High idling, jumping while idling, idle air control valve code
I have a car with the check engine light, that came on very recently. There was a code that indicates an issue with idle air control valve. The car has 130,000 miles on it. It has problems with idling. It idles at about 2200 RPMs when it is in neutral or whn parked. The idling is 1200 RPM while driving. The car would jump and jerk during idling while the vehicel is warmed up. It runs as though I am reving it again and again. On one terminal, I found a burnt female plug connecting to the IAC valve. I had the IAC valve replaced but the problem persisits. I noticed the spot where the plug melted
Experienced mechanics share their insights in answering this question :
Hi there. This can be caused by the issues that you mentioned or a number of other things. You need to make sure all of the connectors are making good contact. I would then need to know what codes are in the computer to know if this is a circuit issue or not. Most of the time, it is not the circuit but instead a vacuum leak.
If there is a vacuum leak, then the vehicle will act like this and the computer cannot control the idle. Most of the time it is a bad hose or an EGR valve that is stuck open. That is the most common cause for this. I typically remove the EGR to check it to feel the diaphragm on the bottom of it to see if it is moving correctly. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your car’s idling issue.
How to Identify and Fix Common car Problems ?
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The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. 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.
The engine`s oxygen sensor will detect the extra oxygen entering the engine via the vacuum leak which will alert the engine`s computer that the exhaust is running lean, which will prompt the computer to pump in additional fuel, resulting in an abnormally high idle.
If the idle air control valve becomes dirty or malfunctions, it may allow too much air into the engine, resulting in a higher idle speed.
An idle air control valve, also called an idle air sensor control motor, is an electrically operated valve that controls the amount of air that bypasses the throttle plate in cars with a fuel injection system [source: Autozone]. This causes the idling speed of the engine to change as needed.
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
Set the multimeter to measure Ohms, place the red lead on one terminal of the idle air control valve solenoid, and place the black lead on the other terminal. If the IAC valve is in good condition, you get a resistance between 7 and 25 Ohms, depending on its model. Another value means the unit is bad.
The most common problem is a faulty fuse. In modern vehicles, engine idle speed is most often controlled by the idle air control (IAC) motor. This can be impacted by bad fuses in many different electronic systems in your car. Next, your high idling could be caused by a computer malfunction.
If the PCM offers no hints, the best place to begin looking for problems is with the Idle Air Control Valve/Bypass Air Control (IACV/BAC). You can try cleaning it and see if that improves your idle speed. A throttle body cleaning is likely to cure the high idle speed as well.
High RPM – Idle speed is measured in revolutions per minute (RPM). For most 2 liter and below sized engines the vehicles, the standard idle speed should be around 750 RPM (when the engine is warm). If your car`s RPM is above 900 with a warm engine while idling, it is likely using too much fuel.
Once the O2 sensor goes bad, your vehicle`s main computer may push too much fuel into the combustion chamber. This will make your engine surge and you feel as if you are driving a bucking bronco.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
If everything is working as it`s supposed to, the engine idle speed should always remain the primary constant. However, over a period of time some mechanical components that monitor or control the flow of fuel into the fuel injector will become damaged and may contribute to increasing or decreasing engine idle speed.
In addition to the engine stalling, you may also notice that your idle is high or sporadic. The way you can tell this is by looking at your tachometer needle. If the needle is dancing up and down, the revolutions-per-minute are going too high and then sinking too low because of the engine vacuum leak.
Function. The functional objective for the crankshaft position sensor is to determine the position and/or rotational speed (RPM) of the crank. Engine Control Units use the information transmitted by the sensor to control parameters such as ignition timing and fuel injection timing.
The measurement provided by the TPS is used by the computer to adjust many parameters of the engine, primarily the amount of fuel delivered. A malfunctioning TPS will cause your engine to run poorly. Generally the engine will idle fine but will have difficulty accelerating.
Along with faulty spark plugs, a build-up of dirt and grime is the likely cause of cars stuttering when idle. A clogged filter or fuel injection system can starve your engine of fuel or oxygen, causing your car to judder and shake.
One of the main reasons why your vehicle could be vibrating at idle could be due to worn out spark plugs. When a vehicle`s spark plug is faulty, it can interfere with the air-fuel ratio leading to improperly firing cylinders, resulting in a misfire while idling. Replacing your spark plugs will solve this problem.
A PCV valve that`s stuck open will allow too much air to enter the intake manifold, leading to a leaner idling fuel-air mixture. Stuck closed leads to a build up of pressure in the crank case which creates a variety of oil leaks! And this in turn can lead to a range of issues, including a rough idle.
With solenoid energized, open throttle slightly and plunger will extend. Release throttle and adjust to desired RPM by turning hex head on plunger counter-clockwise to increase RPM and clockwise to decrease. When solenoid is de- energized plunger will retract.
Removing the idle air control valve can therefore have a negative impact on engine performance. In some cases, it may even cause permanent damage to the engine. As such, it is generally not recommended to remove the idle air control valve unless absolutely necessary.
When the idle air control valve fails, it inhibits the flow of air through the engine. When the car can`t receive air, it leads to engine stalling. The severity of this symptom can range from occasional stalling at first, to stalling immediately after ignition.
