Civic EG

I start up my car but my guage shoots up to 4K ..what could cause this. Can someone help me with this. I've tried turning the idle down but that didnt work..

Could be a few things. Do you have any MIL codes?

Stuck throttle plate, bad idle air control (IACV), bad fast idle control(FITV), big vacuum leak(ie: throttle body gasket or brake booster hose), bad/stuck TPS, Throttle stop screw moved(This is the one under the gold throttle wheel that has a small nut and allen key in it).

Also here is a link with all the info you could want on the IACV, FITV, and Honda PGMFI idle control.
http://ecomodder.com/forum/showthread.php/honda-iacv-explained-967.html

EconoBox wrote:Could be a few things. Do you have any MIL codes?

Stuck throttle plate, bad idle air control (IACV), bad fast idle control(FITV), big vacuum leak(ie: throttle body gasket or brake booster hose), bad/stuck TPS, Throttle stop screw moved(This is the one under the gold throttle wheel that has a small nut and allen key in it).

Also here is a link with all the info you could want on the IACV, FITV, and Honda PGMFI idle control.
http://ecomodder.com/forum/showthread.php/honda-iacv-explained-967.html

Ok thank you I will look over everything and see what I find

That high of RPM means you have a major vacuum leak. Should be easy to spot. Start by looking over your hoses.

After you find it, set your idle properly. Don't just grab a screwdriver and crank the adjustment screw. There's a procedure to it.