ECM shuts down a cylinder if engine gets too hot? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 42 (permalink) Old 05-25-2010, 07:37 PM Thread Starter
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Question ECM shuts down a cylinder if engine gets too hot?

I saw this on another forum and found it very interesting:

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If the engine gets too hot the rear cylinder will stop fueling and sparking via the ECM...but continues to cycle air through the cylinder to act like an air pump therefore reducing the heat and keeping the engine from blowing up!!
Can someone verify that this is true? If so, it's impressive. I think it is supposed to happen at 300 degrees F. Also, if so, does it work for each cylinder independently or just the rear cylinder? What year was this made available and is it available on all models?
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post #2 of 42 (permalink) Old 05-25-2010, 08:03 PM
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this is true for 07 and up select models......its called EITMS engine temperature management...it only controls rear cylinder....first it will fatten up the afr then cut rear cylinder....it stays off until it sees throttle or vehicle movement

HD TECH
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post #3 of 42 (permalink) Old 05-25-2010, 08:07 PM Thread Starter
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Originally Posted by sgray45439 View Post
this is true for 07 and up select models......its called EITMS engine temperature management...it only controls rear cylinder....first it will fatten up the afr then cut rear cylinder....it stays off until it sees throttle or vehicle movement
What is "afr"? Air fuel ratio? Meaning it will make the mixture richer?
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post #4 of 42 (permalink) Old 05-25-2010, 08:11 PM
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yes sir....it will try to cool by adding fuel.....last resort is to shut rear cylinder off

HD TECH
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post #5 of 42 (permalink) Old 05-25-2010, 08:12 PM Thread Starter
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yes sir....it will try to cool by adding fuel.....last resort is to shut rear cylinder off
Thanks. Do you know at what temp this occurs? And where the temp is measured? How do you know if your bike has this system?
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post #6 of 42 (permalink) Old 05-25-2010, 08:15 PM
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Hmmm this is very interesting. I have noticed lately (higher ambiant temps here in NY) that my 09 Fat Bob sometimes runs differently while sitting at real long traffic lights. The best way to describe what I am experiancing is that it seems like computer changes its programing and the motor runs differently. The tone of the exhaust also changes when this happens. I have been concerned about this and over the weekend I went on a 100+ mile ride with a guy that I work with. I pointed it out to him and asked him what he thought. He wasn't sure and suggested I call the dealer. As soon as I give it throttle it goes away. I have been wondering how to know when an air cooled engine is running hot. There are no temperature guages or lights that I know of, even if there were a light I don't think I would see it anyway. The warning lights are pretty dim durring the day time and are hard to see.
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post #7 of 42 (permalink) Old 05-25-2010, 08:18 PM
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'06 Dynas had it too. I don't remember the temps now but I had posted them a while back. It was in the owners manual. I don't have it with me now but if you need me to look it up let me know and I will.

90% of all statistics are made up.
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post #8 of 42 (permalink) Old 05-25-2010, 08:19 PM
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your fat bob probably has engine temp management enabled then....but you should still have it checked.....only takes a second with the digital tech

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post #9 of 42 (permalink) Old 05-25-2010, 08:21 PM
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i have never seen it on an 06.....only seen it on closed loop system which is 07 and up....

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post #10 of 42 (permalink) Old 05-25-2010, 08:22 PM
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It was said that the rpm's drop to 850 also but I found today that the rpm's remain steady at 1050. Also on mine there is no light or anything else to tell me it has "kicked in". It was also said the cruise light will flash/change color/come on. Mine doesnt. The engine just goes from thumpity thumpity thumpity to thump thump thump. As soon as I give it just the slightest bit of fuel it picks back up and runs like normal til I have let up off the throttle for a second or so. It will also activate while its movin as long as its at idle. This is with the clutch out, puttin at idle. Once again, as soon as you give it the slightest amount of fuel it goes back to normal.
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