Streetfighter 1098S idle speed issues - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 20 (permalink) Old Feb 16th, 2017, 5:10 am Thread Starter
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Unhappy Streetfighter 1098S idle speed issues

Hello everyone! I will try to explain everything as well as I can due to English is not my native language. If there is something I do not explain well tell it to me and I will explain it again...

1- I bought my bike with 31000kms and it was working perfectly at that time.
2- After a couple or three weeks, the idle speed started being variable and very high. After filling up the gas tank... problem solved . Just one day with that idle speed issues.
3- I had no more problems with the bike until a couple of months ago (I have been riding like 2 months without problems). Idle speed issues again: very variable and very high. Sometimes idle speed is OK at approximately 1400RPM but most of the time it is around 2000RPM and sometimes it has peaks up to 2600RPM. Yes, it is crazy.
4- After explaining this problem to the former owner, he told me that the bike did not pass the 24000km revision (or 2 years), so the valve adjustment was not done... So I took the bike to my trust workshop and he did the valve adjustment and everything it needed (he also changed air filter).
5- Idle speed issues still there, so he changed my ECU with another ECU, reflash that ECU with a compatible map for my bike and voilà, problem solved, so he told me to pay a lot ($$$) to fix that definitely.
6- After reading a lot on this and other forums and the help of a lot of great people, I decided to do it myself as it was way cheaper ($). I bought a Ducati 1098 SBK ECU almost new as that bike was fitted with a termi system and the cables needed.
7- Once I had everything at home (yesterday) I first backed up my original ECU, then flashed the DP map and tested the bike. Still idle issues. I replace my ECU with the one I bought, remap it with the same DP map and... still idle issues.
8- And now I do not know what to do... this problem is making me ill...

Answering @idaka questions from the "ECU maps repository" thread:

Quote:
TPS-Reset done?
Idle speed is regulated via the IdleStepper.
Check, if something is leaky, and the engine gets "wrong" air.
Check with GuzziDiag/IAW Diag Airpressure/AirTemp/EngineTemp.
There are Air-Screws at the ThrottleBody, maybe,someone has changed here?
Regards
Yes, I did reset the TPS.
I do not know how to check if the engine gets "wrong" air. If it can be using GuzziDiag I will check it this afternoon after leaving work. The normal values are those that appear at the attached screenshot? I remember that my Throttle, after reseting, was set to 2.50º or 2.60º.
I do not know what are air-screws at the throttle body, I will do some research about it...

Thank you to all who provide some type of help in advance, I will appreciate it very much!
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post #2 of 20 (permalink) Old Feb 16th, 2017, 6:14 am
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Throttle value after reseting, 2.50º or 2.60º is ok.
The other values depend on your Environment.
Attached a pic of the airbox, with stepper and throttle.
Check for leaks at the yellow marks.
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post #3 of 20 (permalink) Old Feb 16th, 2017, 6:25 am Thread Starter
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Quote:
Originally Posted by idaka View Post
Throttle value after reseting, 2.50º or 2.60º is ok.
The other values depend on your Environment.
Attached a pic of the airbox, with stepper and throttle.
Check for leaks at the yellow marks.
Thank you, I will check it this afternoon...
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post #4 of 20 (permalink) Old Feb 16th, 2017, 7:32 am
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Check the TPS itself, left side of the front throttle body. They go bad, loose connections, gas leak from the throttle shaft, etc. Happened to me.

2010 SF, 2011 M796- wife's
A few other and many gone and still missed
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post #5 of 20 (permalink) Old Feb 16th, 2017, 7:39 am Thread Starter
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Quote:
Originally Posted by mojodog View Post
Check the TPS itself, left side of the front throttle body. They go bad, loose connections, gas leak from the throttle shaft, etc. Happened to me.
If it is the TPS itself, when connecting to GuzziDiag of JPDiag the value should change, shouldn't it? As I checked yesterday, the value was constant at 2.60º... If I am wrong tell me how to check it and today afternoon I will check it.

Thank you!
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post #6 of 20 (permalink) Old Feb 16th, 2017, 7:49 am
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My problem was intermittent, I found it because fuel was leaking out the TPS. I didn't have to check voltage. Do a search, I have pictures of the replacement procedure on the site. Eventually replaced the entire throttle body unit with a used 1098 unit because the shaft seal was leaking. So far 20,000 miles on it with no problems.

2010 SF, 2011 M796- wife's
A few other and many gone and still missed
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post #7 of 20 (permalink) Old Feb 16th, 2017, 11:00 am Thread Starter
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Quote:
Originally Posted by mojodog View Post
My problem was intermittent, I found it because fuel was leaking out the TPS. I didn't have to check voltage. Do a search, I have pictures of the replacement procedure on the site. Eventually replaced the entire throttle body unit with a used 1098 unit because the shaft seal was leaking. So far 20,000 miles on it with no problems.
Nice, I found the thread you started about the TPS. But I will first check for ECU errors, try to get info about all sensors and try to catch if there is some sensor failing. If that does not show me anything clear, I will get into air bleed screws as I have been reading that some users have had problems with idle speed and that thing solved the issue.

Do you know how to get easy access to that screws without dismount half of the bike?

Thanks!
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post #8 of 20 (permalink) Old Feb 16th, 2017, 2:49 pm Thread Starter
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Update 1

OK, after getting home I connected the bike again. Here is what I found out... I uploaded some videos to my Google Drive.

1- I connect bike and turn engine on. TPS seems crazy. I do not know if that fluctuation is normal but it does not seem to be... At second 31 I accelerate until second 41. Just a little bit to see how TPS reacts. At 1:27 I accelerate again and let the throttle go down by itself. I do it again at 1:34 and 1:40.

https://drive.google.com/file/d/0B8s...ew?usp=sharing

2- I reset TPS and it seems that RPM are now perfect.

https://drive.google.com/file/d/0B8s...ew?usp=sharing

3- I go out to fill the tank up with gas (I filled it up TWO days ago, I have only ridden 62kms -39 miles- and the yellow indicator has lit) and RPM go crazy again as soon as I get out of my garage. After filling up the tank, I stop an record another video. As you can see, RPM over 1650 all the time... At minute 1:04 I accelerate a little bit and stop.

https://drive.google.com/file/d/0B8s...ew?usp=sharing

4- Once at home and WITHOUT touching anything nor connecting anything to the bike goes up to 2200RPM.

https://drive.google.com/file/d/0B8s...ew?usp=sharing



This shit is driving me nuts... It seems impossible to fix. Its behavior is completely random. It does exactly the same cold and hot. Maybe RPM are perfect, then peak to 2200 or something like that and then stable around 1900...

And sorry about the video quality, I uploaded 1080 but now it is only 360...
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post #9 of 20 (permalink) Old Feb 17th, 2017, 2:20 am
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Just to clarify:

I have only ridden 62kms -39 miles- and the yellow indicator has lit

Your tank was full?
I ride 180-200km,until the yellow light comes on.
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post #10 of 20 (permalink) Old Feb 17th, 2017, 3:35 am
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I don't understand your post. 5 & 6. Did the mechanic fix it or not? Did he just claim he could fix it and you decided to do it yourself?

I certainly wouldn't have done anything with the ECU without being totally convinced I didn't have a vacuum leak between a throttle body and head or at one of the throttle shafts. Unless your bike has an ECU controlled idle air valve, the ECU would not have anything to do with since it couldn't put more air into the engine.

I try to be thorough. I rarely return to a thread. If you have a question for me, PM me.
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