Engine skipping

Discussion in 'Sportster Models' started by RockSlyde, Feb 23, 2013.

  1. RockSlyde

    RockSlyde New Member

    I have an '05 1200 custom that I bought new in 05. About six months after I got it , the engine started skipping real bad. The dealer changed the CPS and all was well for about 2 years. Now for the past few years it has an intermittent skip while riding. I can ride 1 mile and it will do or 100 miles and it may skip once or twice or not at all. The speed or rpms doen't seem to make a differance when it skips. It feels like if you were to turn the switch off for about a second or two then back on, then it will run fine until it does it again if it does it again. I changed the CPS again about a year ago because I had read somewhere that they had a bad batch of them around the time I bought it so I figured the one they replaced it with might have been bad too. But it still has the skip. Any ideas would be appreciated. :wall

    Thanks in advance,

  2. gator508

    gator508 Well-Known Member

    You may want to check the battery cables for tightness. Had a similar problem when I had my 07 sportster. Found the positive cable was loose and tightened it, no more problem.
  3. HDDon

    HDDon Experienced Member Contributor Retired Moderators

    Gator may have you covered. You might want to check all the plug in connections, I had one under the seat of my '94FLSTC that one of the pins (male) connectors had moved back and caused the same type of problem. After checking the connections don't forget the dialectric grease.
  4. Jack Klarich

    Jack Klarich Guest

    Have you run a diagnostics on it yet? Diagnostic Trouble Codes for '04 and later Sportsters
    Be advised this only applies to the full serial data bikes, ie 04 and 05's

    The IM (instrument module) is capable of displaying DTC's (diagnostic trouble codes).

    Speedometer Self Diagnostics: The speedometer is capable of displaying and clearing speedometer, tachometer, TSM/TSSM and ICM/ECM Diagnostic Trouble Codes (DTC).

    Turn Ignition switch to OFF & Run/Stop switch is to Run.

    Push odometer reset button in & hold.

    Turn ignition switch to Ignition and release odometer reset button. Background lighting sould illuminate, speedometer needle should sweep its full range and indicator lamps (battery, security, low fuel, check engine and cruise) should illuminate. The word “diag” should then appear.

    Push the odometer reset button once and you will see the selection menu "PSSPt" with the first P flashing.

    Each letter represents an area of the diagnostics module. The module that is flashing is the one you are going to check. To move from one letter (module) to the next, you push the odometer reset button one time. (from P to S to SP to t and back to P, etc.)

    P = ECM/ICM (Electronic Control Module (EFI) / (Ignition Control Module, 'Carbureted')
    S = TSM/TSSM (Turn Signal/ Turn Signal Security Module)
    SP = speedometer
    T = tachometer

    To get the DTC within an area of diagnostics, push and hold the odometer reset button in for 5 seconds and release. If there are any DTC’s the code will be displayed or the word “none” will appear if there are no DTC’s. Push the odometer reset button again to view additional codes if they exist.

    Record the codes.

    If DTC’s are not to be cleared, Press and release the odometer reset button. Part number of module will be displayed.
    NOTE: To determine if a code is current or historic, clear the displayed code by pushing in and holding the odometer reset button ( longer than 5 seconds) until 'clear' comes up. Release the odometer reset button. Turn OFF the ignition switch. Run
    your bike and shut it down then recheck the DTC’s again by repeating steps 1 to 9. If the code is current it will reappear.

    Press and release the odometer reset button to continue to the next module.

    Turn Ignition switch to OFF.


