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Old 11-06-2012, 10:05 AM   #1 (permalink)
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engine temp sensor

Good day all! Can some one tell me what the et sensor does? My 03 ultra has a loss of power when it gets hot and spits and sputters and almost dies. Thanks and REMEMBER TO GO VOTE OR DON'T BITCH!
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Old 11-07-2012, 08:12 AM   #2 (permalink)
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Simplified, the ET sensor tells the ECM what the temp of the front head is. With that signal the ECM changes timing and fuel delivery to match a map stored in the ECM EEPROM.

If there aren't any stored codes which happens sometimes with a failing ET sensor you can do a simple test. Determine how long it takes untill the engine starts acting up. After the engine cools back down remove the sensor from the head and plug the electrical connector back onto it. Locate the sensor away from the engine heat and start the engine and run it untill it's hot. If the engine doesn't act up in the same amount of time it's a good bet the sensor is failing.
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Old 11-07-2012, 08:15 AM   #3 (permalink)
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As well, I'd also check intake seals for leaks. Bike runs ubber rich when cold and can mask intake seal leaks. Once warm, the AFR is too lean. No adjustments on 2002-2006 models. Only cold/warm maps. Could be either the temp sensor or intake.
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Old 11-07-2012, 08:20 AM   #4 (permalink)
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Also with the sensor removed the engine idle will remain high, in cold idle mode.
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Old 11-07-2012, 08:39 AM   #5 (permalink)
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Ahh sensors , ya gotta love failing sensors on ALL the newer Harley's . Sometimes newer doesn't equate to better , especially when it comes to Harley's !
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Old 11-07-2012, 08:51 AM   #6 (permalink)
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Quote:
Originally Posted by THE ROAD View Post
Ahh sensors , ya gotta love failing sensors on ALL the newer Harley's . Sometimes newer doesn't equate to better , especially when it comes to Harley's !
True so true..
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Old 11-07-2012, 10:00 AM   #7 (permalink)
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Garage
By reading this thread I just learned something today, another day not wasted...
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Old 11-07-2012, 02:49 PM   #8 (permalink)
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thanks gents i'll give it a whirl!!
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