What Causes the Cadillac to Shake at 1500 RPM?
2 Answers
Car body shaking is mainly caused by the following reasons: misalignment of the front wheel positioning angle, excessive toe-in. Low front tire pressure or unbalanced tires due to repairs. Deformation of the front wheel spokes or unequal number of tire bolts. Loose installation of transmission system components, etc. Additional Information: Carbon deposits and oil sludge blockages: The throttle body, idle valve, and intake ports can accumulate carbon deposits and oil sludge over time, leading to restricted airflow, which affects idle stability and causes shaking. These parts can be inspected and cleaned with a cleaning agent without needing to be removed. High-voltage wire breakage: A broken high-voltage wire refers to a break in the wire core, which can affect ignition and cause engine shaking. Use a multimeter to measure resistance and replace the wire with significantly higher resistance.
I've seen many Cadillac owners at the repair shop reporting body shaking issues at 1500 RPM. This usually stems from aging or damaged engine mounts. The mounts are responsible for vibration damping, and when worn, they can cause resonance at specific RPMs like around 1500. It could also be an ignition system failure, such as spark plugs reaching the end of their lifespan causing uneven ignition. Another possibility is an imbalanced driveshaft, which exacerbates vibrations at critical points. Other common causes include clogged fuel injectors or unbalanced wheel hubs. It's recommended to first check the mounts and ignition components, use an OBD scanner to read error codes, and if necessary, replace the entire mount assembly. Don't take it lightly, as prolonged shaking can damage the engine or drivetrain, increasing repair costs. For safety, have a professional shop conduct a thorough inspection.
