Car Stalls at Idle

If your car dies every time you come to a stop or sit in traffic, something is disrupting the air-fuel balance at low RPM.

When a car stalls at idle, it typically means the engine isn't getting the right mixture of air and fuel to sustain combustion at low RPMs. The most common causes are a dirty throttle body, a failing idle air control (IAC) valve, or a vacuum leak. A clogged fuel filter or weak fuel pump that can't maintain pressure at low demand can also make the engine stumble and die when you're sitting still.

Vacuum leaks are a frequent offender — a cracked intake hose or a torn PCV valve grommet lets unmetered air into the engine, leaning out the mixture until the engine can't keep running. A dirty mass airflow (MAF) sensor can cause similar symptoms by sending incorrect air readings to the computer. Diagnosis usually starts with scanning for codes and checking for vacuum leaks with a smoke machine.

Stalling at idle is nerve-wracking, especially in Jacksonville traffic. You shouldn't have to drive an unreliable car to a shop. Ez Mobile Mechanic comes to your location — home, work, wherever — and diagnoses the stall right there. No tow truck, no drop-off hassle. We're your mobile mechanic in Jacksonville. Call (904) 788-7272.