What causes unstable idle speed in Toyota Camry?
2 Answers
Unstable idle speed and vibration are common issues in various vehicles, especially after cold starts when idle speed fluctuations or body shaking are more likely to occur. The root cause of vibration is poor combustion in the cylinders. Here's an introduction to the Toyota Camry: 1. Overview: The Camry is a model under GAC Toyota. For 37 years, successive generations of Camry have consistently led the pack, earning the trust of 20 million owners worldwide and becoming the true king of global mid-to-high-end sedans. 2. Exterior: In terms of exterior design, the eighth-generation Camry features dual styling designs—Luxury and Sport—both derived from Toyota's latest design language. The Luxury version adopts a large trapezoidal horizontal grille, with a streamlined body posture, lower waistline, and extended rear roofline that increases rear headroom. 3. Interior: The interior of the eighth-generation Camry has undergone significant changes. The three variants share the same interior design, differing only in the materials used for the decorative panels above the glove box and around the gear lever.
Unstable idling is a common issue reported by many Camry owners, often caused by worn or excessively aged spark plugs leading to uneven ignition, which results in engine shaking. Another possible cause is a dirty or faulty mass air flow sensor, which controls the intake air volume. If the signal is inaccurate, the ECU cannot properly adjust the air-fuel mixture. The fuel system might also be problematic, such as clogged fuel injectors or excessive carbon buildup in the fuel lines, affecting fuel supply stability. Regularly driving at high speeds helps clear carbon deposits, and spark plugs should be checked periodically—typically replaced every 50,000 kilometers. If unstable idling occurs, don’t delay addressing it, as it can affect driving comfort and, in severe cases, lead to stalling, posing a safety risk. It’s recommended to visit a professional shop to test sensors and diagnose the electrical system.
