Space Cadet

I have a b18 in my DA and it has a very high idle, like around 2300rpms. I messed with the idle adjustment screw on the throttle body and got it to drop to around 2000rpms, but then when I restart the car its back up around 2300 again. I have recently replaced my throttle postition sensor and idle air contol valve. What could be causing this?

Space Cadet

Nothing? Noone?

koss1229

Is it just constant 2300RPM idle? If so, then you have a vacuum leak. Spray some carb cleaner or starting fluid around vacuum lines and intake manifold to see if the engine reacts.
Also, search for IACV and stuff. Its all simple.

Mattb16teg

Seems you answered your own question, if you just replaced the TPS then you probably didn't adjust it correctly hence why it is reading high.
Loosen the Tps and move it until the idle goes back down.

Space Cadet

So is this safe to do while the engine is running?

Mattb16teg

Yes, just LOOSEN the tps enough where it has some play and you can rotate it. However since it appears you do not have Hondata or some type of management where you can simply see the %, try this out:

How to Test:
1. Plug the TPS harness into the new TPS.
2. You'll see three wires exiting the cars wiring harness that you just plugged into the TPS. Take a paperclip, straighten out half of it, and shove it into where the middle wire exits the harness. You'll feel it when the paperclip touches metal.
3. Hook up your mulimeter test leads - nice if you have alligator clips, positive to the paperclip, negative to any ground in the engine bay. Set your multimeter to the 20V position.
4. Turn you ignition key to the Acc position. Do not turn on the car.
5. Go back and check your mulitmeter. You should be seeing something in the range of .5V give or take a few tenths.
6. Now adjust - first, turn the throttle by hand to the WOT position. While holding it there, turn the TPS until you get a reading of 4.5V. This is your target reading for WOT. Tighten down the screws. Let go of the throttle and let it go to full closed. You should see something around .5V. The specified range in the Honda manual is .5V closed and 4.5V WOT. There's been debate on this forum whether to set using WOT or closed. I went with WOT. Fortunately my values ended up being exactly .5V and 4.5V anyway.
7. Congrats! You're done. Just reinstall your throttle body. Be sure to double check you have all the vacuum lines in the right places.