location of idle adusting screw and idel specificaition - 98 honda civic 1.5 L

You're right. So Kala, check what SoCalMike said first.

When you all get enough money together, for the best genuine Honda O2 sensor
prices I have seen, see https://www.automedicsupply.com/catalog4.php?#

By the way, by my parts sources, I think your engine is 1.6L. (I know:
That's got to be the least of your worries.)

 

I don't see your picture.

www.hondaautomotiveparts.com (after putting in your car's info) has a
drawing of the exhaust manifold with the oxygen sensor, if there's still
doubt.

 

We was going to get a realiable tech meter but the point is already moot. Of
course I would not tinker with the idle if I did not have a good meter, and
if i did not have to. I am trying to convince my brother to change the O2
sensor to the OEM type. well at least now people now its the one on the
manifold that we changed. so i'll leave it up to him.

 

I had been wondering what "tech meter" was. You mean "tachometer."

 

Why do you keep calling it a "tech meter"?

No it's not. You haven't done anything to make it moot yet. The problem
remains.

 

While I agree changing the idle screw won't help, what I've found is that
crud builds up under the idle screw between the throttle body and the
manifold. Cleaning that out made a huge difference to my idle.

Nobody seems to have mentioned it but, the most common causes of rough
idle are

1) Dirty throttle body

2) Dirty IAC

3) Carbon buildup.

4) Dirty injectors.

5) Vacuum leaks.

I'd clean the throttle body and IAC with INDUCTION CLEANER (not carb
cleaner which will destroy the IAC). Then I'd run a decent injector
cleaner through it like BG44K. BG44K cleans the injectors and removes
built up carbon.

I assume you've already looked for and fixed any vacuum leaks.