i have a civic 95 coupe d15b vtec swapped A/T, NO CEL.

the problem is when ajust the idle speed screw the RPM not seem to be adjusted even if i unscrew it all nothing happen.


any idea??

 

That screw doesn't do anything

 

the screw located on the throttle body next to the canister hose, is supposed to adjust the idle speed

 

your correct that is the idle adjuster however to use that you need to let the car warm up and then unplug the idle air controll on the throttle body. that was the ECU wont be able to control the idle speed and override what your trying to adjust.

hope this helps.

 

There is a procedure in the service manual, you can not just turn it.

 

ok, i will try again with the service manual procedure and doble check

 

You'll find a diagram in the FAQs sticky.

What exactly is your idle problem?

Does the CEL work?

 

ok, i'll look in the FAQ..

the problem is very low idle when the engine get operating temperature. when A/C is ON, the Rpm are 400, 500 when
A/C is OFF the Rpm are 200, 300 at idle.

yes my cel work's very well

 

Update:

Today I was bleeding the coolant system when finish I let the engine warm to operating temperature, when the low idle start I disconnect the ECT sensor and guess what, the idle go up around 1000 and the CEL apear.

Why if I disconnect the ECT the idle go normal

 

Stop randomly unplugging sensors and just set the idle speed as detailed in the service manual.

 

You can test the ECT sensor.

 

X2

 

i try to ajust the idle speed today, i turn on the car let it warm, then disconect EACV, turn the idle screw(but the idle speed not increase), turn off the car, connect EACV, take off the backup fuse..

the low idle speed still

 

Did you read the service manual diagram? You need to connect a tachometer to do the procedure.

 

Sounds like the idle screw hole might be plugged or somthing pull the screw all the way out spray come carb cleaner in the hole and then put the screw back in and then follow the Idle adjustment process you did today. good luck

 

Yes i read the service manual... i forgot write that sorry, but yes i connect the tachometer

 

ok.. give me 5 minutes, let me try that in a moment..

 

Other thing I have noticed is that my car is consuming coolant, i know honda are very delicate with the air in the coolant system, but today i bleed the coolant system and i fill up the radiator and the coolant reservoir this morning and the coolant reservoir now is empty

 

thats a whole othewr problem, I would fix the idel first then check for a leak.

 

What diagram did you follow? Describe the steps you took and what happened. Give details.

 

im having the same problem when i try fixing the idle surge problem im having. even if i take the screw all the way out it dont do anything.

 

i follow this diagram

i let the engine to warm ,connect the tachoneter, then disconect the eacv, when disconect the EACV the engine shut off, i start the engine and depress the pedal and put the rpm around 1000, when completely depress the pedal the engine shut off again, idle screw was completely inside and with the engine off i turn a little, then start the engine again and depress the pedal and put the rpm around 1000 when completely depress the pedal for let it idle the idle speed is around 100 :S, then turn the idle screw and the idle speed not rise more than 300 even if i un screw it all, then turn off the engine, connect the EACV and restart the ECU(Remove the Backup fuse for 10 seconds) then start the engine and i let it idle for about 3 minutes and the speed stay at 300

 

idle speed after finist the process

 

Okay thanks. That helps.

As an aside, to reset the ECU, it's generally best to remove the Back Up fuse for 3 or more minutes.

Have you cleaned the IACV? It does not seem to be working at all.

Any CEL codes after resetting the ECU?

 

Yes!, i have cleaned like 1000 times even yesterday i cleaned again.

about the reset, ok i'll note that