What are the causes of unstable idle speed in the Malibu?
2 Answers
The unstable idle speed issue in the Malibu may be caused by factors such as low ignition energy leading to shaking, improper air-fuel mixture causing vibrations, malfunctioning coolant temperature sensor resulting in instability, or uneven cylinder performance causing tremors. Below is relevant information: 1. Overview: The SAIC-GM Chevrolet Malibu XL was officially launched on February 27, 2016, with the hybrid version released on September 9. The Chevrolet Malibu XL is a business vehicle under the Chevrolet brand, equipped with 1.3T and 2.0T engines to meet the demands of business receptions. 2. Additional Information: As Chevrolet's flagship mid-to-high-end sedan, the 2019 Malibu XL is built on GM's most advanced global mid-to-high-end vehicle platform, fully incorporating GM's next-generation drivetrain system developed with intelligent driving technology, world-leading smart manufacturing, and high-standard global supply chains.
Last time my Malibu had the same issue, the idle speed needle was dancing around. I focused on checking three areas: the throttle body was caked with carbon deposits like a layer of black sesame paste, and it smoothed out after cleaning; the spark plugs were pulled out and the electrodes were completely burnt, so I replaced them with a new set; also, there was a small crack in a vacuum hose, causing a hissing air leak at idle. It's recommended to check the PCV valve when cleaning the throttle body, as a clogged one can also cause the engine to struggle for air. My car had this problem at 80,000 kilometers, and the mechanic said cars that frequently encounter city traffic jams need to check these areas more often.
