Rep Power: 0

My 2002 honda civic RPM Wont stay at one level. It always Reving up and down when it's in idle mood..anyone have any idea what causing that to happen?

 
Rep Power: 119

Air leaks can do that as well as idle air controller being clogged / failing.

Before tossing time and parts at it though, be sure to follow the sequence for idle relearn.

 
Rep Power: 0

What you mean by sequence for idle relearn?

 
Rep Power: 224

Stolen from another thread on here:

1. drive car til its warmed up.
2. turn car off, disconnect battery or pull FI ECU fuse out.
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 10 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.

Can be found in this thread: https://www.civicforums.com/forums/3...e-posting.html

 
Rep Power: 367

Idle issues, not electrical problems...

Moved to correct section ('Yes, we created a special section for that, for it is reeeealy common.

Read around this section. Plenty of information across the decades this car have been around...

If you have problems with english, let us know. Since you can't find the correct section or search for the issues before posting.

 
Rep Power: 0

My 2002 civic ex is idling up and down .when its wormed up ,it just keeps going up and down. I cleaned the idle control valve and test the TPS and its reading pretty fine, I think.any advise on this issue.

 
Rep Power: 133

Check for vacuum leak.
EGR valve/ports clogged with carbon?
Got a P0505 code?
Clean the throttle body.
Check for faulty IAC valve.

 
Rep Power: 0

So I did the relearn process just about an hour ago and it seems to be working..thanks to all the advice that you guys gave me.i Also changed the crankshaft sensor and I'm starting up pretty fine for now lol..