Hot bike questions...
#12
07-26-2014 | 05:32 PM
Stage IV
Joined: Mar 2007
Posts: 4
Likes: 0
From:
This is out of the 06 owners manual. Early version of engine temperature management.
Injected Twin Cam High Temperature Idle
Fuel injected Twin Cam engines use a four phase heat management system to reduce engine temperature under extreme conditions. A rider with a very hot engine may notice the affects of this four phase heat management system and incorrectly assume an idle problem exists.
Phase 1: When the engine temperature sensor signals that the cylinder head has reached approximately 266° F (130° C) the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 900 RPM.
Phase 2: If engine temperature reaches 293° F (145° C), the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 RPM.
Phase 3: If the engine temperature reaches 322° F (161° C), the ECM richens the air/fuel ratio to provide additional cooling and advances the spark timing 10°.
Phase 4: If the engine temperature reaches 331° F (166° C), fuel injector pulses (2 of 8) are randomly 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 fourth stage will only happen when the motorcycle is stationary.
If necessary, engine idle speed will be increased during all Phases to maintain proper battery voltage.
Injected Twin Cam High Temperature Idle
Fuel injected Twin Cam engines use a four phase heat management system to reduce engine temperature under extreme conditions. A rider with a very hot engine may notice the affects of this four phase heat management system and incorrectly assume an idle problem exists.
Phase 1: When the engine temperature sensor signals that the cylinder head has reached approximately 266° F (130° C) the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 900 RPM.
Phase 2: If engine temperature reaches 293° F (145° C), the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 RPM.
Phase 3: If the engine temperature reaches 322° F (161° C), the ECM richens the air/fuel ratio to provide additional cooling and advances the spark timing 10°.
Phase 4: If the engine temperature reaches 331° F (166° C), fuel injector pulses (2 of 8) are randomly 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 fourth stage will only happen when the motorcycle is stationary.
If necessary, engine idle speed will be increased during all Phases to maintain proper battery voltage.
#13
07-27-2014 | 08:19 AM
Supporter
Joined: Jul 2007
Posts: 2,196
Likes: 9
From: Shenandoah, TX
This is out of the 06 owners manual. Early version of engine temperature management.
Injected Twin Cam High Temperature Idle
Fuel injected Twin Cam engines use a four phase heat management system to reduce engine temperature under extreme conditions. A rider with a very hot engine may notice the affects of this four phase heat management system and incorrectly assume an idle problem exists.
Phase 1: When the engine temperature sensor signals that the cylinder head has reached approximately 266° F (130° C) the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 900 RPM.
Phase 2: If engine temperature reaches 293° F (145° C), the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 RPM.
Phase 3: If the engine temperature reaches 322° F (161° C), the ECM richens the air/fuel ratio to provide additional cooling and advances the spark timing 10°.
Phase 4: If the engine temperature reaches 331° F (166° C), fuel injector pulses (2 of 8) are randomly 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 fourth stage will only happen when the motorcycle is stationary.
If necessary, engine idle speed will be increased during all Phases to maintain proper battery voltage.
Injected Twin Cam High Temperature Idle
Fuel injected Twin Cam engines use a four phase heat management system to reduce engine temperature under extreme conditions. A rider with a very hot engine may notice the affects of this four phase heat management system and incorrectly assume an idle problem exists.
Phase 1: When the engine temperature sensor signals that the cylinder head has reached approximately 266° F (130° C) the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 900 RPM.
Phase 2: If engine temperature reaches 293° F (145° C), the ECM will gradually reduce engine idle speed until the engine temperature drops or the engine reaches 800 RPM.
Phase 3: If the engine temperature reaches 322° F (161° C), the ECM richens the air/fuel ratio to provide additional cooling and advances the spark timing 10°.
Phase 4: If the engine temperature reaches 331° F (166° C), fuel injector pulses (2 of 8) are randomly 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 fourth stage will only happen when the motorcycle is stationary.
If necessary, engine idle speed will be increased during all Phases to maintain proper battery voltage.
Thread
Thread Starter
Forum
Replies
Last Post