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Throttle Position Switch adjustment subtlties 700

posted by  m rad on  Mon Mar 31 14:16 CST 2003
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last visit: Tue Mar 27 07:09 CST 2007
[RELATED]

1990 740 Turbo, 156k

My recent idle problems are mostly solved, having replaced the throttle position switch.

The idle is smoother now, with less "hunting" for the correct speed, but I now have hesitation when first pressing on the accelerator, a slight pause after which the engine runs just fine.

The Idle Air Control Valve and many other parts have been replaced during this recent tune up/resurrection (if curious, see post #http://www.brickboard.com/RWD/index.htm?id=605225 for details)

I believe that the TPS needs to be adjusted further, and I'm curious as to what the subtlties of this adjustment are.

When I installed the switch a few days ago, I rotated it (clockwise, from the face of the switch, if I recal correctly), and then rotated it counter clockwise until I heard a "Click." I then tightened it, I believe, close to this postion.

I see that the slots on the switch allow for a bit of rotational adjustment.

What is the desired location: the position just after the click is heard, or am I to rotate it further?

How subtle is this adjustment?

Is it a question of trial and error and fiddling until the hesitation problem goes away?

Finally, should I be attempting to set the base idle by grounding a connection of some sort? How is this done? I've seen conflicting info about this, some of which suggests the idle is not adjustable on this car.

Thanks very much in advance for any replies.





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