crazy idleing

My 92 prelude si is, when ever i start it, starts to rev it self up to around 2300ish rpms then drop it to 1000 and do it again and it repeats this for a long time i used to notice it would stop but now im not so sure. Any sugestions?

Thanks

Whats the temperature outside when this happens? My 97, as pretty much everyone Honda I've been in, does that when it's cold until it's warmed up. Maybe that helped?

im getting a car an wanted to know what the best car to start off with.......an no civics thanx peace

yeah its prob. cuz u havent warmed up ur car yet, wat i do is let my car idle for 3 mins atleast every morning before driving after about 3 mins the rpm drops to around 1000

vacuum leak,

i'm pretty sure it's just a problem when your honda is cold in general. i drove mine for 100 or so miles, and my destination was sub-freezing temps. i got there, and my car was running so cold that this happened.

my friend's civic did this as well.

My 95 vtir prelude does the same. I took my car to Honda and they call it Humping. They seemed to blame the problem on carbon build up in some valve? And it is quiet common when the car is cold, or when there is a big build up of carbon. This is only what i was told. Makes no sense to me. Fkn annoying though!

Yea annoying is right especialy with an exaust system

a vacumn leak.... try spraying a small amount of wd40 around on the engine..if your idle pics up then thats where your leak is...


gunnmen01