Can dirty valves cause rough idle?
(EGR) Valves The (EGR) valve is a mechanical device and just like valves and the throttle body; it can develop carbon buildup that prevents it from closing fully. When that happens, the (EGR) valve allows exhaust flow at idle; which causes a rough engine idle condition.
How do you reset the STI on a ECU?
To reset your ECU just disconnect your negative battery cable and just leave your door open to drain the power that might be in the system, do this for about 10 seconds and your done!
How do I reset idle control?
Turn the ignition ON and leave on for several seconds then turn the ignition OFF to allow the ECM to reset the IAC valve. You should be good to go. If you need to adjust your minimum air (idle speed), click here.
How long does it take for an ECU to relearn?
When resetting the ECU it will take about 50km (31 miles) to relearn.
What causes a rough idle on a Subaru Forester?
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. Here’s a great video on how to diagnose bad plug wires with a multimeter.
Why is my Forester stalling at complete stops?
If it still doesn’t work you will probably have to clean the throttle blade on the throttle body cause it is probably gunked up and won’t allow the blade to come to full “seat” position letting it relearn the idle. I just did head gaskets on my forester and had the same problem.
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.
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.