Please help hesitate/missing
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5th Gear
Joined: Aug 2017
Posts: 9
Likes: 0
From: Wisconsin
Please help hesitate/missing
07 ultra classic stock except for pipes which have been on for years. Just recently I have started to get a "studder" or miss feeling between 2500 and about 3200 RPM. In addition, the bike idles a lot rougher. Cranks fine and seems to be fine other then the studder so to speak. Changed temp sensor, plugs, changed TPS(from what I can tell does not need to be calibrated) as well as changed air filter. Checked fuel filter and seems fine. Also does it full tank and non full tank so not a hole problem in the fuel tank hose. I cleaned the IAC and it appears to be operating fine. NO CODES have ever been thrown and or stored, checked them. Also, not bad gas cause I drained the fuel and re-filled as well as ran sea foam through it. Please help! I did notice my breather hoses are pretty cracked and rough shape but can't imagine it is that?
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,005
From: Charleston, SC
Couple things I would check:
1. Cracked header right before the split at rear cylinder.
2. Intake seals leaking - spray WD40 right at them while the engine is running.
3. Coil connections - look for corrosion.
4. Throttle blade loose and/or out of sync with throttle cables/sensors.
5. Crank position sensor.
6. Rubber plug on top of intake missing/cracked?
7. Continuity of the fuel injector wires all the way back to the ECM.
1. Cracked header right before the split at rear cylinder.
2. Intake seals leaking - spray WD40 right at them while the engine is running.
3. Coil connections - look for corrosion.
4. Throttle blade loose and/or out of sync with throttle cables/sensors.
5. Crank position sensor.
6. Rubber plug on top of intake missing/cracked?
7. Continuity of the fuel injector wires all the way back to the ECM.
Last edited by lp; Sep 17, 2017 at 07:14 AM.
Stellar HDF Member
Joined: Sep 2006
Posts: 3,236
Likes: 95
From: lancaster, pa
you seem to be on the right track. I googled each sensor and studied the sighns of there failure and worked backwards.think theres about 8 on the 2007.
you said you cleaned the iac? I replaced mine and realized it was corroded and only real way to clean area was to remove and get in there good.
tps replaced did not need calibrateing for 07'
had an occational stumble few years now its been gone after i put a generic fuel pump in for 49$
you said you cleaned the iac? I replaced mine and realized it was corroded and only real way to clean area was to remove and get in there good.
tps replaced did not need calibrateing for 07'
had an occational stumble few years now its been gone after i put a generic fuel pump in for 49$
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Thread Starter
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5th Gear
Joined: Aug 2017
Posts: 9
Likes: 0
From: Wisconsin
Couple things I would check:
1. Cracked header right before the split at rear cylinder.
2. Intake seals leaking - spray WD40 right at them while the engine is running.
3. Coil connections - look for corrosion.
4. Throttle blade loose and/or out of sync with throttle cables/sensors.
5. Crank position sensor.
6. Rubber plug on top of intake missing/cracked?
7. Continuity of the fuel injector wires all the way back to the ECM.
1. Cracked header right before the split at rear cylinder.
2. Intake seals leaking - spray WD40 right at them while the engine is running.
3. Coil connections - look for corrosion.
4. Throttle blade loose and/or out of sync with throttle cables/sensors.
5. Crank position sensor.
6. Rubber plug on top of intake missing/cracked?
7. Continuity of the fuel injector wires all the way back to the ECM.
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Road Warrior
Joined: Nov 2007
Posts: 1,800
Likes: 307
From: Houston, Texas
Fuel tank hose leak problem is caused when there is a pin hole in the pressurized fuel line so it doesn't care how much fuel is in the line. When less than half tank, remove fuel cap, shine a light in the tank and turn the ignition on to turn on the fuel pump. If you see any spray inside the tank, you have a hole in your fuel line.
You also said you checked the fuel filter but there's no real good way to do that that I know of. Big questions is when was the last time it was changed?
You also said you checked the fuel filter but there's no real good way to do that that I know of. Big questions is when was the last time it was changed?
Thread Starter
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5th Gear
Joined: Aug 2017
Posts: 9
Likes: 0
From: Wisconsin
Fuel tank hose leak problem is caused when there is a pin hole in the pressurized fuel line so it doesn't care how much fuel is in the line. When less than half tank, remove fuel cap, shine a light in the tank and turn the ignition on to turn on the fuel pump. If you see any spray inside the tank, you have a hole in your fuel line.
You also said you checked the fuel filter but there's no real good way to do that that I know of. Big questions is when was the last time it was changed?
You also said you checked the fuel filter but there's no real good way to do that that I know of. Big questions is when was the last time it was changed?