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post #1 of 37 (permalink) Old 01-19-2015, 03:05 PM Thread Starter
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High idle -- help

I have a 2007 Honda CBR 600rr and I am having idle issues. I was recently riding along this past fall and I noticed, when I came to a stop light, that my bike felt like a fuel pump was going out and the bike wanted to die. I took off and when giving the bike gas it felt fine. A few minutes later I noticed the idle was stable but abnormally high (2,100-1,900rpm). Unfortunately my bike has been this way for a few months now with no known fix. It still idles at about 2000 rpms and I notice when shifting that there is a hang in the engine rather than the engine instantly dropping the rev like normal. In an attempt to fix this problem I have changed the IAT sensor, put a new K&N air filter on, and attempted to reset the ECU by leaving the battery cables unhooked overnight. Any further ideas or help to remedy this issue would be greatly appreciated!!

Last edited by CQualls140; 01-19-2015 at 03:14 PM.
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post #2 of 37 (permalink) Old 01-19-2015, 10:04 PM
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any other mods?
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post #3 of 37 (permalink) Old 01-20-2015, 12:30 AM
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Was any work done on the throttle cables or throttle bodies recently?

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post #4 of 37 (permalink) Old 01-20-2015, 10:49 AM Thread Starter
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any other mods?
Only mods done to this bike is a slip-on exhaust.
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post #5 of 37 (permalink) Old 01-20-2015, 10:51 AM Thread Starter
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Was any work done on the throttle cables or throttle bodies recently?
Not to my knowledge no. I played with the throttle cable by the gas handle to make sure it was on properly and it was.
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post #6 of 37 (permalink) Old 01-20-2015, 11:06 AM
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Only 3 possibilities I can think of are:
1 glitch causing the ecu to think the bike is always stone cold.
2 idle air control valve on the throttle bodies
3 throttle cable doesn't have enough free play and is adding just enough throttle to add 500 rpm.

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post #7 of 37 (permalink) Old 01-20-2015, 12:02 PM Thread Starter
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Originally Posted by cbrkat28 View Post
Only 3 possibilities I can think of are:
1 glitch causing the ecu to think the bike is always stone cold.
2 idle air control valve on the throttle bodies
3 throttle cable doesn't have enough free play and is adding just enough throttle to add 500 rpm.
1) Is there anyway to reset the ECU? I tried unhooking the battery and left it off overnight in an attempt to reset it but I cant be sure if it worked or not.

2) I need to check into this

3)I played with the tension and this doesnt seem to be the problem.
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post #8 of 37 (permalink) Old 01-20-2015, 12:44 PM
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When is the last time that the spark plugs checked? if the throttle cable looks good, might want to check your fuel system as well. A lean or rich motor would explain the low and high revs, but what is causing this could be a larger list.

What was the last thing that you did to the Bike prior to the issue? oil change, coolant flush, etc.

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post #9 of 37 (permalink) Old 01-20-2015, 12:49 PM
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Mine did that. Then on the way to change to oil. It dropped back to normal. It made me think maybe fuel injectors were somewhat clogged. Bad gas?
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post #10 of 37 (permalink) Old 01-20-2015, 02:11 PM
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Quote:
Originally Posted by CQualls140 View Post
2) I need to check into this
If it hasn't been messed with, it's honestly best to leave it.




Quote:
Originally Posted by Jericho87 View Post
When is the last time that the spark plugs checked? if the throttle cable looks good, might want to check your fuel system as well. A lean or rich motor would explain the low and high revs, but what is causing this could be a larger list.

What was the last thing that you did to the Bike prior to the issue? oil change, coolant flush, etc.
The ecu will run it rich IIRC if the MAF or MAP sensor (can't remember) indicates it's cold out...2k is what mine starts at then drops to ~1500 at around 143F

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post #11 of 37 (permalink) Old 01-20-2015, 03:16 PM
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The ecu will run it rich IIRC if the MAF or MAP sensor (can't remember) indicates it's cold out...2k is what mine starts at then drops to ~1500 at around 143F
Yea I didn't want too get to crazy if it was something simple like plugs or injectors (not all that simple). But I agree, there could be an issue with engine temp sensor or the MAF. I had something similar happen to my GTO and it was a broken engine coolant temp sensor causing the computer to run weird.

