How does a Honda idle air control valve work?

The computer on your Honda fuel-injected engine uses the Idle Air Control (IAC) valve to control idle speed. When you fire up the engine for the first time during the day, the engine is below operating temperature. The IAC valve lets air bypass the throttle plates to increase engine RPM and smooth engine operation.

An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. That allowed more air to pass, create more suction, and move more gas into the cold engine.

Likewise, how do I know if my idle air control valve is working? To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.

Keeping this in consideration, what happens when the idle air control valve goes bad?

One of the most common symptoms associated with a problematic idle air control valve is irregular idle speed. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls.

How do I reset my idle air control valve?

Reset the IAC valve pintle position by performing the following:

  1. Depress the accelerator pedal slightly.
  2. Start the engine and run for 5 seconds.
  3. Turn the ignition switch to the OFF position for 10 seconds.
  4. Restart the engine and check for proper idle operation.

Can a idle control valve be cleaned?

Cleaning an idle air-control valve can keep you from buying a new part, but only certain idle air-control valves can be cleaned. The idle air-control valve must have a spring-operated valve for cleaning to make it work.

Where is idle control valve located?

The idle air control valve (IAC) is located near the throttle body of the intake manifold in most cases. Additional designs include rubber hoses running from the throttle body and air intake tube to a remote valve.

Where is the throttle position sensor located?

The Throttle Position (TP) Sensor is located on the bulkhead, above the accelerator pedal. The Throttle Position (TP) Sensor is located on the bulkhead, above the accelerator pedal.

What is a idle control valve?

An idle air control actuator or idle air control valve (IAC actuator/valve) is a device commonly used in fuel-injected vehicles to control the engine’s idling rotational speed (RPM).

What does p0507 mean?

The P0507 code means the idle control system has excessively high RPM. The ECU has a specific rpm range the idle is allowed and when it is higher than expected the ECU sets the P0507 code. Once this code is triggered it puts the vehicle into a failsafe mode and the Check Engine Light is illuminated on the dashboard.

How long do IAC valves last?

The more carbon that these components start to acquire, the harder it will be for the air to pass through them properly. The idle air control valve on a vehicle is supposed to last as long as the car does, but this is usually not the case.

What are the symptoms of a bad throttle position sensor?

Here are some common symptoms of a bad or failing throttle position sensor to watch for: Car won’t accelerate, lacks power when accelerating, or accelerates itself. Engine won’t idle smoothly, idles too slowly, or stalls. Car accelerates, but won’t exceed a relatively low speed, or shift up.

Will a bad IAC cause loss of power?

The same happens with the power steering, which also uses electricity and increases the load in the IAC. Eventually, it will stop working and prevent the engine from working correctly. You may not experience a completely stalled engine, but a significant loss in RPM, which is another clear sign the IAC is faulty.

What causes rpms to fluctuate at idle?

When the engine is warmed up, I notice that the RPM needle varies from 700 to 900rpm. Erratic engine idle can be caused by various factors, but the most common and likely cause is a dirty or malfunctioning Mass Air Flow (MAF) sensor.

Can idle control valve cause misfire?

The engine may be stalling because it isn’t getting enough throttle opening. The cause is often a problem in the idle air control system. The first thing to check is the intake vacuum with a vacuum gauge. An EGR valve that is leaking can also act like a vacuum leak and cause a random misfire.

What causes rough idle?

Rough idling can also be caused by clogged filters. Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. These items are all important parts of what keeps a vehicle running. Spark plugs provide the spark that ignites the air and fuel mixture within the cylinders.

Will bad IAC cause hard start?

As to your problem, a cam sensor can cause a crank no start. A faulty IAC can also cause a crank no start. You also have a code for the oil psi sensor which can also cause a no start on some vehicles. This may require that you track down a service manual for the vehicle you’re working on.