What people keep running into with engine noise
Complaints tagged engine noise, each raised by more than one person. One-off posts are not included.
16 recurring problems · 404 people · 5 forums we read
Raised more than once
Most people first.
- 147How to explain an intermittent car noise to a mechanicIntermittent car noises are notoriously difficult to show a mechanic because they often refuse to happen during a test drive. Without proof, drivers struggle to get an accurate diagnosis, sometimes leading them to waste money replacing the wrong parts like sway bar links while the underlying mechanical problem remains unsolved.
- 94How to figure out what an unfamiliar car engine noise isUnfamiliar engine noises like chattering, squeaking, or sounds that change when you turn the steering wheel make it difficult to figure out what is broken. Without knowing the source, car owners cannot tell if the vehicle is safe to drive or what repairs are needed.
- 73Why does my car make a loud rattle when starting the engine?An engine startup rattle indicates a mechanical noise occurring immediately upon ignition. This issue stops the engine from idling smoothly and can cause severe shaking throughout the vehicle cabin.
- 28Why does my car run terribly and stutter after a long drive?Extended driving triggers severe engine sluggishness, unusual valve train noises, and random cylinder misfire codes. These sudden performance drops cause RPM stuttering and electrical warnings that leave drivers stranded and unable to reach a diagnostic scanner.
- 12Car making weird noises after getting servicedNew rattles, clatters, or pops appearing immediately after a mechanic visit usually stem from loose components or unfinished reassembly during the repair. This unexpected transition leaves drivers questioning if their vehicle is actually safe to drive and worried that the shop made a mistake.
- 10Drove several miles with a snapped serpentine belt, did I ruin my engine?Driving with a snapped serpentine belt cuts off crucial functions like the water pump and alternator, risking severe overheating depending on how far and how long you drove. To verify if damage occurred, check your temperature gauge history and inspect the engine for signs of overheating or coolant leaks.
- 8Engine rattling noise and sudden coolant leak while drivingA rattling or knocking noise under acceleration paired with a sudden coolant dump usually points to a severe cooling system failure or overheating issue. Continuing to drive risks catastrophic engine damage, which is why towing it immediately is the safest choice while checking for obvious hose breaks or water pump leaks.
- 8What does a ticking engine noise and flashing check engine light mean?A ticking noise that speeds up during acceleration, combined with a flashing check-engine light, points to an active mechanical misfire or severe internal fault. Because this happens right after major work like a camshaft replacement, drivers cannot safely tell if the vehicle is drivable or on the verge of total engine failure.
- 7Engine still squeaking after replacing water pump and tensionerNew cooling and belt components often fail to resolve an idle squeak because residual load issues — such as a failing AC compressor or auxiliary pulley alignment — keep putting uneven tension on the belt system. This leaves drivers dealing with persistent noises and vibrations that defy straightforward part-swapping fixes.
- 5Knocking noise under car after bottoming out on drivewayImpact to the underside of a vehicle can bend or loosen protective shields, exhaust hangers, or suspension components like the CV axle and control arms. This creates persistent rattling over bumps and when braking, even if the car otherwise drives normally.
- 4Grinding noise and smoke from under the car hoodA grinding sound accompanied by sharp-smelling smoke typically points to either a seized component like a water pump or a heavily slipping drive belt. Continuing to drive risks complete accessory failure or engine overheating, making it necessary to inspect the belts and pulley covers before starting the car again.
- 4Why is my brand new serpentine belt still squeaking?A brand new serpentine belt can still squeak during startup, acceleration, or after driving in the rain. This ongoing noise prevents drivers from resolving the issue with a simple belt replacement alone, often requiring them to investigate pulleys, tensioners, or alignment.
- 4Why does my truck make a rattling noise after I turn it off?An engine can continue to run, sputter, or rattle briefly after the key is turned off, sometimes sounding like droplets hitting a metal pan. This dieseling or run-on phenomenon happens right after putting the vehicle in park, leaving drivers confused about whether it is a fluid leak or mechanical noise.
- 3Is it safe to drive with a noisy AC compressor pulley?A noisy or squealing AC compressor pulley with play risks seizing up and destroying the serpentine belt and surrounding components. This sudden noise leaves drivers unsure whether the play is normal, whether to replace just the moving part or the entire assembly, and if they can safely keep driving.
- 3How to check if a vibrating radiator is caused by a bad fanNoise and vibration coming from under the hood often stem from a damaged radiator fan assembly, bent blades, or a failing fan motor. If left unverified, a broken or non-running fan can lead to poor engine cooling, potential overheating, and costly engine damage.
- 2Car squeaks and shudders when stopped at a lightA rhythmic squeaking or high-pitched chittering noise happens when you press the brakes to wait at a stop sign or light. This noise is sometimes followed by the entire car shuddering, making it feel as if the vehicle is about to stall.
Comes up alongside
Topics that keep appearing on the same problems — not topics with similar names.