Question about Harley Davidson FLSTC Heritage Softail Classic Motorcycles

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What caused my engine to quit at highway speed, then restart with no further problems?

HD FLSTC 2003: I was on the expressway doing steady 70mph and suddenly the engine quit, basically coasting. I was able to pull over, shut off ignition, and restart engine with no evidence anything was wrong. I rode home later (local roads) with no problems. Oil was a little low, so I topped off. Where should I start looking? I'm assuming I didn't accidentally hit the engine switch since I was just riding steady in my lane, but I'm not ruling it out yet. Besides, would the bike coast as if in neutral? Seems it would have engine-braked, which it did not. Thanks for your time.

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Hi Edwin, the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system and or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty CKP, CPS, CMP, MAP, TPS, or BAS sensor, corrroded, loose or broken wire connector pins/sockets.
8. Water or dirt in the fuel system, carburetor or filter.
9. . Restricted, blocked or kinked fuel line.
10. Fuel tank empty.
11. Gas cap is not venting properly or fuel tank venting system blocked.
12. A failed fuel pump, pressure regulator and or fuel injectors.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
For more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at xlch@mail.com. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics
Harley Davidson Manuals Mark Workshop
Harley Check Engine Lamp Diagnostics

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Sep 05, 2015

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