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Idling

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Symptoms of a Bad or Failing Air Injection Hose
Check your car's air injection hose for signs of damage. If there are idling issues or the Check Engine Light turns on, you may have to replace it.
The Importance of Warming Your Car Before Driving
Scandphoto / Shutterstock.com Many people feel that it’s important to warm a vehicle up before driving off. This has long been the dominant school of thought, dating from when cars had...
5 Essential Things to Know About Idling
Everyone does it, whether waiting for the kids to get out of school or someone running into the store for an item or two. The problem is, idling, which occurs when you sit with...

Related questions

Question
My car has a high or surging idle
Hi there: The throttle position sensor is the most common component that causes similar idle issues you're experiencing, so it makes sense that replacing the TPS might be a good start. However, other issues could include dirty throttle body or...
Question
When stopped at a light rpm will dip from 600 to 500 can then move back up
Although the idle speed can be adjusted, the idle speed of the engine is optimized by the manufacturer for maximum performance and economy of operation. In practice, therefore, there is no value in making any adjustment. Low and/or unstable idle...
Question
Why do I get heavy fumes smell while the car idles?
Hi there. Check the ignition system to see if the spark plugs have wet fuel on them. If they have fuel on them, then check to see if the spark plug wires are good and have any burn spots. Check...
Question
Car sat for a year now it keeps dying, so what could be wrong?
If the vehicle sat for a year with a partially filled tank of gasoline, the gasoline has oxidized and components of the fuel have separated out and turned to varnish. If that is the case, the fuel injectors are likely...
Question
Rough idle and smoking issue
Hello there, many faults will cause your 1999 Dodge Durango to have a rough idle and smoke. There are several different colors of smoke that can come from and engine. Grey smoke is typically oil, black smoke is unburnt fuel...
Question
Rough idle at stops lights and when parked
This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...
Question
engine rev up and down on idle
This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at...
Question
Q: Vehicle stalls both at idle and while moving without triggering any check engine codes.
This is usually caused by a bad connection from a main power source. On your Dakota, this would be a fusible link or fuse coming directly from the battery. The fuses will be in the power distribution center under the...
Question
My truck shakes while idling when the heat, AC and in-cab fan are on
This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...
Question
Truck will act like it is not getting enough fuel when cruisng. RPMs drop then comes back up or under load
Hello. I think you have called it, this is almost certainly a fuel supply issue. Installing a fuel pump pressure gauge which can be observed while driving will confirm this. Sources could include a worn out fuel pump, a fuel...
Question
My 2001 Lincoln Continental misfires while idling.
You may have an engine vacuum leak causing the engine to have a rough idle. The most common cause may be the PCV hose leaking at the connection of the hose where it connects to the back of the intake...
Question
Rough idle and stalling with exhaust popping
The first thing to do is to get rid of the oil type air filter. This oil bath type filter can cause the mass air flow to be contaminated with the oil from the filter you are using. You should...
Question
My car's fuel efficiency is poor and it starts rough
There is a valve that is by the fuel neck next to the fuel filler inlet that measures the fumes from the gas cap and related areas. This valve is known as the EVAP purge solenoid valve. This valve controls...
Question
My car runs poorly when the idle sensor is connected, without it the car runs fine
The throttle position sensor is designed to monitor the position of the throttle butterfly valve in relation to the throttle pedal position. If the engine runs rough when it is plugged in and runs fine when it is unplugged, then...
Question
Car is idling rough and missing
This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...
Question
Vehicle turns off at any rpm, at idle or highway speeds, without stumbling or warning.
This kind of a stalling issue can be caused by a variety of problems. They are typically caused by ignition faults, wiring faults, and fuel issues. Although you do not have a Check Engine Light on, you should still scan...
Question
The car idles fine. It revs up but slowly drops RPMs.
Hi there: The idle is controlled by the idle control valve, mass air flow sensor, and throttle body of a fuel injected motor. Any of these components could be dirty, damaged, or have faulty wiring that is causing your engine...
Question
My car stalls at idle; the battery is good, so is it the alternator?
This sounds like a potential problem with the charging system. The primary function of the battery is to start the vehicle. Once it is running, the alternator provides all electrical power for the vehicle. However, the battery does function as...
Question
Rough idle and SEL is flashing. I've replaced all 6 plugs and coil packs. The car still has a rough idle and no power.
Misfiring can be caused by lack of spark or lack of fuel. If the same cylinders are still showing codes for misfiring after replacing the coils, the problem can lie elsewhere. If it is the coils not firing, there can...
Question
2009 Subaru Forester Runs Rough
There are numerous potential causes for your concern. Your vehicle has electronic throttle control, as you mentioned. In this system, a stepper motor integrated into the throttle body is used to control throttle position. The main inputs for throttle control...

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