Skip the auto shop - Our mechanics make house calls

Q: Car was driving fine but when I returned 30 minutes later it wouldn't start.

asked by on

I fitted a new starter motor over 2 months ago and I just bought a new battery 2 days ago. The engine is cranking, it just won't kick over. I then tried changing the spark plugs... still nothing! I have a feeling it's something electrical but I have no idea where to try next. Can anyone help me?

My car has 50000 miles.
My car has a manual transmission.

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition module are faulty, this may cause the motor to not produce the spark needed to ignite the fuel in the motor. If there is a fuel delivery problem, this may be related to low fuel pressure, faulty or dirty fuel injectors, a faulty or dirty idle air control valve (this relays information about air intake to the computer which makes fuel adjustments), or potentially a faulty fuel pressure regulator or fuel pump. Fuel delivery problems will typically not allow the proper amount of fuel to be delivered to the cylinders which results in a lean fuel condition which can cause backfiring or simply cause the motor not to start as a result of fuel starvation. I would recommend having an expert from YourMechanic come to your location to diagnose your no start problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • Car was driving fine but when I returned 30 minutes later it wouldn't start.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine idle fluctuates

You may have a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. Since...

Q: "Service Stabilitrak" has come up on my dash and I do not know what it means?

Hey there. These messages are there to tell you that the main computer has detected an issue with the systems. The warning lights are very general. They can mean the system is malfunctioning, the system has been turned off, or...

Q: Is it dangerous to drive a car when you smell gas?

Hi there. When you opened the hood to add engine oil to the engine and you smelt fuel vapors, there could be an issue with the fuel injectors. Most likely the fuel injector o-rings have split or cracked. When a...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.