hey there
i just bought a 96 accord 25th anniversary edition. the car has a rebuilt motor in june of 2008 so i know it cant be the motor. but reccently i have been having a problem that after i drive it the engine starts to rev up and down.when i start the car up it idles at 1200-1400 rpms and when i put it in park or neutral it goes up to like 1900 and starts going up and down between 900-2100. i was told it could be my iacv. i also have a radiator problem where my overflow tank is completely empty even after i fill it up. does anybody have any ideas on what it could be??

and no i dont have a radiator leak because i have a brick driveway and i would have seen it on the floor with all this cold weather and dry brick.

 

first off... you've posted this in the civic forum.. try reposting in the accord forum
https://honda-tech.com/forums/honda-accord-1990-2002-2/

i would be very skeptical of a rebuilt honda engine. usually it's cheaper and more reliable to get a low-mileage used motor, than to rebuild.

i think your issue is related to a vacuum leak in the intake system. the iacv is basically a controlled vacuum leak so if it sticks it could cause similar problems, but there is more oppertunity for a vacuum leak to show up around one of the gaskets, or vacuum hoses.

 

yeah i realized that after i posted ..sry lol
but yeah thats what i was thinking..i know my iacv is not shot cause when i first turn on the car it idles but not at low rpms ..probally needs to be cleaned??