What is the Idle Stop Solenoid all about? Most older vehicles are equipped with a device called an idle stop solenoid that works to close off the throttle when the key is turned off. It prevents engine idle from continuing once the fuel and air stop being delivered to the engine.
What happens if idle air control valve is stuck open? If your car`s idle air control valve is stuck open, it will cause the engine to idle at a higher than normal rpm. This can lead to decreased fuel economy and increased wear and tear on the engine. In some cases, it can also cause the engine to stall.
incorrect idle speed: an iac valve that sticks in the closed position will create an idle speed that`s too low. your rpms will drop way down the car may feel like it`s about to stall. on the other hand, an iac valve that sticks in the open position will create an idle speed that`s too high.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
High idling, jumping while idling, idle air control valve code
ANSWER : Hi there. This can be caused by the issues that you mentioned or a number of other things. You need to make sure all of the connectors are making good contact. I would then need to know what codes are in the computer to know if this is a circuit issue or not. Most of the time, it is not the circuit but instead a vacuum leak.
If there is a vacuum leak, then the vehicle will act like this and the computer cannot control the idle. Most of the time it is a bad hose or an EGR valve that is stuck open. That is the most common cause for this. I typically remove the EGR to check it to feel the diaphragm on the bottom of it to see if it is moving correctly. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your car’s idling issue.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
Trying to locate the Mass Air Flow sensor , and the Idle Air Control valve 2002 Ford Fiesta
ANSWER : Hello – Mass Air Flow meter is a short, cylindrical section of the air intake, just inside of the air filter housing, and just before a large cuved plastic-molded piece of the air intake. It has a flat electrical connector plugged into it. The idle air control valve is just past the throttle body in the intake, on the engine side of the throttle body. It is a small cylindrical tube about 1 1/2: in diameter and 4 inches long, bolted to the intake manifold with an electrical connector. For the effects of dirty sensors – click here.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
High idle after replacing fuel pump tps and air idle control valve
ANSWER : The first thing to do is to verify there are no vacuum leaks in the engine and verify the installation of the parts. Once this is done then disconnect the battery and then let sit for two minutes and reconnect battery and relearn the idles by starting the vehicle and putting in drive after it warms up for two minutes with a/c off and then two minutes with a/c on and then road test normally to verify ides good.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
High Idle, stalls when a/c or defrost is turned on and dies completely after some rough idling. If turned back off car is fine.
ANSWER : Hi there. The fact you able to get the idle speed to drop by tapping the gas pedal, lead me to believe the high idle is due to a sticking accelerator cable. Another possibility could be, a faulty throttle body not allowing the throttle to return to the closed position. Proper diagnoses should be performed to avoid unnecessary repairs. I recommend having your vehicles high idle be diagnosed and repaired by a certified technician, such as one from YourMechanic.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
P1510 trouble code is showing up. Cleaned the idle control valve but it won’t start.
ANSWER : The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. If this valve does not have the correct voltage to it, it will also not work properly.
When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. This is all done by the idle air control valve. When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this may indicate a dirty or faulty idle air control valve. In cases where this valve is dirty or failing, your vehicle may stall instead of slowing to an idle after the release of the throttle.
To avoid any unnecessary repairs, I would recommend having a certified expert, like one from YourMechanic, come to your location to diagnose your no start issue and service your idle air control valve as necessary.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
I had a p0405 get code replaced egr valve, map sensor,mad sensor, and PCv valve just to be safe but still getting the code why?
ANSWER : The code P0405 and a rough idle is most likely due to carbon getting into the EGR pintle. This will hold the EGR open. When you are getting the rough idle you should shut off engine and remove EGR valve. Check to see if carbon is holding the pintle open. If it is then you will have to remove the carbon from the pintle. Then try and clean out the EGR passages by scrapping them using a round wire brush. Afterwards, start the engine for a few seconds with valve removed to blow out loose carbon. You should then spray a small amount of carbon cleaner into the passages to dissolve the carbon. Lastly, reinstall the EGR and reset the light and codes.
If you’d like assistance with this, consider YourMechanic, as a certified professional can come to the vehicles locations to perform these checks and properly diagnose your Check Engine Light.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
Idle too high. 1994 Chrysler New Yorker
ANSWER : Hey there, thanks for writing in about your 1994 Chrysler New Yorker. Start your engine and let it idle in park for at least 5 minutes. Listen and check the engine for any vacuum leaks or inlet air tube leaks. Any vacuum leaks will result in a higher than normal idle. You may need to use a rubber hose to your ear to isolate any vacuum leak. You will hear a sucking sound when you find it. For help having this resolved, a professional from YourMechanic can come to your car’s location to inspect the high idle and let you know what repairs are needed.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
After fixing my radiator, radiator hose, thermostat, and idle control valve my car continues to idle very high and run hot. Help??
ANSWER : Hello, high idle can be represented by many conditions. A heater core would not cause this unless you have a coolant leak and the core was leaking. There are tests that can be performed to test a water pump (coolant pump). A vacuum leak can create high idle and even a high engine temperature. A suggestion is to read engine data and any fault codes in the system. This is done with a scan tool. The scan tool can read data which will give you information on the operating systems of the vehicle. If you’d like, a certified technician from YourMechanic can come to your location and do a complete evaluation of the overheating issues.
Read Full Q/A … : High idling, jumping while idling, idle air control valve code
