Symptom
It cuts out when idling
The engine stalls specifically when idling — at a stop sign or in traffic — but runs fine at speed, which points…
SeverityModerate
Symptoms
Symptom
It has lost turbo boost
On a turbocharged engine, a noticeable loss of the usual power surge under boost, sometimes with a hissing sound, points to a…
SeverityModerate
Symptom
It accelerates slowly
Noticeably slower acceleration than the vehicle normally has, without a dashboard warning light or a distinct hesitation/misfire feel — often a gradual,…
SeverityLow
Symptom
A ticking noise from the engine
A lighter, faster ticking sound (distinct from a deeper knock) is most often valvetrain-related — lifters, low oil, or an exhaust leak…
SeverityLow
Symptom
A knocking or pinging noise from the engine
A metallic knocking or pinging sound from the engine, especially under load or acceleration, can range from harmless low-octane fuel knock to…
SeverityHigh
Symptom
It vibrates when sitting still with the engine running
A vibration felt through the seat, floor, or steering wheel specifically at idle, that reduces or disappears once moving, usually points to…
SeverityLow
Symptom
The revs surge up and down on their own
The engine speed rises and falls without corresponding throttle input, usually at idle or light cruise — this points to the engine…
SeverityModerate
Symptom
I can feel it stumbling or shuddering
A felt stumble or shudder, distinct from a smooth power delivery, usually points to a misfire — one or more cylinders not…
SeverityModerate
Symptom
A burning smell from the brakes
A burning smell from the brakes can have more than one cause. Record when it happens, check for related warning lights or…
Symptom
The brake pedal is very hard to press
The brake pedal is very hard to press can have more than one cause. Record when it happens, check for related warning…