car idle

i was driving my car yesterday, and was all fine, and i stopped at lights, and noticed my car was idleing normal, then it goes up maybe 200, for 2 seconds, then back down to normal 2 seconds, then back up 200 for 2 seconds, and thats how it idles. Just up and down every 2 seconds.

Any suggestions??

fan turning on and off? could be..

Were you running the aircon?

Don't know about the fan, but nop, car hasnt been driven for about 3 weeks, and i took the air con out while it wasnt being driven.

Was only on a short trip, was fine first 10 minutes then started this idle thing

sounds like you need to ground your car more for a more stable idle. do one of those diy engine grounding guides

Dirty Throttle Body, http://www.ozhonda.com/forum/showthread.php?t=35488
FITV needs adjusting (when engine is cold)
IACV needs cleaning (when engine warm)

Im pretty sure its not throttle body,

I was thinking more into IACV, and i dont think the 96+ have a FITV, or timing or something like that.

if its hunting like that it can be many options

Ground/Earth needs a better connection

Sensor or sensor's
Maybe o2 sensor

TPS

AFM might need to be cleaned

Vacuum leaks

just a few things to check

I dont see how it could be the ground, they were never touched and there was no problem with it before.

Ill check the others, my exhaust manifold and entire intake arm were removed, and then reassembled. Ill check its all been put together right.

i recently experienced the same problem when i came back from a holiday and got my muffler fixed. see if theres a constriction in the pipe, or rev the throttle up to flush some crap out. What eurodude said might be true, dirty throttle.

I removed my throttle body and fully cleaned it. It was full of shit, as well as my IACV. They are now spotless but still, i have this issue.

I tried to start my car while the dizzy connector was unplugged. Would this have any effect on my car?

It was a while ago, when i was doing some stuff with my car it hadnt been driven for about 1 month, and i tried to start it and realised i didnt plug the dizzy in. I didnt drive it after that for about a week, and when i finally drove it, is when this problem started.

I'd replace the TB gasket. Cheap and effective way of fixing idle hunting. Take the TB off and buy a gasket from Honda for about 16bux. WD40 it for good adhesion before putting it on. Start her up and see how she idles then.

I've had this problem before and everything was tried and done, but it never occurred to me that the TB gasket had shit itself. I changed it straight away and WALLAH! FIXED! :D