The Honda Accord is known for its durability and longevity, but even the most resistant cars undergo wear, many times leading to idling problems. The Accord most often experiences a consistent shuddering when idling, which can be solved quickly by adjusting the idle screw. A more erratic idle is often caused by vacuum hose leaks or a faulty fast idle thermo valve. You can save yourself a trip to a garage by diagnosing your Accord's idling problem at home.
Things You'll Need
- Socket wrench
Turn the car on and let it run for five minutes, then lift the hood and locate the idle air control valve (this valve is located in the engine compartment, behind the intake manifold). Unplug the control valve's electrical connection and locate the idle screw on the throttle body. Adjust the idle screw (it is very sensitive; rotate the screw by 1/4 turns) until the car reaches 800 rpm.
Turn the car off and reconnect the control valve's electrical connection. Use a socket wrench to disconnect the battery´s negative terminal and wait five minutes. Reconnect the negative battery terminal and turn the car on -- the vehicle will idle smoothly around 650 rpm.
Check all of the vacuum hoses and seals in the engine compartment, particularly on the throttle body and intake manifold. Any leaks in the hoses or seals can cause an erratic idle, as the engine will try to compensate for the loss of air caused by the leaks. Any leaking hoses or seals must be replaced immediately.
Check the fast idle thermo valve -- remove the intake tube from the throttle body and locate the two holes on the inside of the throttle body. The bottom hole leads to the fast idle thermo valve. Once you have located this hole, start your car, let it run for five minutes and then feel for any air coming from the fast idle thermo valve opening in the throttle body. If you feel any air or suction, the fast idle thermo valve is the cause of your vehicle´s erratic idle.
- "Haynes Manuals: Honda Accord 1998-2002"; John H. Haynes; 2005
- "Haynes Manuals: Honda Accord 2003-2007"; John H. Haynes; 2009
- Photo Credit Jupiterimages/BananaStock/Getty Images
Honda Idle Problems
The Honda Civic, a line of compact cars manufactured by Honda, is the second-longest car in production from the Japanese manufacturer. Despite...
How to Test a Fast Idle Thermo Valve
The fast idle thermo valve (FITV), commonly used on many Honda cars, is a sensor that controls the fast idle or warmup...
How to Clean an Idle Air Control Valve
Carbon can build up on an idle air-control valve, making it stick. When it sticks, it cannot control the idle of the...
How to Adjust a Fast Idle on a Honda Accord
The idle speed of a Honda Accord (or any other car) is determined largely by the tension on the throttle cable. The...
How to Clean an Idle Air Control Valve in a Honda Accord
The idle air control (IAC) valve in a Honda Accord controls the idle speed through the throttle body. When the IAC is...
How to Adjust the Idle on a 1989 Honda Accord DX
Over time, the idle speed may change in your Accord. This could be the result of repair work, outside temperature or the...
How to Repair the Idle Air Control in the Honda CR-V
The idle air control valve on the Honda CR-V is located on the intake manifold. It is computer-controlled, and adjusts the amount...
Idle ATC Problems in a Honda
Honda has manufactured a wide variety of all-terrain cycles, also known as "three-wheelers." While Honda's ATCs have been made in four-stroke motors,...
What Are the Causes of Rough Idling in a Honda Civic?
Honda's practical Civic has been known as a fairly reliable scoot-about since 1973 and for good reason. Honda knows that its customers...
Symptoms of a Bad EGR Valve in a '92 Honda Accord
The EGR valve in a 1992 Honda Accord is designed to direct some of the exhaust gases into the vehicle’s intake manifold....
Purpose & Problems of a Honda Idle Air Control Valve
The computer on your Honda fuel-injected engine uses the Idle Air Control (IAC) valve to control idle speed. When you fire up...