    B0563 Battery Voltage High TSM/TSSM
    B1004 Fuel Level Sending Unit Low Instruments
    B1005 Fuel Level Sending Unit High/Open Instruments
    B1006 Accessory Line Overvoltage Instruments
    B1007 Ignition Line Overvoltage Instruments
    B1008 Reset Switch Closed Instruments
    B1131 Alarm Output Low TSM/TSSM
    B1132 Alarm Output High TSM/TSSM
    B1134 Starter Output High TSM/TSSM
    B1135 Accelerometer Fault TSM/TSSM
    B1151 Sidecar BAS Low TSM/TSSM
    B1152 Sidecar BAS High TSM/TSSM
    B1153 Sidecar BAS Out of Range TSM/TSSM
    P0106 MAP Sensor Rate of Range Error Carb
    P0107 Map Sensor Failed Open/Low Carb
    P0107 Map Sensor Open/Low EFI
    P0108 Map Sensor Failed High Carb
    P0108 Map Sensor High EFI
    P0112 IAT Sensor Voltage Low EFI
    P0113 IAT Sensor Voltage Open/High EFI
    P0117 ET Sensor Voltage Low EFI
    P0118 ET Sensor Voltage Open/High EFI
    P0122 TP Sensor Open/Low EFI
    P0123 TP Sensor High EFI
    P0261 Front Injector Open/Low EFI
    P0262 Front Injector High EFI
    P0263 Rear Injector Open/Low EFI
    P0264 Rear Injector High EFI
    P0373 CKP Sensor Intermittent Carb
    P0373 CKP Sensor Intermittent EFI
    P0374 CKP Sensor Not Detected Carb
    P0374 CKP Sensor Synch Error EFI
    P0501 VSS Low Carb
    P0501 VSS Low EFI
    P0502 VSS High/Open Carb
    P0502 VSS High/Open EFI
    P0505 Loss of Idle Sped Control EFI
    P0562 Battery Voltage Low Carb
    P0562 Battery Voltage Low EFI
    P0563 Battery Voltage High Carb
    P0563 Battery Voltage High EFI
    P0602 Calibration Memory Error Carb
    P0603 EEPROM Failure Carb
    P0603 ECM EEPROM Error EFI
    P0604 RAM Failure Carb
    P0605 Program Memory Error Carb
    P0605 ECM Flash Error EFI
    P0607 Converter Error Carb
    P1001 System Relay Coil Open/Low EFI
    P1002 System relay Coil High/Shorted EFI
    P1003 System relay Contacts Open EFI
    P1004 System Relay Contacts Closed EFI
    P1009 Incorrect Password Carb
    P1009 Incorrect Password EFI
    P1010 Missing Password Carb
    P1010 Missing Password EFI
    P1351 Front Ignition Open/Low Carb
    P1351 Front Ignition Open/Low EFI
    P1352 Front Ignition Coil High/Shorted Carb
    P1352 Front Ignition Coil High/Shorted EFI
    P1353 Front Cylinder No Combustion EFI
    P1354 Rear Ignition Coil Open/Low Carb
    P1354 Rear Ignition Coil Open/Low EFI
    P1355 Rear Ignition Coil High/Shorted Carb
    P1355 Rear Ignition Coil High/Shorted EFI
    P1356 Rear Cylinder No Combustion EFI
    P1357 Intermittent Secondary Front EFI
    P1358 Intermittent Secondary Rear EFI
    U1016 Loss of ICM/ECM Serial Data Instruments
    U1016 Loss of ECM Serial Data, Vehicle Speed, Vehicle Inhibit Motion or
    Powertrain Security Status TSM/TSSM
    U1064 Loss of TSM/TSSM Serial Data Carb
    U1064 Loss of TSM/TSSM Serial Data EFI
    U1064 Loss of TSM/TSSM Serial Data Instruments
    U1097 Loss of Speedometer Serial data Carb
    U1097 Loss of Speedometer Serial data EFI
    U1097 Loss of Speedometer Serial data TSM/TSSM
    U1255 Missing Message at Speedometer EFI
    U1255 Serial Data Error/Missing Message EFI
    U1255 Serial Data Error/Missing Message Instruments
    U1255 Serial Data Error/Missing Message TSM/TSSM
    U1300 Serial Data Low Carb
    U1300 Serial Data Low EFI
    U1300 Serial Data Low Instruments
    U1300 Serial Data Low TSM/TSSM
    U1301 Serial Data Open/High Carb
    U1301 Serial Data Open/High EFI
    U1301 Serial Data Open/High Instruments
    U1301 Serial Data Open/High TSM/TSSM
    AFR – Air Fuel Ratio

    ATS – Air Temperature Sensor

    BAS – Bank Angle Sensor

    CCM – Cruise Control Module

    CKP – Crank Position Sensor. The CKP generates an “AC signal” which is sent to the ECM where it is used to reference engine position (TDC) and speed.

    DTC – Diagnostic Trouble Codes

    ECM – Electronic Control Module. (The Computer) Computes the spark advance for proper ignition timing and fuel control based on sensor inputs (from CKP, MAP & TP sensors) and controls the low-voltage circuits for the ignition coils and injectors. The dwell time for the ignition coil is also calculated in the microprocessor and is dependent upon battery voltage. The programmed dwell feature gives adequate spark at all speeds.

    ECT – Engine Coolant Temperature. Sensor also controls the cooling fan relay that provides 12 Vdc to the fans.

    EFI – Electronic Fuel Injection

    EFP – Electronic Fuel Pump

    ET – Engine Temperature sensor

    FI – Fuel Injectors

    FPR – Fuel Pressure regulator

    IAC – Idle Air Control actuator

    IAT – Intake Air Temperature sensor

    ISS – Ion Sensing System…detonation detection

    MAP – manifold Absolute Pressure sensor. The MAP sensor monitors the intake manifold pressure (vacuum) and sends the information to the ECM. The EMC then adjusts the spark and fuel-timing advance curves for optimum performance.

    TP – Throttle Position Sensor

    TSM/TSSM (Turn Signal/ Turn Signal Security Module)

    VE – Volume Efficiency

    VSS – Vehicle Speed Sensor. Used as an input for idle speed control
  5. RockSlyde

    RockSlyde New Member

    Thanks guys. I check for a code. If I remember right, I did change the battery a few years back and I just put a new one in it about a year ago also. I now have a battery tender which I did not have before. I'll check all of the connections also.

    Thanks, Jesse