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engine idle

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How to Troubleshoot a Car Idling at a High Speed
Car idle speed increases or decreases if there are damaged fuses, idle control valve, throttle blades, ECM, or a vacuum leak.
Symptoms of a Bad or Failing Idle Control Valve
Common signs include irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling.
Symptoms of a Bad or Failing Oxygen Sensor
Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle.
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve
Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Throttle Body Temp Sensor
Common signs include poor engine performance, stalling, and broken electrical connections.
Symptoms of a Bad or Failing Air Cleaner Temperature Sensor
If your car is having trouble starting in the cold, the Check Engine Light comes on, or idle quality is poor, you may need to replace the ACT sensor.
Symptoms of a Bad or Failing Distributor O Ring
If your car has a distributor, common signs the o-ring must be replaced include oil leaks and engine performance issues.
Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Tube
Common signs include rough idle, rattling noises from the engine, and the Check Engine Light coming on.
Symptoms of a Bad or Failing Idler Pulley
Common signs include a damaged bearing or pulley, squealing from the engine area, and visibly worn pulleys.
Symptoms of a Bad or Failing Air Fuel Ratio Sensor
If you notice a decrease in fuel efficiency or engine power output, as well as a rough idle, you may have to replace any air-fuel ratio sensors.
How Long Does a Timing Chain Last?
A timing chain is a metal chain, as opposed to the timing belt which is...
How Long Does a Top Dead Center (TDC) Sensor Last?
The top dead center (TDC) sensor is the point from which the firing order is determined and the ignition system measurements are taken. The measurements are normally defined as before...
How to Buy a Good Quality Idler Pulley
The idler pulley system drives a car’s alternator and is part of a belt and pulley system that also covers power steering, the air compressor, and other devices. The pulley is essential;...
How Long Does an Idler Pulley Last?
The drive belt that is on a car runs nearly all of the major components of the engine. Most of the newer cars on the market have a serpentine belt rather than...
How Long Does an Idle Control Valve Last?
Among the most important factors in having a smooth running car is a consistent idle speed. Having the incorrect idle speed can lead to a variety of different issues. There are...
How to Keep Your Car From Stalling
When driving a car, we expect it to get us from point A to point B without any issues. It can become unnerving to drive if your car stalls randomly when...
How to Check an Idle Air Control Valve
Idle air control (IAC) valves regulate the engine idle speed. Engine idle speed is the revolution speed of the engine when the throttle is inactive.

Related questions

Question
When I start my car up it feels like it's going to cut off it's shakes the idle feels like it's going to cut off it's just shakes
Hello, thank you for writing in. There is a component on the vehicle known as the "idle air control valve", which is responsible for managing the idle speed when you are not on the throttle. It is also utilized when...
Question
Car feels like it want to launch more pressure on brake than usual rpm jumping up and down when in neutral or park
Hello, thank you for writing in. Unfortunately, there are a large number of components that can cause this. The vehicle needs to be scanned for diagnostic codes. Even without an engine light on, there may be code present pertaining to...
Question
Why does my 2003 Chevrolet Tahoe idle rough when in gear
Hello. It sounds like you may have a few things going on here. Most of the time if you are having issues with the vehicle when the fuel is low it is because the fuel pressure is dropping off at...
Question
High idle on oldsmobile silhouette 2001
This is a common problem, so common that you can simply go to YourMechanic's engine idle speed diagnostic and repair service page to request a resolution through an on-site diagnostic. In the majority of vehicles, engine idle speed is controlled...
Question
I have a 1995 Isuzu rodeo .
The engine hesitation could be related to the causes of the high idle or could have a separate cause such as faulty oxygen sensors or a faulty throttle position sensor. I suggest you resolve the high idle first because it...
Question
RPM goes high while sitting still miss firing 02 Deville I think 4.8
Hi...engine idle speed is controlled by an idle air control valve (IAC). A faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading to a higher than normal engine idle speed. The IAC...
Question
Truck has a slight shake at idle in park or in drive at a stoplight
Hello, thank you for writing in. The vehicle is likely having an issue with one of its three main components: air, fuel, and spark. Most vibrations and shaking come from a misfire of some kind. You will want to check...
Question
I have a 2002 Acura tl 3.2, what can cause the car to do this? Hesitates and then surges con't without my foot on gas pedal.
First check to see if any OBD-II codes have set. A real time scanner can be used to check the operation of the throttle position sensor - TPS. TPS faults are a common cause of the symptoms you are describing....
Question
I. Just. Bought. A2007bmw3series the. Car. Takes a. Pull. 5min into driving
If you are referring to the first few minutes of driving when the engine is cold, the engine coolant temperature sensor must be working properly to signal the PCM to enrich the mixture on cold start. If there is a...
Question
Car idles rough with AC on - 2008 dodge avenger
Hello, thank you for writing in. There can be multiple problems with the vehicle causing your issues. First, we need to take a look at the drive belt which sends power to the AC system from the engine. When the...
Question
I have a 2012 equinox and it is rattling upon acceleration and kind of rough idleing when stopped
In practice, oil consumption varies quite a bit, so much so that there is no agreement on what is excessive. As a "general" rule though, if an engine uses a quart of oil or more in 1,500 miles, that's excessive....
Question
Why is my RPI really high when I stop at a traffic light
In the majority of vehicles, engine idle speed is controlled by an idle control valve (ICV). The ICV valve can fail or a faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading...
Question
2001 LINCOLN AC WORKS BUT COMPRESSOR SLOW TO ENGAGE
The compressor will not engage until the computer turns on the relay for the clutch. Try to hold the gas pedal up just above idle to about 1000 rpms and see if compressor kicks on quicker? If it does then...
Question
When I am in park the shakes like a sputter but once in drive there is no issue this problem just happened after I put a car audio
You may have lost your learned fuel control when the battery was disconnected. You may need to have the throttle body and injectors cleaned and then the idles relearned.
Question
RPM fluctuation every few seconds with AC on at Idle in my 2013 Ford
Hi there. It is common to see a small fluctuation in RPM when the AC turns off and on due to the drag on the engine. It should not drop that much though. It sounds like the idle control system...
Question
Car stumbles at idle but fine when drive or push gas peddle
Hello, thank you for writing in. There are a huge number of components that can contribute to a rough idle. Always start by scanning the vehicle for diagnostic codes regardless of a warning light being on. If no codes come...
Question
2006 Acura TL Has High Idle
Your vehicle uses electronic throttle control to maintain the desired idle speed. In this system, the engine control module (ECM) receives input from various sensors to determine how much the throttle should be open. It then opens and closes the...
Question
I have Pontiac G6, it shakes when idle. Usually when I drive and stops on signal. I read some code and it shows P0300 and P0301.
The codes P0300 and P0301 are coming up for a misfire on cylinder number 1. Check the cylinder for spark, fuel, and air. Check the spark plug and make sure that it is firing. The spark plug wire could have...
Question
Car turns off. First it would turn off in reverse and when I would stop at a red light or slow down to make a turn.
Hi there. For the reverse stalling condition, check the Idle Air Control Valve and see if its plugged up. If a IAC valve is plugged up, an engine will stall out when going into gear and could cause issues when...
Question
Car is idling at high rpm's and when the days are hot the car cranks but doesn't turn on and also exhaust is smoking when i rev it
Hello - your symptoms suggest worn piston rings or valve stem seals (smoking), and a possible air leak in the intake, or idle air control valve sticking open (high idle). Both are signs of a higher-mileage engine with significant wear....

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