Posted on 11/28/2025
A new noise that shows up only when you press the pedal is a useful clue. Acceleration loads the engine, exhaust, mounts, and driveline, which means a weak part often speaks up only under throttle. Use this guide to separate harmless chatter from problems that deserve attention in San Jose traffic and on 101 ramps. Start by Splitting Engine RPM From Road Speed Does the pitch rise with engine rpm in Neutral, or only while the vehicle is moving under load? If the sound follows rpm even when stationary, think engine accessories, belts, or exhaust. If the sound appears only while rolling and changes with vehicle speed, focus on wheel bearings, axles, mounts, and heat shields that vibrate under torque. Answering this first keeps you from chasing the wrong system. Engine-Side Noises That Grow With Throttle A sharp chirp or squeal that pops up with A/C on or while climbing a hill points to a belt slip or a weak tensioner. Modern EPDM belts rarely crac ... read more