I was hoping he would say, " Oh I just did xyz to my bike" and see if that spurs any potential causes/easy fixes.

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post #12 of 37 (permalink) Old 01-20-2015, 03:55 PM
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Yea I didn't want too get to crazy if it was something simple like plugs or injectors (not all that simple). But I agree, there could be an issue with engine temp sensor or the MAF. I had something similar happen to my GTO and it was a broken engine coolant temp sensor causing the computer to run weird.

I was hoping he would say, " Oh I just did xyz to my bike" and see if that spurs any potential causes/easy fixes.
If the fan kicks on at 220 and the thermostat opens at 180 I don't think it's a temperature sensor, leaning towards the MAF because air is more dense at lower temps and unless extra fuel is added it leans out...I'm noticing more and more threads like this, maybe they were always there, but nevertheless. Also what I mentioned previously was just potential parts that could have that result...not that there is an issue with all of them, or possibly none...idk for sure.

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post #13 of 37 (permalink) Old 01-20-2015, 07:02 PM Thread Starter
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As I was searching for more answers I found this thread from this very forum that states my problem with perfection. It seems as if I am not the only one having this problem and it does not seem that anyone has a fix for this.

Older post that describes my issue better than I did: https://www.600rr.net/vb/showthread.php?t=255425
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post #14 of 37 (permalink) Old 01-20-2015, 08:05 PM
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Called it...correct air temperature isn't making it to the ecu.

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post #15 of 37 (permalink) Old 01-20-2015, 08:12 PM Thread Starter
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Called it...correct air temperature isn't making it to the ecu.
SO do I need to change the MAP sensor? or MAF sensor?
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post #16 of 37 (permalink) Old 01-20-2015, 08:22 PM
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Potentially, I'm still figuring out what their Achilles heel is, no way so many people can have almost the exact same symptoms of a problem and the design of the part involved not have anything to do with it so instead of spending more on replacing parts see if they can be cleaned....my theory is they are getting clogged from either debris getting past the air filter or possibly oil from the engine making it up the breather since that does feed into the air box as well

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post #17 of 37 (permalink) Old 01-21-2015, 08:44 AM
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Potentially, I'm still figuring out what their Achilles heel is, no way so many people can have almost the exact same symptoms of a problem and the design of the part involved not have anything to do with it so instead of spending more on replacing parts see if they can be cleaned....my theory is they are getting clogged from either debris getting past the air filter or possibly oil from the engine making it up the breather since that does feed into the air box as well
Agreed, If the sensor is dirty it could be reporting the incorrect values to the computer causing the issue. I would think that its time to break it down, give it a good cleaning.I did a quick search and found the air temp sensor for sale its only like $20.

http://www.motosport.com/motorcycle/.../37880-p05-a00

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post #18 of 37 (permalink) Old 01-21-2015, 09:00 AM
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Sorry about the multiple posts, but I did some more searching. Well, along the same lines, if your IAT doesn't fix the problem, maybe look into this. I was looking at our throttle body assembly, and it looks like there is a Idle Air Control Valve. See Below:

http://www.motosport.com/motorcycle/.../throttle-body

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post #19 of 37 (permalink) Old 01-21-2015, 01:40 PM
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Sorry about the multiple posts, but I did some more searching. Well, along the same lines, if your IAT doesn't fix the problem, maybe look into this. I was looking at our throttle body assembly, and it looks like there is a Idle Air Control Valve. See Below:

http://www.motosport.com/motorcycle/.../throttle-body
I think I mentioned that at the beginning as being a possibility.

