idle adjust ....

[mpower76]

Dear Jeroen...

When I short circuit all 3 wires of the TPS, the engines's idle go up... 1200-1300 rpm....

i've screwed clockwise the master idle screw between 3° and 4° cyl but engine's rpm are 1100...1200.. (the tps is disconnetted and short-circuited)

I've a doubt!

i must adjust the idle 880 +- 50 rpm by adjust the 4 screw with vacuometer (300 +- 50 mbar) (tps disconnected) ? or

only adjust the vaccum (at for example 270mbar) and adjust the idle with master screw at 880 --50 with tps connected?

it's normal that the engine's idle go up?

Thenk you!

[Jeroen]

I've never really tried what change disconnection and short-circuiting the TPS made for me but with a warm engine the difference isn't supposed to be that much. This means idle is set too high (with the big copper screw between the throttle bodies of cyl 2 and 3).

The procedure is as follows:
Set idle CO, adjust idle revs, check co and if necessary re-adjust idle
Then adjust the throttle bodies vacuum, in the end check CO and idle rev count again

So idle is set with the big copper one, not with the vacuum adjustments!

[hardtailer]

Dear Jeroen...

When I short circuit all 3 wires of the TPS, the engines's idle go up... 1200-1300 rpm....

i've screwed clockwise the master idle screw between 3° and 4° cyl but engine's rpm are 1100...1200.. (the tps is disconnetted and short-circuited)

I've a doubt!

i must adjust the idle 880 +- 50 rpm by adjust the 4 screw with vacuometer (300 +- 50 mbar) (tps disconnected) ? or

only adjust the vaccum (at for example 270mbar) and adjust the idle with master screw at 880 --50 with tps connected?

it's normal that the engine's idle go up?

Thenk you!

it could be that your throttle plates need to be adjusted. Perhaps they are a little too wide open.
it's done like this: