Idle Surge Only After Cleaning Throttle Body

[Dekorum]

After cleaning my throttle body while on the motor with carb cleaner spray (it was thick with black carbon as well as inside the manifold which I also attempted to clean), my car would not start. I soon realized that I sprayed too much inside the manifold and the spark plugs got all wet and dirty with carbon. I cleaned them off with the carb cleaner (by the way, I replaced my plugs with brand new NGK PFR7G-11S plugs a few weeks ago so does this mean that I kind of messed them up permanently?) and then my car finally started. Now I have a crazy idle surge from 1k to 2k, does anyone know what I messed up?

Attached is my datalog. Is the PA sensor supposed to be remain at 101.6 kPa? I am starting to wonder if I messed up my MAP sensor by spraying it with carb cleaner. Also, in the datalog I messed with the IACV duty cycle and moved it from normal (where I had it previously) to the lowest setting to get my idle to stay steady but it is still well over 1k.

I am using an S300 in a P28 ECU in my EG hatch. I have a 96 spec JDM B18C Type R, stock with bolt-ons.

[Spunkster]

remove the idle controller and clean it and make sure that when inergized by a 12 volt battery that the solenoid is actually moving.

[Dekorum]

Today, I removed the IACV and the TB off of the motor and cleaned them both (I removed the MAP sensor but left the TPS on the TB because the gasket was a little cracked when I took the sensor off). First with water and simple green and a brush, then when they were dry I cleaned them with carb cleaner. I put everything back, replaced the TB gasket and the IACV gasket with new OEM parts, and I am having the same problem. High idle that bounces from 2k to 1k, but this time it is slower and sometimes stays at 2k longer. As the car warms up it mellows out a little bit but not much. When I disconnect the IACV, my idle is steady at about 1200-1500 RPM.

I don't understand why I am still having this issue when I did nothing but clean the TB and the IACV. Two weeks ago my idle was perfect before I cleaned them. Do I need to keep the IACV disconnected and adjust the idle screw on the TB until the idle is around 400-500 RPM? I have already done that in the past around 2 years ago, so I am not sure if the screw could got readjusted over time.

Do I need to calibrate the TPS since I removed the sensor and looked at the gasket, then put it back on?

[Spunkster]

YEs the TPS will have to be calibrated and you should also replace the map sensor o-ring if it is cracked and old.

[Dekorum]

I will calibrate it today. I need to find some pins that go into the connector to read the voltage while it is connected. Where would I find something for that? Calibrate it to 0.48V closed and 4.5V WOT?

Also, the o-ring for the MAP sensor did not look cracked. Should I still replace it? My TPS sensor gasket is cracked on one side, so I am afraid to take it completely off and I can't seem to find a new one. Does Honda/Acura sell a new gasket for the TPS?

[Spunkster]

No they do not sell a new gasket, only a whole new throttle body. You may have to make your own gasket.

You can use the software to get the tps to read as close to 0 when calibrating as well.

[Dekorum]

Will paper clips fit in the connector pins?

Also, can you explain how to use the software for better calibration?

How do I know if I need a new gasket, and how do I make one?

[Spunkster]

Information on calibrating the TPS can be found at http://www.hondata.com/help/smanager/tp ... ghtsub=tps

IF it is cracked it should be replaced. You will have to cut the correct shape out of gasket material purchased from Autozone.

[Dekorum]

Calibrated my TPS. I don't think the gasket is affecting anything. It seals pretty well.

I think the problem may be my IACV. It somehow may have broken due to cleaning. It doesn't seem to close all the way. I think I can tell because when I decrease the IACV duty cycle on S300, the idle drops to around 1400 and does not surge any more.

Do you think my plugs should be replaced after I got them really dirty with carbon and cleaned them off?

[Spunkster]

Step one is to resolve the iacv issue. If it runs fine after that don't worry about the plugs.

[98preludeJRSCh22]

go to MISC in the peremeters tab and either turn on the purge valve invert or turn it off . i had mine inverted and it started idling like yours. turned it off and it idle went to 900 and didnt move.

[Dekorum]

What does the purge valve inlet do? I see that Smanager mentions some OBDII cars. My car is OBDI (P28) but I am using an OBDII engine harness.

Also, I have not had a chance to tackle this possible IACV issue yet. I have been busy and not able to find another used IACV, but for now I have turned the duty cycle as far down as S300 will let me and it idles more constant but still higher than usual. One test that I have done is tried to plug the hole that leads to the IACV in the throttle body with my finger (the one in front of the throttle plate) and the idle does not change. If I push on the throttle plate to push it more in the closed position, the idle does drop a little bit. This is strange to me, because if the IACV was the problem then wouldn't it fix itself if I blocked the air hole to let IACV air bypass the throttle plate?

[Dekorum]

I got an IACV off a 98 Integra LS from the junkyard (according to the Acura part numbers all 96-01 Integra IACV should be the same). Unfortunately, the Denso sticker is worn so I can't verify that it says 6TA on the second row of numbers. The inner diameter of the left air hole is a little smaller on the one I got from the junkyard. I cleaned it and put on a new gasket, and my car now runs the same from the "normal" to all the way decrease of the IACV duty cycle. It is still idling high, at like 1500 RPM. So with my old IACV, my idle was steady at 1500 RPM only when the IACV duty cycle was all the way decreased and it was surging on normal. Now with the new IACV, the idle is steady at 1500 RPM anywhere from all the way decrease up to normal, but when I increase it more it begins to surge.

Also, as the car was warming up I noticed the idle surged a little bit even though the duty cycle was normal.

I do not know how to fix this idle problem. Something is telling me it is not a problem with my IACV. This problem only began once I cleaned my throttle body while on the intake. Maybe I got something lodged in the intake that I have not been able to get out?



You see how the diameter of the air hole on the left is a little larger (on the left IACV, which is off my 96 JDM Integra Type R motor).

[Spunkster]

If you unplug the iacv while the car is running does it change the way the car idles?

[Dekorum]

I hear the sound of the IACV valve closing, but it does not change the idle much. It is still at around 1500 RPM. I was able to turn the idle adjustment screw on the throttle body. I tried to adjust the idle to around 450 RPM with the IACV unplugged (like we are supposed to set our idle) and I cannot get the idle down past around 1300 RPM no matter which way I turn the screw.
I also sprayed carb cleaner around the intake and I did not hear an idle change. The idle does change when I push the throttle bracket closed. Even without the throttle cable connected, it idles the same. It decreases a bit when I push the bracket closed.

http://www.youtube.com/watch?v=uEDUb5OjEL4