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Fuel Injection NoticeSome fuel injected models may experience the “engine” light intermittently coming on. This condition is caused by the neon wires having a "different" resistance than the stock wires. This "difference" is not a problem, but is just that, "different" than stock. The reason this happens only on fuel injected models is as follows. The Harley Davidson engineers had this wonderfully powerful computer on these models anyway so they thought they would incorporated some "cool extras" into it's on board diagnostic functions. The fuel injected models have a fourth wire in the coil which carburetor models do not called the ION Sensor. This sensor measures the resistance in the ignition wires at high load and high speeds. It basically checks the wires to see what condition they are in as you ride. The "computer" being just that a "computer." Lives in a world of 1 and 0s. It must have programmed in limits to look for and only knows what it's program tells it is OK or "normal." Being neon is much more efficient than the stock wires, yet will show as an "open" when checked with only 12 volts. The reading for their resistance falls outside of the computers programmed limits. This is not necessarily a bad thing, just outside what it was told to look for as OK. Hence when it sees these more efficient wires with "different" firing resistance, all it knows is it is "different" than it was told it should see. So, it turns on the light to let you know it saw something "different." This can happen even when you change wire brands that don't have neon in them, such as solid core wires or steel braided cables. This function of the ION sensor and computer is for (as stated in the Harley Davidson Fuel injection manual part # 99498-02 on page 5-67) "Diagnostic purposes only." Which means it is only for the purpose of checking the wire and secondary coil resistance and condition. The fuel injection computer does not use this signal; to set or adjust any of the operating parameters of the ignition or fuel injection system off of these readings. That is why it does not affect the way your bike runs, nor will hurt your bike in any way. Which is what is meant by "Diagnostic" purposes only. We hope this explanation of just what is going on and why, will show you that there is "No Magic" to ignition neon, just science. We also hope after getting the real reason as to why this is happening from us, as opposed to the lame explanations given from other companies. It will show just who really knows what is going on in the neon ignition world, and who is just winging it. This notice is being placed on 5/30/04. If the other companies out there should suddenly have an explanation as thorough as ours after this date there's "No Magic" where they stole it from. |
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