tps evaluating for ii issues

[max]

See if you can open this one.
one click opens in separate window and second click enlarges the view.

This is a picture from ebay, i don't have this throttle body.



Thanks to the good advice from sportsterdoc i have labelled the hoses for clarity.

The hoses are devided in two groups; the yellow ones are vacuum for the evap system and the blue ones are connected to the Manifold Air Pressure sensor.

What may be interesting to do is disconnecting both yellow outside ones that are easy to get out.

I can start my bike with the hose disconnected and dangling free ( i have only one of these and no evap system ) and idle it with very little effect, hot or cold that is;
------------ my iacv will correct the idle rpm to maintain 1050.----------

If your bike does the same thing then the iacv is doing it's job, and normally that would be the case.
However if you have a low idle in progress, you unplug the two outside hoses and the idle rpm goes up that would mean the iacv is closed and by unplugging the hoses you bypass the iacv to try and help it by doing it's job to achieve 1050 rpm .

This should be easy to try, see if you can pull the hoses off and push them on only halfway to make it easy to pull them out.

The fact that you told us that the idle slowly comes back to 1050 could be that the valve has difficulty in opening and closing ( stuck ) and the ecm eventually gets the job done.

max