Why is my Subaru idling high?
Why is my Subaru idling high?
Malfunctioning Throttle: A malfunctioning throttle system can cause both a high or low idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit.
What sensor can cause high idle?
A torn or disconnected air cleaner tube between the mass air flow (MAF) sensor and the throttle body can also cause the idle to increase. This is unmetered air that the MAF sensor is not reporting to the car’s computer, but the oxygen (O2) sensor will detect.
What causes an engine to idle too high?
Possible Causes of High Idle Speed The engine may be overheating, and the cooling system might need repair. The fuel pressure regulator may be operating at too low of a pressure and might need to be replaced. The Ignition timing might be in need of adjusting.
How do I reset my idle speed?
You can reset the idle air control (IAC) valve by turning the car on, putting the car into park, pressing the brake down, then pushing the gas pedal down, counting down about 5 seconds, turning the car off, waiting 10 seconds and start the car again, checking to see if the car is idling properly.
How do you fix high idle after cleaning throttle body?
Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel. The idle will relearn if you put the vehicle in drive and allow the idle to come down with all accessories off for about two to three minutes.
Can mass air flow cause high idle?
When this is not working properly, this may cause an erratic idle as you have described. This may also be caused potentially by an intake air leak or a vacuum leak as this will create a lean fuel condition also causing a higher idle speed.
What is idle relearn?
In the event you are experiencing an erratic idle after loading a tune or after performing any action that clears KAM (Keep Alive Memory), an Idle Relearn can help you get back on track. The KAM or “Keep Alive Memory” is the memory that is stored in the powertrain control module (PCM).
Why does my Subaru idle rough?
The most common reasons a Subaru Outback has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
Can cleaning the throttle body cause high idle?
While the fuel-injector section is rarely do-it-yourself, many people will try and clean their throttle body. While easy enough to do, in theory, it can often be done incorrectly and result in an erratic or high idle in your car.