High idle - TPS?

[Working_ZS]

Originally Posted by Lukas

I wonder if it adapts itself?

I would suspect that it calibrates at each key on event, similar to what many cars do. This would help the ECU to adapt as the TPS wears over time, until such time as it simply can't make heads or tails of what the signal from the TPS is saying, which is when it would throw a TPS trouble code.

The thing is, Charles only has an O2 sensor trouble code - nothing about the TPS, plus his TPS voltage graphs look good (virtually identical) at normal and high idle. I think that his TPS is OK, the issue is in the O2 circuit; either the wiring, connector, or the sensor itself.

[Working_ZS]

Originally Posted by Lukas

This description shows that it was ok then until it warmed up and now it was also ok until it warmed up I also looked at this log file from 20 min and the throttle position and it is 0.2% and on this 5 min log file it is 1.5% too bad the cable came unplugged because it would be known if this position changes as the temperature increases and now the question is if it is the short circuit and temperature that causes it to increase or if there is a leak somewhere and as the metal expands more left air gets in.

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Yes, two equal length logs would definitely help - say 15 minutes each. That way we can compare apples to apples, so to speak.

[Lukas]

I checked on this log file that charlie posted a dozen days ago and on it you can see that the throttle position increases as the motorcycle warms up.

[Lukas]

the position is wrong, it should be zero and it increases with the temperature change

[Lukas]

Charlie unscrew the TPS from the throttle, but don't unplug the plug and see how much it shows in the program, if 0 it's a throttle problem, if above zero now it's 1.5%, it's probably a short circuit or electrical harness , or ECU do that and we'll find out.

[Lukas]

If you unscrew it on a cold engine and manage to keep it out of adjustment and it is still in the 0 position then in the software you will be able to see if the throttle position changes as the temperature rises, it shouldn't because the sensor isn't screwed on I just don't know if you can keep it out of adjustment ideally you would have the hod ecu hacker on while unscrewing to see if it is 0.
When you fire up the bike and it starts to warm up, if the TPS starts to change values by some miracle then you know it's something with the electrics, and if the TPS doesn't show then screw it on and see if it starts to show 1.5 like it does now that would mean something is going on with the throttle as it warms up.

[Lukas]

check loose throttle cable.

[ChopperCharles]

Sigh. it's not a loose throttle cable.

[Lukas]

Before you do that you should try to adjust the throttle on a warm engine with this screw then wait for it to cool down and see if it is ok.

[ChopperCharles]

I've already replaced the TPS with a new one, and it is still doing this.

I don't understand your logic on how you get to "problem solved".

Charles.

[Lukas]

The hod ecu hacker program shows that you change the position of the throttle as the temperature increases, warm up the motorcycle and loosen the screw slightly, mark it as originally set in case of emergency.

[ChopperCharles]

Loosen what screw?

Charles.

[Lukas]

this screw adjust throotle position do this with hud ecu hacker on to see position

[J4Fun]

In post #88 the idle screw that Lukas points out there is a spring behind it and that's why I was wondering if your throttle snaps back. That could be the cause of a fluctuating idle?

[J4Fun]

One other thing here, if you like to jump on the throttle it can bend the tang on the return spring I mentioned. Meaning that bend could cause a loose return to idle? Thinking out loud.