What causes intermittent rough idle?
Causes of a rough idle. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues.
Why does my car sputter when I come to a stop?
Most of the time this symptom is caused by a low oil level, a clogged oil filter, or possibly the wrong weight oil. If the oil is fine then the issue may be with the variable valve timing solenoid or actuator.
What is a surging idle?
An idle surge can be caused by multiple phenomena. The idle air controller is simply a computer-controlled motor that controls idle. There could also be another sensor that is telling the computer to compensate, and in turn, this causes the idle to surge as it looks for the correct RPM level.
What causes a forester to run rough at idle?
Really, your Forester will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Forester happens to have them, they can go bad and cause a rough idle.
Why does my Chevy Silverado have rough idle?
An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes. We’ll cover the most common causes of rough idle below.
What causes an Audi A4 to idle rough?
A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist. If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.
Why are the spark plugs on my Subaru Forester not working?
Spark Plugs – One of the absolute most common causes (if not the most common reason that your Forester may be misfiring) is the spark plugs. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.