Axys tps/low rpm question

[mattiasaberg]

Hello!
I'm getting low top revs on my sled, only doing 7600 and boggs alot before getting there. We are basicly testing everything on the sled to sort it out.
The other day at the shop, after setting the TPS for the second time, I was about to set the idle revs down to 1800 insted of the 2500 it currently was running and suddently we got the first code since the rpm issue started. Trothle stuck etc.. the TSS had given up so i took it out and put stripes on it so the sled would run, I wanted to keep truble shooting. Sure enough, the sled fired rigth up, no starting issues, but the idle was about 3500 rpm.
I have now adjusted the idle back down to 1800 and my question is:

Why did it idle at 3500 and is it possible that my limited top rpm is due to a faulty set tps? even if we have adjusted the tps we did it before i adjusted the idle...

The sled is a 2016 axys SKS.

 

[richracer1]

Typically, if the sleds won't go over 7600-7700 or so RPMs, indicates a potential problem with the E-VES cable. Disconnect it from the actuator and pull gently. It could be broke and you nor the ECU will know it's broken. As long as the actuator is functioning properly, it will not set/show any codes. Personnaly, I'd just buy a new one and replace it unless it's already been replaced.


As for adjusting the TPS, make sure the throttle cable is disconnected from the flipper and the idle screw is backed off so it isn't touching the tab. Base setting has to be .700 +/- .01 VDC. Idle should be in the .94 VDC so it'll idle around 1700 - 1800 at operating temps.

 

[mattiasaberg]

Typically, if the sleds won't go over 7600-7700 or so RPMs, indicates a potential problem with the E-VES cable. Disconnect it from the actuator and pull gently. It could be broke.


Start looking for air leaks an/or any damage to the intake boots between the throttle body and reed cage.

Done that allredy.
I have done:
New pistons
Checked the e-ves cable
Sprayed starter spray by the throttle body
new relays x5
new converter
new spark plugs
new belt
new spring in primary
disasembled secondery and cleaned it.
checked the bearings
messured the pistons gap to top in the cylinder
TPS
new trothle cable.

 

[mattiasaberg]

As for adjusting the TPS, make sure the throttle cable is disconnected from the flipper and the idle screw is backed off so it isn't touching the tab. Base setting has to be .700 +/- .01 VDC. Idle should be in the .94 VDC so it'll idle around 1700 - 1800 at operating temps.[/QUOTE]

What would happen if the idle screw was touching? would it still be possible to get the "rigth" VDC in digital wrench?

 

[richracer1]

What would happen if the idle screw was touching? would it still be possible to get the "rigth" VDC in digital wrench?

If the idle screw is putting even the slightest of pressure on the tab, you will not get a proper base setting. The TPS is that sensitive. I do my own TPS adjustments as I do not trust the dealership to take the time to ensure it's done correctly.

 

[Teth-Air]

The bushings in the exhaust valves were worn out on mine. Lots of slop could mean they sit in different positions time to time. Also exhaust donuts are known to cause this problem if leaking. Check springs too.