Showing articles & questions for topic
engine idle

Related articles

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 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...
P0518 OBD-II Trouble Code: Idle Air Control Circuit Intermittent
Diagnostic Trouble Code (DTC): P0518 P0518 code definition If the PCM has registered an inconsistency in the engine idle RPM; the P0518 code will be stored. What the P0518 code...
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
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
engine revs up and down when in park and it dies when puts in drive
Hello, thank you for writing in. There a large number of components that can cause these issues. If you have not scanned the vehicle for diagnostic troubleshooting codes, you will want to do that first. Even without a check engine...
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
I recently had my batter replaced at a Valvoline Instant Oil center. After replacing the new battery, I drove off and turned on t
The engine idle will relearn on its own and will take a couple days of driving. The a/c door actuators will need recalibrated using a scan tool that can put system in recalibrate mode in order to fix the a/c....
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
I have a 2008 Honda Odyssey and 3 weeks ago my CEL came on and the van started vibrating while idling.
Hi there. Since the check engine light is coming on I would have to scan the computer for codes to see what is happening. It sounds like you may have an intermittent issue. Most of the time this is caused...
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
2001 mitsubishi montero limited. Need to calibrate idle air valve.
Hello. In order to properly adjust idle speed on this vehicle you will need a scan tool. The vehicle will need to be put in relearn mode to do so. Over time the computer will adapt on its own if...
Question
My 2001 automatic Miata idles really rough at stoplights when I run the AC, but not when it is off.
Hello, thank you for writing in. Two aspects about the issue lead me to believe the previous technician is correct. To start, the compressor is the only component that will effect the engine, as it is the part connected to...
Question
Engine shaking rough idle losing power and burning rich
Hello, thank you for writing in. The first step when having these issues is to scan the vehicle for diagnostic codes, regardless of having a warning light on or not. With no codes, it will be a process of elimination....

Need a mechanic?

Our certified mobile mechanics make house calls in over 700 U.S. cities. Fast, free online quotes for your car repair.

Get a quote

Post a question and get free advice from our certified mechanics.


Ask a question