Skip the auto shop - Our mechanics make house calls

Q: oil light on. Will not start.

asked by on

I got a oil light and it started to make a knocking noise. Pulled over and it started smoking from the oil cap. We added oil and coolant (has a leak) and went to start her up, and it will turn over but will not start. It acts like it wants to but will no actually do it. Is this something that can be fixed?

My car has 156000 miles.
My car has an automatic transmission.

The low oil level and knocking noise may be very likely related in that this may have caused a number of things to fail such as crankshaft bearings or rod bearings. Depending on the severity of this, it may have damaged a crankshaft journal as well. Low oil combined with low coolant creates an extremely hot motor, causing damage to many different components. This also can cause the cylinder head gasket to fail as well which in turn creates a compression leak that may be responsible for the engine not starting now. When this happens, the cylinders will not generate enough compression to create the proper combustion for the engine to start. If you need assistance, a certified YourMechanic technician can help inspect your vehicle’s starting issues in relation with this knocking noise and suggest any necessary repairs.

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

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: hi, the heat in my car doesn't work and the car is overheating. plus the fan is not running. what do you believe to be the problem

Hi there. This one is actually very simple to diagnose. There is one component on all cars, trucks and SUV's that warm up the heater and impact the coolant system - the heater core. The heater core is supplied with...

Q: Feel lurching sensation under brake pedal.

Hi there. Were the brake pads on the rear replaced or only cleaned? When gear oil leaks onto the brake components long enough to feel it in the pedal, then the pads are pretty saturated as well. As with any...

Q: Check engine light is on with codes U110C and U0140

Have the battery checked first to see if it is okay. If the problem continues, then the body control module may not be working properly and would need to be replaced and programmed with a new body control module. This...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...