If your car is jerking or lurching when you press the accelerator, it’s a sign that something’s not right under the bonnet. While it might feel like a minor annoyance at first, jerking under acceleration could point to a deeper mechanical or performance issue. In this guide, we explore common causes and how to fix them — especially for drivers around Brookvale, Dee Why, Manly and the Northern Beaches.
1. Faulty Spark Plugs
Worn or dirty spark plugs are one of the most common reasons a car jerks during acceleration. When spark plugs misfire, your engine doesn’t receive a consistent spark — causing hesitation, jerking, or poor performance. If it’s been a while since your last tune-up, it’s worth booking in for a logbook service to replace them.
2. Clogged Fuel Injectors
Fuel injectors spray fuel into the engine — but if they’re clogged or dirty, the fuel supply becomes inconsistent. This can cause jerking, stalling, or loss of power. Our mechanics at Beachwheels Automotive can professionally clean or replace injectors during a fuel system service.
3. Dirty or Failing Air Filter
Your engine needs a balanced mix of air and fuel. A clogged air filter can suffocate your engine, especially under heavy acceleration, resulting in a jerky or sluggish response. During a routine vehicle inspection, we’ll check and replace your air filter if needed.
4. Transmission Troubles
If your car jerks as it changes gears, especially in automatic vehicles, your transmission may be slipping or struggling to shift smoothly. This could indicate low transmission fluid, worn components, or sensor issues. Bring your vehicle to our Brookvale workshop for a proper diagnostic before it becomes a bigger problem.
5. Dirty or Faulty Mass Air Flow (MAF) Sensor
The MAF sensor tells your engine how much air is entering so it can adjust fuel delivery. If it’s sending the wrong signals due to dirt or damage, your car may hesitate or jerk under acceleration.
6. Worn Out Engine Mounts
Engine mounts keep the engine stable and reduce vibration. If they’re worn out, the jerking sensation might feel more pronounced during acceleration as the engine shifts position.
7. Issues with the Exhaust System
Blockages or damage in the exhaust system, especially the catalytic converter, can lead to reduced engine performance and jerking. These components play a role in emissions and engine breathing — and when restricted, your car can struggle under load.
Get It Checked Before It Gets Worse
A jerking car can be a symptom of a minor issue — or an early warning of a bigger mechanical fault. Either way, it’s best not to ignore it. At Beachwheels Automotive, our expert mechanics provide thorough diagnostics and repairs for drivers across Brookvale, Manly, Dee Why and the Northern Beaches.
Contact us today to book a service and get your car running smoothly again.
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