Table of Contents
Part 1 of 1: Replacing an idle control valve. Materials Needed. Step 1: Disconnect the battery. Step 2: Locate the valve. Step 3: Disconnect the wiring harness. Step 4: Remove the old idle control valve. Step 5: Clean the seat. Step 6: Install the new valve. Step 7: Reinstall the wiring harness.
How do you reset your idle air control valve?
Turn the ignition ON and leave on for several seconds then turn the ignition OFF to allow the ECM to reset the IAC valve. You should be good to go.
What are the symptoms of a bad idle air control valve?
Common signs include irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling.
How do you replace an IAC valve?
How to Replace the Idle Air Control Valve Park the vehicle on level ground and allow it to cool for 20 minutes. Open the hood of the vehicle and locate the idle air control valve. Unplug the wiring harness from the IAC valve. Use a socket wrench to loosen and remove the two bolts securing the IAC valve in place.
What happens if you remove the idle air control valve?
If the idle air control valve is not working properly, then the engine won’t receive this air. As a result, the idle speed will be thrown out of whack and cause the engine to stall.
Can idle air control valve cause no start?
4. the car won’t start: in extreme cases, the iac valve may cause too much or too little air from entering the engine when you turn the ignition, resulting in engine that cranks but doesn’t start.
Where is the idle air control valve located?
Locating the Idle Air Control Valve The IACV is usually located on the intake manifold near the back of the throttle body. Before starting the cleaning process, be sure the vehicle is not running and that the engine is cool.
Can you drive with a bad IAC valve?
Technically, you may be able to drive with a bad IAC—but you should not continue doing so. A bad IAC can potentially lead to stalling, which can compromise vehicle safety. Plus, you won’t pass a state emissions test if the check engine light is on due to a bad IAC.
How do I fix code P0505?
What repairs can fix the P0505 code? Replacing the IAC valve and cleaning the throttle body and passages. Removing carbon from throttle body and IAC passages and clean IAC. Repairing a vacuum leak in the engine intake manifold vacuum system or gaskets.
Can a bad idle air control valve cause misfire?
IT CANT CAUSE A MISFIRE UNLESS YOU HAVE A LEAK AROUND THE INTAKE MANIFOLD TO IDLE VALVE SEAL.
Can the idle control valve be cleaned?
How do you clean an IAC valve? After relocating the IAC valve, you need to unscrew it and detach all the wires. You can clean it by soaking it in gasoline and blowing compressed air into it. Then, reattach it with the screws and reconnect the wires.
Can IAC cause smoke?
An obstructed or stuck-shut IAC will result in a rich air-fuel ratio at idle, so the engine will start very easily while cold and then die suddenly after a slight puff of black tail-pipe smoke. A stuck-open IAC might start fine while warm and may continue to run if the engine reaches high-enough RPM.
How long do idle air control valves last?
In general, you will need to replace the IAC valve every three or four years. This will keep carbon from accumulating in the valve and causing you problems. The most common sign that your IAC valve is malfunctioning is that your engine will stall.
What controls engine idle speed?
Idle speed is controlled by using an electronically controlled throttle bypass valve, as seen in Fig. 6.6, which allows air to flow around the throttle plate and produces the same effect as if the throttle had been slightly opened such that sufficient. flows to maintain engine operation.
Can IAC cause hesitation?
Your IAC Valve May Be To Blame. You press down on your gas pedal and expect your car to take off smoothly, but that may not always happen. You might be experiencing hesitation due to a bad IAC valve (or idle air control valve).
What happens if you unplug your throttle position sensor?
The TPS as we call it is one of the most important sensors on the engine. Without it, the computer has no way of knowing when you push down on the gas or open the throttle. Best it can do it watch some other sensors and make some estimated guesses. On some cars, it may burp just as you unplug it if it’s running.
Can you clean an IAC with brake cleaner?
IAC’s take an hour at the most to clean. The materials you will need to clean your IAC are: Brake cleaner, WD40, 10 mm and 5/16″ sockets/drivers or wrenches. You will want to spray brake cleaner in the 2 holes, of course following the instructions.
How do you test a idle control valve?
Go behind the engine and unscrew the idle air control valve from the throttle body. Pull the electrical plug off the control valve. If the top has a release tab, then squeeze that as you pull. Take out the idle control valve and flip it over.
Can I drive with a P0505 code?
Trouble code P0505 should be diagnosed and repaired as soon as possible. Not recommended, however, you may drive your vehicle while trouble code P0505 is present unless the engine stall or stumbling is is severe enough to hinder proper vehicle operation. Erratic or lack of idle control may be noticed.
How do I fix code P0507?
What repairs can fix the P0507 code? Replacing or cleaning the idle air valve. Repairing the intake air leak. Repairing the charging system. Cleaning the throttle body. Replacing the power steering pressure switch.
