Speed Triple 1050 2010 idle problem - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 11 (permalink) Old 08-31-2019, 05:59 AM Thread Starter
Minitwins
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Hello,

The idle of my S3 1050 from 2010 is very 'jumpy' at random times. Doesn't matter if the bike is hot or cold. Sometimes the problem occures right after starting the bike, sometimes it doesn't happen at all.

I got the bike second hand since 2 months and the problem started the second day that I got it. The bike has a 3-1 arrow low boy exhaust with K&N filter and SAI is on.
I've used TuneECU to update the mapping (to #20539), it had an outdated 3-1 mapping on it (#20209) but this didn't fix the problem. Idle is set to I believe 1400 rpm but it is never steady, it always jumps around 1100-1450rpm and at random times when nearing lights or roundabout and pulling the clutch, it drops to 800 and sometimes even stalls.

I've done the TPS and idle test in TuneECU. The TPS is set to 0,63v (0,60v ideal) and increases gradually as it is supposed to on opening the throttle. Once the idle test starts however, the bike starts making it noise (i believe this is the stepper motor) and shows 0,77v (0,75v ideal). But now, the pitch of the noise changes and once this happens the idle voltage drops to 0,60v and up to 0,78 and keeps jumping around. I don't think this is supposed to happen..?

Does anybody have an idea of what the problem could be here? What sensor does the stepper motor use to get it's position from? I will try to use the 'reset adaption' function from TuneECU this afternoon and will update this post after.
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post #2 of 11 (permalink) Old 08-31-2019, 03:19 PM
SuperBike
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The idle set point is 1200 rpm when hot.
The more obvious: you may either have a TPS (throttle position sensor) problem or too much play between the stepper and the throttle cam.
Alternatively you may have another faulty sensor like absolute pressure manifold sensor (MAP I think) or one of its hose.


Edit: It's the TPS that gives the ecu the throttle position. The stepper moves the throttle via a cam. But by nature the stepper self calibrates and knows were it is. You have noted it self calibrates a few seconds after you turn the key off (hissing).


I guess you read this thread.


Fred

Last edited by fredsprint; 08-31-2019 at 03:25 PM.
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post #3 of 11 (permalink) Old 09-01-2019, 04:30 AM Thread Starter
Minitwins
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Quote:
Originally Posted by fredsprint View Post
The idle set point is 1200 rpm when hot.
The more obvious: you may either have a TPS (throttle position sensor) problem or too much play between the stepper and the throttle cam.
Alternatively you may have another faulty sensor like absolute pressure manifold sensor (MAP I think) or one of its hose.


Edit: It's the TPS that gives the ecu the throttle position. The stepper moves the throttle via a cam. But by nature the stepper self calibrates and knows were it is. You have noted it self calibrates a few seconds after you turn the key off (hissing).


I guess you read this thread.


Fred
Thanks Fred! I'll check the thread you linked and try to adjust everything accordingly.
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post #4 of 11 (permalink) Old 09-01-2019, 04:01 PM Thread Starter
Minitwins
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Update:
So I've adjusted the TPS and ISCV trough TuneECU "Adjust ISCV". The TPS was at 0.61v so I didn't touch it. The ISCV was at 0.78v which should be OK but I've set it to 0.75v just because it was easy to reach. The problem did not go away, nothing changed.

One thing I've noticed is that when I set the ISCV to 0.75v, the gap is about 0.7mm instead of 0.5mm

After adjusting the ISCV I've reset adaption and let the bike run for +- 10 minutes. While resetting and also after resetting, the rpm keeps jumping between 1200 and 1400. It's never steady.

Also, in the diagnostics tab of TuneECU, underneath 'throttle' it shows the number 16,9 (what does this number mean?) and the voltage says 0.69v even though the TPS is set to 0.61v. Where does this 0.69v reading comes from?

Last edited by RoiiB; 09-01-2019 at 04:04 PM.
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post #5 of 11 (permalink) Old 09-02-2019, 06:22 AM
SuperBike
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If you hover slowly the figure w/ the cursor you should have a tooltip stating the meaning of it.


Fred
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post #6 of 11 (permalink) Old 09-05-2019, 10:25 AM Thread Starter
Minitwins
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Update:

I've replaced the spark plugs for new cr9ek plugs and remapped the bike with TuneECU multiple times, reset adaption, reset ISCV, new battery, cleaned air filter. No improvements whatsoever.

I'm beginning to think that I have a faulty stepper motor? I've checked all hoses but no leaks. The bike has stalled on me 3 times so far when the idle dropped to low when pulling the clutch..

Last edited by RoiiB; 09-05-2019 at 10:29 AM.
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post #7 of 11 (permalink) Old 09-06-2019, 12:27 PM
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@RoiiB sounds like you've eliminated spark, tune, battery and air. I'd balance the throttle bodies (use TuneECU), clean/replace throttle body cables and replace the TPS first. The stepper motor doesn't have anything to do with warm/hot idle.

'05 neon blue Speedy
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post #8 of 11 (permalink) Old 09-06-2019, 02:58 PM Thread Starter
Minitwins
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Quote:
Originally Posted by surya View Post
@RoiiB sounds like you've eliminated spark, tune, battery and air. I'd balance the throttle bodies (use TuneECU), clean/replace throttle body cables and replace the TPS first. The stepper motor doesn't have anything to do with warm/hot idle.
Thanks for your reply.
The throttle bodies right now show 610,620,630 pHa. Doesn't really need balancing I think? By throttle body cables you mean the hoses?

One thing I noticed is after adjusting the TPS to 0.60v. A couple of days later I rechecked the TPS and it was 0.65v, I haven't touched it in between these checks.

I'm planning on replacing the vacuum hoses etc.
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post #9 of 11 (permalink) Old 10-14-2019, 01:19 PM
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Did you have any luck with vacuum hoses? I'm experiencing the same issues with my 2006 and I'm about at the end of my patience. It seems like an all too common issue with these bikes. My TPS voltage also jumps randomly. After I set it, the bike runs fine for a while and then the symptoms come back. When I check TPS, it will be off +- .08 from when I set it last. Frustrating!
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post #10 of 11 (permalink) Old 10-14-2019, 01:55 PM
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