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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 made of rubber. The chain is located inside of the engine and needs to be lubricated by...
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
Car keep shutting off.
Hi there. Check the Idle Air Control valve and see if it is plugged or not working. The IAC valve controls the engine idle and when the vehicle is at a stop the idle can drop and cause the engine...
Question
have a 98' Honda Civic Dx with manual transmission that's got some sort of issue. Most of the time it runs just fine, but randoml
Hello, thank you for writing in. Although the parts you have replaced are the key components, you are going to be more worried about the air intake, throttle, and idle air control valves. The idle air control valve keeps the...
Question
hi I have a holden commador, vt, 1999 model. when I accelerated just leaving my drive way my revs go up to 4. what could be causin
Hello, thank you for writing in. While there are several components that can cause this issue, you may be looking at a torque converter or transmission issue. You may want to start with a transmission service including the fluid change...
Question
Truck has a problem idling. 1996 dodge ram 1500.
There could be an issue with the clutch pressure plate springs. One or more of the springs may be damaged causing the pressure plate to apply at an angle making the clutch assembly lock up with the transmission input shaft...
Question
Cleaned throttle body, now it won't go into gear.
The Idle Air Control valve got damaged when the throttle body was cleaned. I suggest removing the IAC valve and cleaning it out. The electronics could be wet causing the valve to change the engine idle and the computer will...
Question
1999 Jeep Cherokee idles fine, loss of power at higher rpm. Cruise control stopped working at the same time. Stalls at stopped when revved up from idle.
The cruise control switch could have an issue and may have shorted the contacts inside the switch terminals. For the engine stalling after pushing on the throttle pedal, there could be either a vacuum leak on the engine or the...
Question
I have a 2000 jeep grand Cherokee limited 4.7L V8. I was gone for a month in a half tried starting my jeep up yesterday and nothin
It may be normal engine electrical drain on the battery if the vehicle sat for a month or more. Once the battery is recharged fully then you can see if it will idle again. Just jumping off and only running...
Question
My 94 jaguar idles rough, stutters then cuts out. This happens when engine is cold or warm.
Check for a vacuum leak on the engine. A vacuum leak will cause the engine to rough rough and stall out when the engine is cold or hot. If there is no vacuum leak, then the Mass Air Flow Sensor...
Question
My Camry is starting at 2000 rpm's.
Sounds like there is a vacuum leak that is causing the engine to rev up high. If there is no vacuum leak, then the Idle Air Control Valve could be stuck causing the engine idle to fluctuate on startup. I...
Question
High idle after replacing fuel pump tps and air idle control valve
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...
Question
I have a 2004 Buick Rendevouz that doesn't want to start. At first, it had a hesitation problem and it died at low rp
The camshaft position sensor will make the engine run but poorly. Check the crankshaft position sensor to see if its damaged or unplugged. A damaged crankshaft position sensor will cause a no spark condition. If you need further assistance with...
Question
Loud whine from the front of the engine, and has no power from my turbo. It also idles very high around 2000 rpm.
Check the hose from the MAF sensor to the throttle body and see if there is a leak or if the hose clamps are loose. This will produce a vacuum leak before the intake and make the engine run different...
Question
When I come to a stop my truck stalls and/or shuts off. It also idles real low at a stop 2008 Toyota Tacoma
Hello - first task is to check for blown fuses, failure of the cigarette lighter circuit may indicate additional wiring problems. The stalling at idle and low idle speed may indicate a failed or dirty idle air control valve or...
Question
Throttle body changed 3 days ago. Idle relearn performed and still high idle and revving while in park.
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...
Question
My Lincoln ls 2004 has 9 codes at onece
Hi there. Your vehicle is in a lean mixture state. The fuel system is not supplying enough fuel to the engine. Check the fuel pump to see if its working by putting on a fuel pressure hose on the fuel...
Question
What does my car start shaking when idling 1997 Ford Taurus
Hello. This can be caused by a number of things. Most of the time the issue is caused from a vacuum leak in the engine or a failure in the idle control valve. This is only true if the issue...
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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