Question about 2000 Harley Davidson XL 1200 C Sportster Custom

3 Answers

Rear cylinder not firing

This is an intermittant problem but is occurring more regularly now. Happens when engine is hot and when engine is cold.
96 Harley FXDL, Crane hi 4 single fire ignition, 12.53 volts measured at battery terminals, all electrical connections checked for tightness and cleaned.
Forward and aft cylinder electrical leads from ignition module to coil and plug wires switched - Aft cylinder still did not fire. (Coil good)
Lead wires from module checked, intact, no apparent damage.
Module removed from nose cone, inspected, no apparent damage.
New plugs installed and gapped to manufactures specs. (approx 200 miles on new plugs)
Inline spark tester installed, when cylinder not firing very weak spark noticed, when cylinder started firing very strong spark noted.

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  • Rick Lindsey
    Rick Lindsey Dec 13, 2008

    My problem is with a Dyna Screaming Eagle. Plusa and high dollar ignition has been replaced. Bike started and ran for about 15 minutes and then quit again and now will not fire.

  • looneytic May 09, 2009

    same problem here. tested the coil and it was good. swapped coil anyways and replaced plugs and wires. no results. checked all connections. i believe the problem lies within the Crane Hi 4. I think it is a problem with the rev limiter potentiometer. rev limiter is cutting out the rear cylinder at random times. try moving the rev limiter up or down a hair. when i do that it will run in the new spot for a few hundred miles before returning again. once it starts again that spot on the potentiometer is dead. I really need to replace the whole ignition module but my pockets are running on E right now. but if you tried everything else, (coil, plugs, wires, connections, voltage) then you probably need a new module. i am not sure if i want another crane cams because i am finding a lot of people are having trouble with the HI-4 modules failing and it makes me nervous about there other options.

  • Anonymous Mar 18, 2014

    Bike ran fine parked it for a week and will not start coil works no fire at plugs module changed and still will not start

  • Anonymous Mar 26, 2014

    no spark on rear pot,new coil and lead still no spark,front ok so swapped coil leads, now rear ok but front no go, tci coil feed wires orange and grey give different power to test light,checked all block connecters seem ok, what next?

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I agree with "rselvy". Plugs will foul easily when you modify things and do short "test" starts. had it happen twice to my 2000 custom sporty. Both times the front fired but not the rear...(sometimes backfired though) plugs got carbon fouled real quik.

Posted on Mar 21, 2009

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95 Evo, new plugs, new wires, started backfireing like a machine gun, front cyl. no spark at plug sometimes - would this be the coil, have not ohmed the coil yet . Thanks

Posted on May 13, 2009

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The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Posted on Dec 08, 2008

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1 Answer

Harley trouble codes


There are two types of diagnostic trouble codes (DTCs), current and historic. The Check Engine Lamp will not indicate the existence of historic trouble codes.

1 Current 53 ECM flash error

2 Historic 53 ECM flash error

3 Current 54 ECM EEPROM error

4 Historic 54 ECM EEPROM error

5 Current 63 ECM serial data low

6 Current 63 ECM serial data open/high

7 Current 63 TSSM serial data low

8 Current 63 TSSM serial data open/high

9 Current 61 Loss of TSM/TSSM serial data

10 Current 14 Loss of all ECM serial data (state of health)10 24 Loss of vehicle speed10 33 Loss of vehicle inhibit motion10 43 Loss of powertrain security status

11 Current 33 System relay contacts open

12 Current 33 System relay coil high/shorted

13 Current 33 System relay coil open/low

14 Current 33 System relay contacts closed

15 Current 99 Incorrect password

16 Current 99 Missing password

17 Current 41 CKP sensor intermittent

18 Current 41 CKP sensor synch error

19 Current 11 TP sensor open/low

20 Current 11 TP sensor high

21 Current 12 MAP sensor open/low

22 Current 12 MAP sensor high

23 Current 14 ET sensor voltage low

24 Current 14 ET sensor open/high

25 Current 15 IAT sensor voltage low

26 Current 15 IAT sensor open/high

27 Current 24 Front ignition coil open/low

28 Current 25 Rear ignition coil open/low

29 Current 24 Front ignition coil high/shorted

30 Current 25 Rear ignition coil high/shorted

31 Current 24 Front cylinder combustion intermittent

32 Current 25 Rear cylinder combustion intermittent

33 Current 23 Front injector open/low

34 Current 32 Rear injector open/low

35 Current 23 Front injector high

36 Current 32 Rear injector high

37 Current 16 Battery voltage low

38 Current 16 Battery voltage high

39 Current 43 VSS sensor low

40 Current 43 VSS sensor high

41 Current N/A (no speedo code for this) Check engine light open/low NO CHECK ENGINE LAMP AT KEY ON or CHECK ENGINE LAMP ON CONTINUOUSLY

