Car Cranks But Won't Fire
When the engine turns over normally but never actually starts, here's what's usually wrong.
A car that cranks normally but never fires up is telling you the starting system is working fine — the fault lies with fuel, ignition, or a security system stopping the engine from running. Here's how we narrow it down.
How the fault is showing up
- The engine cranks at normal speed but never catches
- You can smell fuel but the engine still won't start
- The engine briefly fires then dies immediately
- A security or immobiliser light flashes on the dashboard
- The problem started suddenly, with no prior warning signs
Most likely causes
- No fuel reaching the engine — a failed fuel pump or blocked filter
- No spark reaching the cylinders — ignition coil or spark plug failure
- An immobiliser fault preventing the engine management system from allowing a start
- A failed crankshaft or camshaft position sensor
- A snapped timing belt or chain — a serious fault needing immediate inspection
How it's diagnosed
We check for spark and fuel delivery first, since a missing one of the two is the most common cause. If both are present, we move to checking the crank and cam sensors and the immobiliser system. A snapped timing belt is checked for early if the symptoms and mileage point that way.
What to do next
Stop trying to start the car after a few attempts — repeated cranking without ignition can flood the engine with fuel or drain the battery. If you hear a sudden bang or rattle before it stopped starting, don't attempt to crank it further, as this can suggest a timing belt failure that risks serious engine damage.
Frequently asked questions
Cranking means the starter motor is turning the engine over normally — the issue is that fuel or spark isn't reaching the cylinders to actually run it.
Cranking but not starting? Let's find out why.