Engine RelatedTips on spark plugs, setting engine idles speeds, exhaust, and other engine related issues.
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The 2002 and later fuel injected Twin Cam engines use a three phase heat management system to reduce engine temperature under extreme conditions. Be aware that a rider with a very hot engine may notice the affects of this three phase heat management system and incorrectly assume an idle problem exists.
Phase 1 - At approximately 320Ëš F the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 rpm.
Phase 2 - If engine temperature reaches 338Ëš F the ECM richens the air/fuel ratio to provide additional cooling.
Phase 3 - If the engine temperature reaches 356Ëš F fuel injector pulses are interrupted. The air drawn in and expelled helps cool the engine further. Since there is no combustion it would be perceived as a misfire. This third stage will only happen when the motorcycle is stationary.
These are head temps as indicated and NOT oil temps
Reference: H-D Owner's Manual.
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EFI Heat Management