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post #20 of 37 (permalink) Old 01-22-2015, 07:09 PM Thread Starter
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Yes it has been mentioned..

I wanted to take a second to thank you for all for the help. I am going to break into it this weekend and see what I can come up with as far as cleaning some sensors. When I replaced my air filter it was beyond ready for a new one so dirt in those areas is a definite possibility.
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post #21 of 37 (permalink) Old 01-22-2015, 07:47 PM
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Last thing I'll mention: on the throttle bodies there should be some screws that have a painted line going across, if the lines are straight it's not the idle air setting and I'd advise you to not mess with them any further.

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post #22 of 37 (permalink) Old 01-22-2015, 09:22 PM Thread Starter
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I will keep you all posted as to what I figure out this weekend. I will tinker with it and if the weather permits I will take it for a spin to see what happens and post results as I get them.
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post #23 of 37 (permalink) Old 01-22-2015, 11:08 PM
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I will keep you all posted as to what I figure out this weekend. I will tinker with it and if the weather permits I will take it for a spin to see what happens and post results as I get them.
If you can, a video of the gauges as it's warming up and then another once it's above 180F might be helpful if your microphone can pick up the engine...also, where in the world do you live?

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post #24 of 37 (permalink) Old 01-23-2015, 07:21 PM Thread Starter
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If you can, a video of the gauges as it's warming up and then another once it's above 180F might be helpful if your microphone can pick up the engine...also, where in the world do you live?
I just took the gas tank cover off and what not before I saw this. I will see what I can come up with though. I am from Lexington, Kentucky! My number of posts would indicate im a new member but ive actually been browsing this site for a long time.
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post #25 of 37 (permalink) Old 01-23-2015, 10:05 PM
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I just took the gas tank cover off and what not before I saw this. I will see what I can come up with though. I am from Lexington, Kentucky! My number of posts would indicate im a new member but ive actually been browsing this site for a long time.
I asked where you are in the world since I'm usually on the mobile app and I can't see that much info but if it's exceptionally cold the bike ecu may never bring the idle down, dust can clog stuff up, salted roads, etc...may seem irrelevant but these bikes aren't meant for going many other places aside from the track. The seat is my case in point.

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post #26 of 37 (permalink) Old 01-25-2015, 05:05 PM Thread Starter
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Last thing I'll mention: on the throttle bodies there should be some screws that have a painted line going across, if the lines are straight it's not the idle air setting and I'd advise you to not mess with them any further.



Where exactly are these painted lines?

EDIT: Nevermind I see them on the setting plate torx screws.

Last edited by CQualls140; 01-25-2015 at 05:28 PM.
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post #27 of 37 (permalink) Old 01-25-2015, 05:28 PM Thread Starter
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Last thing I'll mention: on the throttle bodies there should be some screws that have a painted line going across, if the lines are straight it's not the idle air setting and I'd advise you to not mess with them any further.
http://i57.tinypic.com/2pt6m3r.jpg

You can hardly see them on this picture but you can faintly see the paited lines on the IACV setting plate where the torx screws are. Do you think this rules out the IACV and leaves only the MAP sensor remaining?
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post #28 of 37 (permalink) Old 01-25-2015, 05:37 PM
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It rules out the IACV; those lines are there to set it back properly should they have to be rebuilt. If there's a way to digitally check throttle position then that'd rule out it not going completely back to idle, and that basically singles out the problem to being electronically related: and unless there's some part I've never heard of before it would have to be the ECU, or a sensor the ecu uses.

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post #29 of 37 (permalink) Old 01-27-2015, 11:23 PM Thread Starter
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Here is a vimeo link to the idle of my bike.. you notice that when I rev it it also gets slightly hung at the end. dont think that is supposed to happen either.

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post #30 of 37 (permalink) Old 01-27-2015, 11:28 PM
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Can't make out the temp gauge on my phone but if it was cold the rev-hang isn't so abnormal...you shouldn't do that BTW but that bike doesn't sound right...at least mine is much more steady.

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