S4 with poor hot idle

[gage]

TPS must be spot on 15omv its really critical a low revs  and the balance as well.....also tickover must be 1100-1150 minimum any less and it will run bad , also fuel filter must be clean and Iridium plugs help.The S4 does get hot in traffic .

+1

The proper plugs may be 30 bucks each but it is critical as is the the TPS. I have my idle set at 1200

[rule62]

Anybody ever make any headway with this?

Mine was TPS all the way.

[roy-nexus-6]

Wish I had found this thread earlier.

My S4 used to stall out at about 100C (212F). I had it adjusted at the 20K service... and it got worse: starting stalling at 75C (167F), which made low speed cornering damn dangerous.

Last week, I removed the crankcase breather and fitted a KT filter from TPO parts. I was testing the system... and noticed that my bike wasn't stalling anymore... quite happy to go up to and above 212F.

I have no idea why.... 

[djrashonal]

I'm having the same issues. Just had the TPS reset about 50 miles ago and it's stallin sitting in traffic at around 1k rpm........ anybody figured this out yet?

[ducpainter]

I'm having the same issues. Just had the TPS reset about 50 miles ago and it's stallin sitting in traffic at around 1k rpm........ anybody figured this out yet?

1K is a little low for a Duc to idle.

can you get the idle speed set to about 1200?

[Speeddog]

@ djrashonal

Try opening the air bleed screws a 1/4 turn at a time until you get idle up to 1200 or so.

They usually won't idle reliably at 1000.

[djrashonal]

thanks guys! i'll try that today!

[monkfood]

Athough this topic is rather old i want to give it a try and bring it back to life since i experience the same issues.
I also have a S4 with a Termignoni (stock ECU)

There are moments where she idles perfectly at 1100-1200rpm without a hand on the throttle. As soon as she gets hot one of the cylinders starts dying.

Tried the Air Bleed screws today but the idle did not really change. i even had them out by 4 turns. No effect, thus put them back to 2 turns out.

Next thing is reset TPS and syncing the TB.
Does anyone have new suggestions than what was already discussed above?

[jerryz]

as has been said before TPS is really reallly critical and set for 1200-1300 rpm ,,, my S4 ticks over sweetly hot or cold but a PC3 and custom maps does help especially in the region from 1000rpm -4000rpm

[monkfood]

as has been said before TPS is really reallly critical and set for 1200-1300 rpm ,,, my S4 ticks over sweetly hot or cold but a PC3 and custom maps does help especially in the region from 1000rpm -4000rpm

Thanks Jerryz, i checked the TPS and the reading said 230mv. Did the adjustment to 150 and will go for a test now. Actually the first test start in the garage did not sound much better than before   . Idle is at 1100-1200 but it does not seem to change when changing the air bleed screws. i guess i will have to do that electronically.

As for the PC3, i thought about getting one, but i think i will go for the Rexxer now i hope that will do the trick. And of course the TB sync.