High idle

I got a squrreil in my air filter and it chewed a hole in it I cleaned my air control value and I pull some of the air filter out of the air control value and the idle is really high

My car has 160000 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
Hello. A high idle can be caused a few different things. If a squirrel chewed up your air filter it may be possible that it chewed on an intake hose, or another part of the intake tubing, which is now causing a vacuum leak. A vacuum leak can allow unmetered air into the engine, which can cause a high or unstable idle, and even performance loss. The same can also be caused by a faulty idle air control valve, or an issue with the vehicle’s fuel system, such as a leaky fuel injector. If the check engine light is on, retrieving the trouble codes will likely shed some light on what the issue could be. If you are unsure, I would recommend having a professional technician, such as one from YourMechanic, visit your location to diagnose what may be causing the issue.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Malfunctioning Throttle: A malfunctioning throttle system can cause both a high or low idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit. Computer Malfunction: If the powertrain control module is malfunctioning, idle speed may be affected.
Best Answer. Normal idle should be around 750 rpm. 1 person thinks this is helpful.
Often this is a result of dirt buildup in the air intake. Other times it can be a problem with a cracked intake tube. If the IAC motor`s vacuum port is leaking, this can be another cause of high engine idling. The leak could be sourced at the seal, or more often, in one of the attached hoses.
Typically, the idle speed will be set at a value in the range of 600 to 800 RPM, but the exact value will depend on the number of engine cylinders and whether the vehicle is equipped with a manual or automatic transmission.
Disconnect the idle air adjustment valve by locating and disengaging the electronic connector that holds it to the throttle body. Turn the idle screw to adjust the idle—turn the screw to the left to increase the RPM or to the right to lower it.
Typically, the idle speed will be set at a value in the range of 600 to 800 RPM, but the exact value will depend on the number of engine cylinders and whether the vehicle is equipped with a manual or automatic transmission.
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.
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.
Other possible causes of a high idle include vacuum leaks, EGR system malfunctions, malfunctioning oxygen sensors, dirty fuel injectors, fuel pump malfunction, faulty spark plugs, a faulty mass airflow sensor, a malfunctioning throttle and, rarely, a PCM/ECM malfunction.
One reason for a rough idle is it could be time to clean out the fuel injectors or it could be time to change out the spark plugs. Other reasons for the rough idling include: Exhaust problems. Holes in the air intake valve.
High idle reduces soot in the exhaust which results from incomplete combustion at low engine revs. This is important because when diesel engines are operating at low RPMs, more soot is generated. That can fill up the diesel particulate filter (DPF) which has been installed on diesel engines since 2008.
Rough engine idle and misfires

Since the oxygen sensor output helps control engine timing, combustion intervals, and the air to fuel ratio, a bad sensor can disrupt these engine functions, causing a rough or irregular engine idle and other engine-related issues.

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.
One reason for a rough idle is it could be time to clean out the fuel injectors or it could be time to change out the spark plugs. Other reasons for the rough idling include: Exhaust problems. Holes in the air intake valve.
Yes Subaru programs the engine to rev high when starting from cold in order to warm it up faster, it will lower after driving then stoping again or once it reaches higher temps, this is because engines are beat run at optional heat, Therefore heating up faster is more desirable for longevity, performance, ext.
Typically, the idle speed will be set at a value in the range of 600 to 800 RPM, but the exact value will depend on the number of engine cylinders and whether the vehicle is equipped with a manual or automatic transmission.

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.

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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.

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Why does my van always stay at a high idle 2000 Chevrolet Express
ANSWER : Hello. There are a lot of reasons that would cause a high idle, but most of the time it is caused by a vacuum leak. When there is an excessive amount of air entering the engine the computer will compensate with more fuel causing a higher idle. Most of the time the issue is in the intake manifold gasket. I would typically start by checking the engine sensor readings with a scan tool and then check for vacuum leaks with either propane enrichment or by performing a smoke test. If you need to have this idle issue repaired, consider YourMechanic, as a certified mechanic can come to you to [diagnose this high idle problem] https://www.yourmechanic.com/services/engine-idle-speed-is-high-inspection

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Truck idling high and shifting at high RPM when let off throttle
ANSWER : Hi There,
What you are describing sounds like possibly a bad speed sensor or potentially a faulty transmission control module, which also controls the speed sensors. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. A faulty transmission control module may cause also cause a delay in acceleration or erratic shifting of gears. Lastly, this may also be a result of low transmission fluid. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.

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Wont idle unless idle is turned very high. New filter,rebuilt carb,new lines.
ANSWER : I would definitely agree that your idle issue (especially on an older engine) is most likely a vacuum pump problem. However, it could be as simple as a stuck float bowl in the carb or idle adjustment screw that is faulty. I would recommend first replace the vacuum pump and check all vacuum lines. You might want to also verify the idle adjustment is accurate

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After replacing the power steering pump there was a low idle, idle screw is all out, running rich, and idle speed doesn’t change.
ANSWER : Hi there. The engine has a vacuum leak and is causing the engine to stumble down on the idle. Check all of the vacuum hoses and the brake booster for any leaks. The engine is rich for it’s not burning all of the fuel properly and may also have bad spark plugs. If you need further assistance with engine not adjusting the idle, then seek out a professional, such as one from Your Mechanic, to help you.

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Throttle body changed 3 days ago. Idle relearn performed and still high idle and revving while in park.
ANSWER : Hi there. Check the engine for a vacuum leak. Check all vacuum lines, hoses, and the intake for any leaks. Also check the brake booster for any leaks. A vacuum leak will increase the engine’s idle speed while the engine is not loaded. If you need further assistance with your engine revving in neutral and park, then seek out a professional, such as one from Your Mechanic, to help you.

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High idling, engine misfiring, car jumps at high RPMs
ANSWER : Hey there thanks for writing in about your 2002 Hyundai Elantra GT. The high idle is likely a bad idle air control motor (or air leak in the intake system). The misfire also may be caused by the factory spark plug gap being too great (.045"). Gap your plugs to .032" instead. To have this checked, have a qualified mechanic inspect the high idling and misfiring problems in order to have this correctly repaired and addressed.

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