From a post by Richard Curtis to the  IMON list

How to adjust TPS on an XR:

--Get engine to operating temp.
--Turn off engine.
--Disconnect electrical connector at IAC.
--Set base idle to 900 rpm
--Reconnect electrical connector to IAC.
--Unbolt IAC to get to TPS.
--Connect jumper wire to green wire going into the TPS.
--Connect digital voltmeter to jumper wire; set DVM to 0-20 scale.
--Turn ignition to ON but do not start.
--DVM should read 1.0v
--If not 1.0v, loosen both Philips-head screws that attach TPS to throttle
body.
--Turn TPS slightly to achieve exactly 1.0v (some posts have suggested 0.9v
but mine runs roughly at that setting; mine is a 5-speed if that matters)
--Tighten TPS.
--Move throttle through full range. You shouldn't see any spikes. I think max
voltage at WOT should be around 4.5 (see Dave Compton's excellent web site at
TurboTekToys for exact procedures and readings)
--Turn ignition off.
--Reconnect IAC; be careful of gasket.

You're done. Idle should be smooth and consistent. If not, consider cleaning
IAC and/or EGR. If spikes in TPS readings, replace TPS.

Richard Curtis
Fairfax Station, VA. 87XR with good idle except after warm-up it's up around
1100. 
 

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