Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Sport Touring: ST4 / ST3 / ST2 > ST4s idle settings

[jerryz]

The TPS is a very difficult thing to get exactly spot on it often moves when the screws are retightened .Check and check again.

[nelly]

The ST4 uses the non linear TPS. You can't reset it in software. That function is for the linear TPS used on 749/999 etc. It's a function that shows up in VDST because of the 5.9 ECU being used.
The extra click on the mixture have probably given you the improved running. The TPS reset could/will have thrown it out.
Only way to set it is with closed butterflys and the 150mV setting.

[jerryz]

I have been thru all this with my S4 and have cured all poor running problem by using a PC3 with termis and airbox mods then setting up and writing a series of custom maps , I now have a perfect tickover with easy running at low revs and great transitions to mid and onto the rev limiter , there are no glitches at all and around town the bike runs smooth as silk at 30mph in 4th gear .
I find that the TPS is most critical of all service jobs even if valves and balance are perfectly set the TPS is more critical for perfect smooth running .I check it now at 2 monthly intervals as it goes off very subtlely .