To adjust the idle on a 2005 Honda Civic locate the idle control valve. The IACV and is found near the intake manifold. Open the top of the valve and tighten it to lower the idle or loosen it to raise it.
The idle speed on a 1996 Honda Civic is adjusted using an IACV. The IACV, or idle air control valve, lowers and raises the idle by either being tighten or loosen.
The idle speed on a 2001 Honda Civic is adjusted through the idle air control valve. The valve is located behind the intake manifold. Open the cover using a screwdriver and tighten the valve to lower the idle.
you cant without having a remap. its controlled electonically by the ecu via the Idle air control valve on the throttle body. generally only vehicles fitted with carburetor can adjust idle speed manually.
Idle Air Control Valve.
a 98 Honda civic should not have a carburetor. it is a fuel injected vehical. in this case there might be a screw that you can adjust the idle with. have someone watch the engine as you pump the gas. the engine can be off when you do this. they will show you the arm, of lever that moved. when it sits all the way down (gas pedal off all the way) it will stop on a screw. turning it right = idle up, turn left (counterclockwise) = idle down. but mostlikely everything is all electric and a shop will have to adjust it with a computer.
The Honda Civic loses idle at stop due to not have consistent air flow. The engine will run too lean and cause the car to shut off.
IF ITS JUST AT IDLE, CHECK YOUR IDLE AIR CONTROL VALVE IF IT HAS ONE.
turn the idle screw!
Your 1994 Honda Civic will overheat when the thermostat is malfunctioning. The overheated engine can experience the idle to surge. The engine should be turned off immediately.
I assume it has carb's. If so, follow the cable to the carb's. There is a little screw you can tighten to increase the idle or lower it. Just a long screwdriver and watch the tach.
Because of the loss of backpressure if can affect the idle.