What Causes the Abnormal Noise in Highlander?

[LeJune]

It may be due to insufficient engine oil. The reasons for abnormal engine noise in Highlander are as follows: Insufficient engine oil: This leads to inadequate lubrication of various components, resulting in wear and noise. Poor fuel combustion: Low injection pressure, injector dripping, poor fuel atomization, and delayed fuel supply timing can all cause poor fuel combustion, leading to knocking. Advanced fuel supply timing: If the fuel injector starts spraying fuel before the piston reaches the designated position, it causes premature fuel combustion. The high-pressure gas in the cylinder impacts the piston, producing a rhythmic sound, which becomes more noticeable when the throttle is reduced. The following is a related introduction to Highlander: Body

[MilaLynn]

My Highlander has been driven for over three years, and recently there's always a plastic friction clicking sound from the center console when driving on rough roads. This is because the internal clips of the dashboard are loose or the wiring harness isn't secured properly, leading to clashes due to thermal expansion and contraction. The creaking sound from the chassis is most likely due to aging and cracking of the lower control arm bushings, which typically need replacement every five years. If you hear a whining sound when turning, it might be because the CV joint boot is torn and sand has gotten inside. Once, the rear seatbelt buckle wasn't retracted, and it kept knocking against the B-pillar throughout the journey. It's recommended to apply undercoating within the first six months of a new car, and spraying some rubber conditioner can delay aging. If there are too many strange noises, it's best to disassemble and re-secure the wiring harness.

[McDallas]

Last time I helped my neighbor check his 150,000-kilometer-old Highlander, the rear suspension made a thumping noise when going over speed bumps. Upon disassembly, we found the shock absorbers were leaking and failed, and the rubber pads on the spring bases were completely shattered. The clicking sound when turning the steering wheel came from the lack of grease in the steering column universal joint. The most troublesome issue was the whistling noise from the transmission at low speeds, which required checking the torque converter and gear clearances. Older cars tend to have many interior rattles—business cards falling into the door panels or leaves accumulating in the sunroof tracks can all cause trouble. The key is to distinguish between high-frequency metallic sounds and low-frequency dull noises, with the former requiring immediate repair.

[RachelDella]

It's really frustrating to experience brake squealing on a new car with only 5,000 kilometers. This could be due to excessive metal particles in the brake pad material or hard spots on the disc surface. In our fleet of five Highlanders, three encountered sunroof rattling, mainly caused by the rubber seals hardening in sub-zero temperatures and rubbing against the tracks. Another common issue is loose screws after installing an engine guard plate, leading to resonant clanging of the steel plate over bumps. It's advisable not to tamper with original factory parts casually and to seek professional shops for modifications. Occasionally, the dashboard's electrical buzzing sound is due to worn gears in the air conditioning flap motor, which can be fixed by replacing the small motor.