Common Car Problems – Symptoms, Causes & Fixes
Modern engines can develop a wide range of drivability issues such as hesitation, shaking, misfires, loss of power and lean conditions. This page lists the most common problems, their symptoms, causes and links to full troubleshooting guides.
Most Common Problems
Car shakes when idling
Engine vibration at idle caused by misfires, vacuum leaks or ignition issues.
Car shakes when accelerating
Shaking under load due to ignition coil failure, bad mounts or drivetrain issues.
Car jerks when accelerating
Intermittent power delivery caused by fuel, ignition or airflow problems.
Car misfires
One or more cylinders fail to ignite properly, causing rough running and power loss.
Car runs lean
Too much air and not enough fuel, often caused by vacuum leaks or MAF issues.
Car hesitates when accelerating
Delayed throttle response due to MAF, fuel pressure or ignition problems.
Car loses power when accelerating
Severe power loss caused by fuel pump issues, turbo leaks or clogged catalytic converter.
Recommended Diagnostic Tools
To diagnose the real cause behind any drivability issue, use an OBD2 scanner capable of reading live data, fuel trims and misfire counters.