ok I have a 98 Civic DX with stock engine. Idle keeps going up and down up and down. I got a new Throttle body and a new Throttle body Gasket, I clean my IACV. I checked vacuum lines all of these are fine. I dont know what else to do. It is really anoying when you come to a stop and the idle keeps going up and down. HELP ME figure this out anyone

 

err maybe its the ECU?

 

ECU? what do I need to check on the ECU the car Runs perfectly find its just that damn idle when you come to a stop

 

Any check engine light?

 

it's probably air in the coolant, making the iacv, or the fiav read incorrectly.

unless there is a code, then that is my guess

 

how much is the idle moving up and down? does it move at regular intervals or does it seem random?

 

:werd: check your coolant levels. mine was doing the same thing when my lower hose sprung a leak and my car was running low on coolant.

up and down at idle...pretty quickly too.

 

ill check the hoses and coolant today thanx

 

is a new throttle body/gasket a lot of money, cuz i have that exact problem. Does urs idle really low sometimes, mines causes my engine to turn off some times. Kinda like its stalling. I hope it doesnt cost too much to fix it cuz i dont have the money to get stuff like that.

 

bxsnypa, the throttle body gasket shouldn't be too much, but a new throttle body is gonna cost ya. I couldn't figure out if that was what he said he replaced but there's MO.