This is what I got from:
http://www.hondaswap.com/~pills/obd1guide.html
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After performing a swap, many times the throttle position sensor on the engine is broken, forcing you to use one from your old d15 or d16 (or whichever you pulled). The Honda TPS has three wires coming from it: green/white , a red/blue , yellow/white. Your primary focus will be on the red/blue wire, as this is the one that sends a voltage to the ECU telling it how open or closed your throttle is. The ECU expects .5 volts to be closed throttle and 4.5 volts to be Wide Open Throttle (WOT). The red/blue wire goes to pin D11 at the ECU. Rotating the TPS will change the voltage, when you take it off, you'll notice that the holes are slotted so it can move. If you are fortunate enough to have Hondata Datalogging or an Apexi V-AFC you can use their inbuilt functions to read the TPS voltage. If you do not have such a device, you can use a Voltmeter or similar device. Ground one lead on the chassis somewhere and use touch the (+) lead to the pin on the TPS (should be the center pin) and measure the voltage. Rotate it until it reads .5 volts, then tighten it down. Have a friend press the gas pedal to the floor and also check that WOT reads 4.5 volts.

For those interested with the other two leads, and I know there has to be someone out there. The green/white wire ties into a braided wire with the Intake Air Temp Sensor and the Heated Oxygen Sensor and they all run to Pin D22 on the ECU which is a sensor ground that reads less than 1 volt while the car is started. The yellow/white wire goes to pin D20 on the ECU which is a reference voltage, where it gives about 5v with the Key on and engine off.

And from http://www.integra.orcon.net.nz/tps

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After doing this I noticed my idle wasn't quite right. The Honda manual I have says 0.45V but when I measure my stock TPS which was still set from the factory it was 0.32V so that is what I have mine set to. Once I had it set to 0.32 the idle was fine.

If you know someone with the same car you could measure their closed throttle voltage to see what their car has but try setting to 0.45V first. I suggest you measure your stock TPS setting before moving it so you can at least revert back to the original setting. There may be other Hondas which have settings other than 0.45 volts,

And from the str web site http://www.strpower.com/Inst/TB/strtb.html
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On the factory TPS sensor, there are 3 wires. The center wire is “regulated voltage”. At CLOSED
throttle check the voltage reading of the center wire. The reading should be between 0.36 - 0.44 volts. Rotate the sensor clockwise or counter-clockwise until the reading falls within that range. Tighten the two screws. At WOT, the reading should be between 4.50 - 4.85 volts. Make adjustments as necessary

From a guy on HT at http://www.honda-tech.com/zerothread?id=844535
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When the TB is closed it should be as close to .5 Volts as possible (Helms). Now on the STR site they are saying it should be between .38 and .44 volts. This is where I'm on the fence. I don't know who's to go with......

**this one above is the one that cited the helms as beiong as close to .5 as possible...this is the one that sparked my attention**




And from hondata themselves...http://www.hondata.com/techidle.html

The TPS tells the ECU what position the throttle is in. The TPS should read 0.45V when the throttle is released. It is critical that the TPS is adjusted correctly so that the ECU knows when the throttle is released, which tells the ECU that the engine is either idling, or the throttle is closed under load and the injectors should be switch off the save fuel (fuel over-run cutoff). Swapping ECUs that have different internal power supply characteristics can change the TPS voltage a small amount - in some cases enough to put it above 0,5V.



If the TPS is set negative (below 0.45V at idle) when you open the throttle slightly the ECU will think the throttle is not open, apply the fuel over-run routines and cut fuel at 1400 or 1800 rpm. This will often cause the revs to cycle between about 800 and 1800 rpm. Also the car will be jerky when driving around at low speed.

If the TPS is set positive (over 0.45V) then the fuel over-run routines won't work, and also the ECU will not run the correct idle routines to keep the idle steady. It's better to have the TPS adjusted slightly negative, but setting it to 0% if fairly easy with datalogging. Otherwise aim for 0.45V.


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Ok now the hondata seems to clear up alot of questions on why the idle is rough due to not running the fuel over-run routines to keep the idle steady..

But if this were the case then Why would honda set a stock tps at .49??
Are the tps voltages that control the fuel over-run routines ecu specific?
hmmmmm :thinking: