Rough idle or shaking at a standstill
A misfire is often most noticeable when the car is idling and the engine no longer feels smooth.
Read related guide →
Engine fault guide
Engine misfire symptoms and causes
An engine misfire can make a car feel rough, hesitant, underpowered or shaky, and it is one of the most common reasons drivers search for fault advice online. This guide explains the usual symptoms, common causes and when a misfire should be treated as more urgent.
What a misfire feels like
Common engine misfire symptoms
A misfire happens when one or more cylinders are not firing properly. The result can range from a slight unevenness to obvious shaking and very poor performance.
Hesitation or jerking under load
Misfires often show up when accelerating, climbing hills or asking the engine to work harder.
Read related guide →Engine management light appears
A misfire commonly triggers the engine management light and may sometimes cause it to flash.
Read guide →Loss of power
The car may feel flat, reluctant to accelerate or noticeably weaker than normal.
Read related guide →Rough running when cold
Some misfires are worst during cold starts before the engine settles and warms up.
Read related guide →Hard starting or poor restarting
If the underlying fault worsens, the car may become harder to start as well as running badly.
Read related guide →
Common causes
Why an engine may misfire
A misfire can be caused by ignition, fuel, air or sensor problems, which is why proper diagnosis matters more than guessing.
Weak spark or ignition faults
Ignition-related problems are a common cause of uneven running, shaking and warning lights.
Fuel delivery or injector issues
If fuel is not delivered evenly, the engine may run rough and hesitate under load.
Airflow or sensor faults
Some sensor problems upset the air-fuel mixture and make misfire symptoms more obvious.
Neglected maintenance
Overdue servicing can contribute to poor running and make minor issues harder to spot early.
Read servicing guide →Diesel running faults
Some diesel drivability problems can feel similar to a misfire, especially with emissions-related faults.
Read guide →Low voltage or charging issues
Electrical weakness does not cause every misfire, but it can worsen running quality in some cases.
Read guide →Warning signs that matter most
- 1The engine management light is flashing rather than steady
- 2The car shakes heavily and runs very roughly
- 3Power loss is severe or the car feels unsafe in traffic
- 4There is smoke, strong fuel smell or overheating
- 5The fault keeps getting worse or the car starts poorly
How to approach a suspected misfire
1. Notice the pattern
Cold only, hot only, idle only or under acceleration can all help narrow the likely cause.
2. Check the warning lights
Warning lights often point you toward engine, emissions or drivability issues more quickly.
3. Avoid guessing at parts
Misfires have several possible causes, so random parts replacement often wastes money.
4. Confirm the fault properly
Fault-code reading and proper checks usually save more time than guessing from one symptom.
Related help
Useful pages this topic links into
This page strengthens your rough-running and engine-warning cluster and gives search engines a clearer path between connected drivability topics.
Engine Management Light Explained
Useful if the misfire appears with a dashboard warning.
Read guide →Can You Drive With Engine Management Light On?
Helpful when deciding how urgently to treat a misfire-related warning.
Read guide →Car Vibrates at Idle
Useful if the main symptom is shaking or vibration while stopped.
Read guide →Car Rough Idle When Cold
Helpful if the fault is worst during the first few minutes after startup.
Read guide →Car Losing Power When Accelerating
Useful if hesitation and poor performance are part of the same problem.
Read guide →Diagnostics Hub
Browse more warning lights, battery issues and drivability fault guides.
Browse diagnostics →