HELP!! High idle conditions, random
Elite HDF Member
Joined: Mar 2006
Posts: 4,722
Likes: 5
From: Biddeford, Maine
RE: HELP!! High idle conditions, random
ORIGINAL: dgriffith
I have repeatedly taken my bike in, 06 ultra, injected, back to 2 different dealers for the same problem, They say it would not do it for them!!!when the bike is cold it idles like it is supposed to, fast idle for 10/15 sec. then it idles down. when hot, after you start it, stop to get gas, go into grab all store, etc. when you start it, in neutral with clutch in, it will high idle or when you ride out of the parking lot and stop at the corner it will idle as high as 2.000. snapping the throttle and letting it snap back does not help. I never know when it will do it. I read in SERT manule that low/cranking speed can cause this. I desperate to get it fixed.Please tell me what do do to fix it. Dan
I have repeatedly taken my bike in, 06 ultra, injected, back to 2 different dealers for the same problem, They say it would not do it for them!!!when the bike is cold it idles like it is supposed to, fast idle for 10/15 sec. then it idles down. when hot, after you start it, stop to get gas, go into grab all store, etc. when you start it, in neutral with clutch in, it will high idle or when you ride out of the parking lot and stop at the corner it will idle as high as 2.000. snapping the throttle and letting it snap back does not help. I never know when it will do it. I read in SERT manule that low/cranking speed can cause this. I desperate to get it fixed.Please tell me what do do to fix it. Dan
Steve
Road Captain
Joined: Apr 2007
Posts: 600
Likes: 16
From: Arizona
RE: HELP!! High idle conditions, random
ORIGINAL: maineultraclassic
I had this happen to me on my '96 Road King, and it turned out to be the Head Temp. Sensor. If the Sensor goes bad, it will tell the ECM that it is like -100 degrees outside and make the ECM dump fuel to the motor to compensate and raise the idle. It is very sporadic and is hard to duplicate as it only does it when it wants to. The sensor for the '96 was $100 and was very easy to replace............on your '06 it is located right behind the horn in the front head. The service manual should have a diagnostic chart that you can check the ohm reading from the sensor to see if it's OK or not......or have the dealer check it for you.
Steve
ORIGINAL: dgriffith
I have repeatedly taken my bike in, 06 ultra, injected, back to 2 different dealers for the same problem, They say it would not do it for them!!!when the bike is cold it idles like it is supposed to, fast idle for 10/15 sec. then it idles down. when hot, after you start it, stop to get gas, go into grab all store, etc. when you start it, in neutral with clutch in, it will high idle or when you ride out of the parking lot and stop at the corner it will idle as high as 2.000. snapping the throttle and letting it snap back does not help. I never know when it will do it. I read in SERT manule that low/cranking speed can cause this. I desperate to get it fixed.Please tell me what do do to fix it. Dan
I have repeatedly taken my bike in, 06 ultra, injected, back to 2 different dealers for the same problem, They say it would not do it for them!!!when the bike is cold it idles like it is supposed to, fast idle for 10/15 sec. then it idles down. when hot, after you start it, stop to get gas, go into grab all store, etc. when you start it, in neutral with clutch in, it will high idle or when you ride out of the parking lot and stop at the corner it will idle as high as 2.000. snapping the throttle and letting it snap back does not help. I never know when it will do it. I read in SERT manule that low/cranking speed can cause this. I desperate to get it fixed.Please tell me what do do to fix it. Dan
I had this happen to me on my '96 Road King, and it turned out to be the Head Temp. Sensor. If the Sensor goes bad, it will tell the ECM that it is like -100 degrees outside and make the ECM dump fuel to the motor to compensate and raise the idle. It is very sporadic and is hard to duplicate as it only does it when it wants to. The sensor for the '96 was $100 and was very easy to replace............on your '06 it is located right behind the horn in the front head. The service manual should have a diagnostic chart that you can check the ohm reading from the sensor to see if it's OK or not......or have the dealer check it for you.
Steve
Thread Starter
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Road Warrior
Joined: Aug 2006
Posts: 1,440
Likes: 0
From: Columbus,Indiana/ Arecibo,Puerto Rico
RE: HELP!! High idle conditions, random
I have been taking notes while riding and I can predict when the bike will high idle!! After the bike is hot, no matter 5 or 50 miles, stop engine and let it heat soak for 3/5 min. start bike and ride 300 ft.or up to 1/4 mile then stop. Bike will high idle every time. But only once, after that it will never do it again to you let it heat soak.. Also I looked in service manual and I cannot find a procedure on how to check the engine temp. switch. Anyone know how??? Dan
Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
Likes: 7
From: Northeast Ohio
RE: HELP!! High idle conditions, random
If your SERT operates anything like the DTT I am running, here is what most likely is happening. After a hot soak, the Engine Temperature (ET)based Fuel Adder adds fuel to aid in hot starts. This is the same table that also adds fuel for cold starts. The Time based fuel adder table tells the ECM when to quit adding fuel , so between time and temperature, there should be a finite period of enrichment. The time based table is usually set at fifteen or 20 seconds (sounds just about right for a 1/4 mile or less). On really hot days, the ET based table is going to sense hightemps for a while and dump fuel. The Idle Air Control (IAC) is going to compensate by adding air to keep the desired A/F ratio, thus the high idle. I'll make a bet you dont notice it on 70 degree days, mostly on the really hot days. Find someone that knows the ins and outs of the SERT and they can fix it. This is NOT a vacuum leak or mechanical problem IMO. Hope this helps.
Cruiser
Joined: Nov 2006
Posts: 236
Likes: 0
From: CA
RE: HELP!! High idle conditions, random
My 07 SE Ultra does the same thing. Sometimes I'll come up to a stop and it will be idling at 2-3k rpms. Sometimes it will just die. Starts right back up but it's a PITA. I'm going to mention the cylinder temp sensor when I take it in.
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Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
Likes: 7
From: Northeast Ohio
RE: HELP!! High idle conditions, random
What you are experiencing coyotedata does sound more like an engine temp sensor, but the other fellas problem was just after start-up, not after riding for a while. I think they are two different problems.
Ultimate HDF Member
Joined: Feb 2007
Posts: 7,663
Likes: 7
From: Northeast Ohio
RE: HELP!! High idle conditions, random
coyotedata, your problem does sound like it could be the engine temp sensor, but sounds like a different problem than addressed here in that his is after startup, yours is after riding.