i've just put on a big bore throttle body on, and now my car idles at like 1500 rpm or has a spuratic idle that goes up and down. it won't sit in one spot. has anyone else had this problem? is my ecu reading to much air or something? please help me..anyone. thanks

Josh


[Modified by Jtsintegra, 3:20 AM 10/18/2002]

 

Did you check for vacuum leaks?


Rob

 

yeah, i've checked everything. theres no vacuum leaks anywhere...the map sensor is fine...all is well..i just can't figure out why its doing this. i have a P30 ecu..could it be bad? or not wanna register the overflow of air? the idle is fine with a stock TB though. that is what is weird.

 

Did you ... adjust the idle?

 

if your referring to the adjustment screw on the TB, yes i've played with it both ways and it did nothing for me.

 

There should be a big slotted screw to adjust the idle with on the TB. You did use a gasket on the TB to intake mani right? Also clean the screen on your IACV. MAke sure it's functional. If I remember correctly, the intake mani has channels that go from the IACV to before the throttle plate so that the IACV can control idle. Does the throttle body have ports in it to match the IACV channels?

 

how can u use the gasket wrong? it is a brand spankin new iacv. not sure if the channels match or what that means. can i adjust the iacv?? the thing is, it idled fine with the stock tb

 

Unplug the IACV and see if you can get a stable idle by adjusting the idle screw. If not... put the stock TB back on and call it a day.

 

i'm not putting the stock one back on, the performance with this thing is awesome. its just that it won't idle for me.

 

The IACV has to get air from before the throttle plate. So there should be a hole in your throttle body that matches up with a passageway in the manifold that goes to the IACV.

 

yeah, pretty sure that lines up. see what happens is that when the car is cold it idles fine..i can let it sit there and it will be good. but after i drive it for a little bit or beat on it, thats when it starts to idle at 1500rpm or be iradic.

 

Do you have an FIT valve or did you at one time and got rid of it?

 

what is a FIT valve?

 

Fast idle thermo, my 2nd gen 'teg has one. Not sure about later model Hondas. It's a valve that lets air in when the engine is cold. As the engine warms up, a piece of wax in the valve melts and closes the valve. It's under the throttle body, has a coolant in and a coolant out hose. Mine got jammed open somehow, had to swap it out.

 

did you try reseting the ecu?... reset it and then adjust the idle..

it should be fine afterwards

 

allready tried that. with the stock TB it is fine. when the car is cold with the new TB it is fine. just when the car is driven for a little while or is beaten on does the idle the go to 1500rpm

 

check that the tps is installed corectly. (throttel position sensor)