged up and I'll look for any vacuum leaks.
Does anyone have any idea why it would do this? Battery cables are tight and groung is tight and both look to be in good shape. Don't know if this is going to be electrical or fuel/air.
Much appreciated for any help or ideas you can give me. I'm about ready to throw a road flare in the gas tank. haha
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Joined: Mar 2008
Posts: 3,471
Likes: 5
From: Ocala, FL
Ok, first off, I already did a search and I did find one person that had posted the same problem, but it didn't show a resolution. So, maybe I'll have better luck.
2002 Road King /w 50k and EFI.
idle's good, accelerates good, but when I'm running steady throttle over 2200 rpm, it starts to miss. The longer I ride it, the worse it gets.
I figured fuel filter as it's never been changed. So, new fuel filter, new lines inside tank, new plugs and plug wires.
Test rode it about 2 miles, ran great. Decided to take it down to get gas, it missed twice on the 3 mile ride. Took the long way home after refueling and the longer I rode it, the worse and more frequent the miss got.
Not sure where to go from here. I'll check the air cleaner tonight to make sure it's not plugged up and I'll look for any vacuum leaks.
Does anyone have any idea why it would do this? Battery cables are tight and groung is tight and both look to be in good shape. Don't know if this is going to be electrical or fuel/air.
Much appreciated for any help or ideas you can give me. I'm about ready to throw a road flare in the gas tank. haha
2002 Road King /w 50k and EFI.
idle's good, accelerates good, but when I'm running steady throttle over 2200 rpm, it starts to miss. The longer I ride it, the worse it gets.
I figured fuel filter as it's never been changed. So, new fuel filter, new lines inside tank, new plugs and plug wires.
Test rode it about 2 miles, ran great. Decided to take it down to get gas, it missed twice on the 3 mile ride. Took the long way home after refueling and the longer I rode it, the worse and more frequent the miss got.
Not sure where to go from here. I'll check the air cleaner tonight to make sure it's not plugged up and I'll look for any vacuum leaks.
Does anyone have any idea why it would do this? Battery cables are tight and groung is tight and both look to be in good shape. Don't know if this is going to be electrical or fuel/air.
Much appreciated for any help or ideas you can give me. I'm about ready to throw a road flare in the gas tank. haha
Didn't go back to the original map so I am not sure if it was just too lean of a mixture that only showed up after it was warmed up, or if the original map may have somehow gotten corrupted. I would have to think it is the former.
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3rd Gear
Joined: Aug 2009
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Thanks for the reply. I never thought about the mapping getting corrupted.
I'm probably going to have to take it to a shop to at least troubleshoot the problem. So long as I know what it is, I can fix it. But I could spend a ton of money just blindly replacing parts. haha
I'm probably going to have to take it to a shop to at least troubleshoot the problem. So long as I know what it is, I can fix it. But I could spend a ton of money just blindly replacing parts. haha
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3rd Gear
Joined: Aug 2009
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I have a number for a mechanic that may have some ideas for me that I'll be calling later on. I'll post here if I find a resolution.
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3rd Gear
Joined: Aug 2009
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Last night I put in a new Throttle Position Sensor. It ran fine for the 15 miles to work, but until I've burned up this 3/4 tank of gas and it hasn't done it, I won't consider it fixed. I think it's just trying to lure me into a false sense of security.
If this doesn't fix it, the next part I go after is the MAP sensor...according to the dealer, that is a fairly common replaced item after 50k.
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Joined: Nov 2006
Posts: 13,702
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From: Houston area
You do not clarify if you checked plugs/wires/coils.
I would go to plugs first...in your case...next. The miss a partially fouling/failing plug can vary greatly. Wires you can check easy with a multimeter...just be sure to wiggle them around when checking. Coils can develop a crack that worsens with heat. Not much rocket science going on in a Harley and looking at fuel has not solved it yet for you.
I would go to plugs first...in your case...next. The miss a partially fouling/failing plug can vary greatly. Wires you can check easy with a multimeter...just be sure to wiggle them around when checking. Coils can develop a crack that worsens with heat. Not much rocket science going on in a Harley and looking at fuel has not solved it yet for you.
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