Q: My 2014 Kia Forte Ex sounds like it is idling high upon start regardless of weather.

asked by on September 23, 2017

My 2014 Kia Forte Ex sounds like it is ideling high upon start regardless of weather. In the beginning it would idel high and go back down but lately it does not sound that way it stays ideling high. I drive about 150 highway miles a day. I get oil changes every 3000 miles. I do not have a check engine light on. My rpm dile is at 1 rpm when I start up and it sounds high.

My car has 67000 miles.
My car has an automatic transmission.

In the majority of vehicles, engine idle speed is controlled by an idle control valve (ICV). The ICV valve can fail or a faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading to a higher than normal engine idle speed. Failures in the ICV valve itself are often due to excessive carbon buildup in the intake manifold. Other possible causes of a high idle include vacuum leaks, a malfunctioning throttle and, rarely, a PCM/ECM malfunction. With regard to vacuum leaks, on a fuel injected engine a vacuum leak will cause a high engine idle as the engine’s oxygen sensor detect the extra oxygen entering the engine through the vacuum leak. The newly lean (too much air relative to fuel) status will result in the engine’s computer pumping in additional fuel, resulting in an abnormally high idle. A malfunctioning throttle system can cause both a high idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit. If you desire that this high idle problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine idle speed diagnostic - high idle and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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