42 Current N/A (no speedo code for this) Check engine light high NO CHECK ENGINE LAMP AT KEY ON

43 Current 35 Tachometer low

44 Current 35 Tachometer high

45 Current 25 Rear cylinder no combustion

46 Current 24 Front cylinder no combustion

47 Current 34 Loss of idle speed control IDLE AIR CONTROL

48 Current 35 Accelerometer fault

49 Current 34 Starter output high

50 Current 25 Ignition enable output high

51 Current 21 Left turn output fault

52 Current 22 Right turn output fault

53 Current 11 Battery voltage high

54 Current 31 Alarm output low

55 Current 32 Alarm output high

56 Current 41 Ignition switch open/low

57 Historic 63 ECM serial data low

58 Historic 63 ECM serial data open/high

59 Historic 63 TSSM serial data low

60 Historic 63 TSSM serial data open/high

61 Historic 61 Loss of TSM/TSSM serial data

62 Historic 14 Loss of all ECM serial data (state of health)

63 Historic 33 System relay contacts open

64 Historic 33 System relay coil high/shorted

65 Historic 33 System relay coil open/low

66 Historic 33 System relay contacts closed

67 Historic 99 Incorrect password

68 Historic 99 Missing password

69 Historic 41 CKP sensor intermittent

70 Historic 41 CKP sensor synch error

71 Historic 11 TP sensor open/low

72 Historic 11 TP sensor high

73 Historic 12 MAP sensor open/low

74 Historic 12 MAP sensor high

75 Historic 14 ET sensor voltage low

76 Historic 14 ET sensor open/high

77 Historic 15 IAT sensor voltage low

78 Historic 15 IAT sensor open/high

79 Historic 24 Front ignition coil open/low

80 Historic 25 Rear ignition coil open/low

81 Historic 24 Front ignition coil high/shorted

82 Historic 25 Rear ignition coil high/shorted

83 Historic 24 Front cylinder combustion intermittent

84 Historic 25 Rear cylinder combustion intermittent

85 Historic 23 Front injector open/low

86 Historic 32 Rear injector open/low

87 Historic 23 Front injector high

88 Historic 32 Rear injector high

89 Historic 16 Battery voltage low

90 Historic 16 Battery voltage high

91 Historic 43 VSS sensor low

92 Historic 43 VSS sensor high

93 Historic N/A Check engine light open/low NO CHECK ENGINE LAMP AT KEY ON or CHECK ENGINE LAMP ON CONTINUOUSLY

94 Historic N/A Check engine light high NO CHECK ENGINE LAMP AT KEY ON

95 Historic 35 Tachometer low

96 Historic 35 Tachometer high

97 Historic 25 Rear cylinder no combustion

98 Historic 24 Front cylinder no combustion

99 Historic 34 Loss of idle speed control

100 Historic 35 Accelerometer fault

101 Historic 34 Starter output high

102 Historic 25 Ignition enable output high

103 Historic 21 Left turn output fault

104 Historic 22 Right turn output fault

105 Historic 11 Battery voltage high

106 Historic 31 Alarm output low

107 Historic 32 Alarm output high

108 Historic 41 Ignition switch open/low

Aug 11, 2014 | 2000 Harley Davidson FLHRCI Road King...

1 Answer

Rear cylinder does not fire 1987 FLHTC


If you're getting fire, but the cylinder isn't getting hot (I always check the exhaust pipe near where it exits the head), possibly you're not getting air/fuel mixture to that cylinder.

Is the intake valve opening?
Check valve adjustment?

Apr 09, 2013 | Harley Davidson Motorcycles

1 Answer

I own a 1988 fat boy.started to missfire on the rear cylinder. have checked the leads /plugs/and single fire coil. start the bike up from cold runs real sweet.take here out on the road roughly 4.5 miles...


I would check the compression on the engine. It should be about a hundred pounds and there should be no more than 10% difference between the cylinders. The next thing I'd do is check the primarys of the coil. Your bike came with a dual fire ignition system on it from the factory so this means that the ignition system is not stock. This is where I'd be suspicious. The coil will have three terminals on it if it's a single fire coil. Check between the center terminal and the outer terminals. You should have 2-3 ohms resistance from the center terminal to one of the outer terminals. Check center to one terminal, then center to the other terminal. If this checks good, it may be the ignition unit itself. Take the cover off of the timer cavity in the nosecone of your engine and go for a ride. If this cures the problem, then you know this is it, getting hot and misfiring. If it keeps missing, stop by a Radio Shack or an electronics supply house and purchase a small can of "component cooler". Ride the bike until it starts missing and spray a bit of the cooler on the ignition unit. See what happens. It could be a vacuum leak as well. Might be the intake to head gaskets or the intake manifold seal where the carb plugs in if the carb is stock.

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Aug 20, 2011 | Harley Davidson FLSTF - FLSTFI Fat Boy...

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When motorclye is at running temp, front cly cuts out sometimes,live data show odd ign timing +120 deg when skipping.when timing numbers got normal bike runs fine, also showing pd097 code in historic after...


The 120° advanced reading may indeed be correct. Here's why. Your bike is equipped with a "dual fire" ignition system which means both spark plugs fire at the same time every time a piston comes to top center. This creates a "wasted spark" as one spark plug is firing on a cylinder that is on the exhaust stroke. Since a Harley engine is a twin cylinder engine that uses only a single crankpin, the pistons are on a cycle that is not exactly 180° apart like in most engines. If I had to take a guess at your problem, I'd say that your fuel air mixture is too lean either due to improper setup or you have a vacuum leak. If your bike is equipped with a carburetor, check to make sure the accelerator pump is working like it should. Take the air filter off so that you can see into the carb. With the engine OFF, crank the throttle to wide open position while watching the brass nozzle just inside the carb opening. It should spray a squirt of fuel into the carb. If it doesn't, you need to replace the diaphragm in the accelerator pump in the float bowl of the carb.

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Jul 26, 2011 | Harley Davidson FLHTC Electra Glide...

2 Answers

On my pipes one side is hot and the other is cold


Check the pipe right where they come out of the heads. It depends on what type of exhaust system you have on your Road King. If the stock exhaust is on the bike, the rear cylinder exhaust is directed to both mufflers. With the exhaust from the front and part of the exhaust from the rear cylinders going to the right side muffler, it gets more exhaust than the left side and runs hotter. Like I said, check the temp of the exhaust pipes at the cylinder heads. If one of them is cold, that cylinder is not firing. As long as both of the pipes are hot there, you're fine. Just ride the bike and have fun.

Ride Safe.
Stevev

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1 Answer

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