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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #31  
Old 27th June 2022
sportsterdoc sportsterdoc is offline
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There are two likely issues when failure is heat related.
1. Crank Position Sensor as mentioned by Rejean
2. Coil

IXL2Relax referenced Sporsterpedia.

Below is from the electrical stickies:

Single fire coil testing for carbed (ICM) rubsters, 2004-2006
Coil 31655-99 has three connectorized primary terminals (- + -), referenced 1 (rear) 2 (12 VDC) 3 (front) and twin coil towers.
Primary resistance is from + to -, both 2 to 1 and 2 to 3 at 0.5 to 0.7 ohms.
Secondary (high voltage) winding resistance is tested from coil tower to coil tower at 11,000 ohms to 15,000 ohms.

Note: If resistance is lower than specified, that winding has partially shorted, bypassing part of the coil.

If resistance is higher, then corrosion or failing internal connections may be adding to the resistance.

Spοrtster CKP Testing
Spοrtster crank position sensors are 2 wire units, which may be described as variable reluctance sensors or magnetic pulse gеnerators, etc. They do not have as clean a signal as hаll еffect, but generally more durable (simple coil). As with the hаll еffect, they are typically rated -40 C to 150 C (300F).

For 2004-2006 Spοrtsters, the vοltmeter red lead is connected to ICM position 8 and the black lead to ICM position 9.

For 2007-2013 Spοrtsters, the vοltmeter read lead is connected to ECM position 30 and the black lead to ECM position 12.

Note: This is a sine wave and requires the AC scale
While cranking: ~ 0.3 VAC
At idle: ~ 1 VAC
Static: N/A

When your bike is not starting, this basic test will validate a functional CKP or indicate a failed CKP. A failed unit will not provide a signal. However, this is not sufficient to test for a failing unit with inconsistent output.
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  #32  
Old 28th June 2022
denguy denguy is offline
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Time to take that bike to a Harley dealer service department.
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  #33  
Old 28th June 2022
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Mr Dream Merchant Mr Dream Merchant is offline
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Bike starts fine and runs good for about 15 or 20 min. Then idle starts to drop and sputter. I will run a Diag on it tomorrow.
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  #34  
Old 2nd July 2022
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Mr Dream Merchant Mr Dream Merchant is offline
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No Luck....This is what I did so far. Bike has almost 50k miles that I put on so I know the history. Took the carb off and apart and cleaned. Reinstalled with no fix. Manual says replace coil way long before 50k miles so I replaced it. Also went into DIAGs and none error coded in any category. Last thing I did was started it let in warm and the idle dropped as it warmed until about to cut off so I sprayed the Crank Position Sensor with upside down compressed air to freeze it to lower the temp, as I heard cooling it will bring the idle back up if the sensor is bad. Cooling it did nothing. Since no errors I assume the ICM is fine and there is another sensor heat related issue. What about the Temp. Sending unit?

Last edited by Mr Dream Merchant; 2nd July 2022 at 02:11.. Reason: kjh
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