When I start my car it idles reving by itself from 1,000 Rpm to 1300 up and down. Also it is running very rich and has a very strong gas smell. Any ideas of what this could be?

I have a 2000 civic Ex, with headers,cai,exhaust and upgraded ecu..

 

Upgraded ecu eh? and headers? what the hell you runnin in there?

 

Is the CEL ON?

The idling problem might be due to a dirty IACV (=clean with carburetor cleaner), bubbles in the cooling system (=bleed system), or an intake air or vacuum leak (=spray carburetor cleaner around hoses/gasket to see whether engine bogs).

As for the running rich, the primary O2 sensor or its circuit could be faulty.

 

Um I dont really know i just traded my mustang for this car so I dont know anything about civics....
To see pics you can go to http://www.cardomain.com/ride/3022721 and to https://www.hondacivicforum.com/m_56.../tm.htm#560687


Let me know..
And thanks!

 

Try running a stock ECU

 

+1

 

Ya but I really don't know anything about Hondas so I don't know where I'd begin to taking it out.

 

Still a good trade?

 

Haha funny comment, but yes. This is nothing compared to problems the mustang had.

 

Ebay or Craigstlist for a new ECU.

I just saw a 6th gen ECU on Ebay today, actually.

The installation is generally straight forward, and a tutorial can be found with a simple google search.