Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

2 Answers

No rear spark, put on new coil, new plug wires and new crank position sensor, still only running on front cylinder.

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  • qweenjules Sep 03, 2008

    I have fuel injection so I don't have an ignition module (that's what I was told), but thanks anyway. Any suggestions is helpful.



    Julie

  • gwalkerides Feb 05, 2009

    no front spark

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2 Answers

If you have an injected bike and it uses an ecu for engine management, it could be that the output transistor or driver circuits in the ecu are bad. if you are sure the rear has no fire that is probably that or if you have twin injectors, it could be a bad injector if you have fire. i assume you have a single fire ignition so you can perform this simple test. both plugs out, pull connector for coil, use jumper wires to connect back to the coil except reverse the wires for the cylinders, roll engine over and observe plugs, if the cylinders switch, then you need a new ecu. this is if you made sure wiring is ok first.

Posted on Sep 07, 2008

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I had almost the same thing happen on my 03 sportster it was the ignition modual dont know what year yours is but 03s are bad about messing up harley said they fixed the problem on the replacements

Posted on Sep 02, 2008

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No spark to front coil pack



Judging by your question you have automotive experience though for safety sake I will have to state some precautions anyhow. With the engine running and in park with the emergency brake set. Check your working coil packs "hot" wire with a multi meter. Set to 12 volts and check amperage and volts delivered. I would recomend checking each of the working cylinders if possible to establish base line readings. If you are receiving similar readings on the down cylinder then you have a short in the coil pack and it will need replaced. If you are not receiving a similar voltage and amperage you likely have a short and should trace the feed wire for that coil. As with all repairs if you are not absolutely sure of your capabilities to fix the problem you should seek the help of a professional. Happy motoring.

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I have a 2005 cysler 300C hemi 5.7. Ho do i find the crankshaft position sensor and How do I determine which cylinder is #1 and #7? I recently changed all coil 8 coil packs and 16 spark plugs. I have a...


Hello! See diagram below of the location of Crankshaft Positioning Sensor (CPS)...It has a 3 wire connector with the following wire colors...Dark Blue/Dark Green (ground)...Dark Blue/White (signal lead)...And Pink/Yellow (+5 volts)...

Looking at the front of the engine...The left bank (front to rear) are 2, 4, 6, 8...
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Only running on rear cylinder.


Hello,
Your bike needs three thing to run.

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The first thing to check is the spark on the front cylinder. You should remove the front spark plug and then put it back in the plug wire. Make sure that the spark plug is grounded by placing the threaded portion on the cylinder head fins. Now you can crank the engine over and watch for spark. If it does not spark you have an ignition problem, replace the plug with a new one and try again.

The next step is to check the compression. You will need a compression tester with the proper adaptor to thread into the spark plug hole. Remove the rear spark plug wire. Once the compression tester is installed crank the motor over with the throttle all the way open. Your compression should read at least 150 psi. If the compression is very low you need to have the motor dissasembled for inspection.

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Thanks and I hope that this helps.
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