Skip the auto shop - Our mechanics make house calls

Q: Car won't start

asked by on

Why wont my car start? I bought new ignition coils, replaced the cam shaft sensor, and got a new battery. Car still will not start and battery is draining very quick while car is not even on.

My car has 169212 miles.
My car has an automatic transmission.

Starting issues can be frustrating, so we need to take it one step at a time. I am assuming, due to the fact you are replacing parts like the cam shaft sensor, that your vehicle will crank but not turn over. This would mean the starter is working, and the battery has enough power to engage and crank the starter.

The next symptom to address is the parasitic draw or battery drain. Depending on how you want to do things, you can attempt to diagnose this issue and see if the starting issue is related. If the draw is robbing the battery of power, that would cause it to lack the power it needs. But I do not think that is your problem. If you properly installed the ignition coils correctly and know you are getting good spark, then we can rule out the ignition system.

We should then turn to fuel because it is the most likely to need maintenance. Do you hear the fuel pump prime when the key is turned to accessory? This would sound like a faint "whirling" or impeller sound. If not, check your fuel pump relay and then the fuel pump itself. When was the last time you changed the fuel filter? If it is clogged, the engine will not have fuel available to ignite.

In the same light, dirty or clogged fuel injectors will cause the same issue. If your fuel system checks out, check the air intake, air filter, and related sensors. Sensors may be able to be inspected with a scan tool. Be sure to have a certified mechanic, such as one from YourMechanic, determine why your car will not start to diagnose the exact cause of the 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
  1. Home
  2. Questions
  3. Car won'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: Trunk light stays on when trunk is closed

Hi there. It sounds like the trunk courtesy switch has failed and allowing the light to stay on as if the trunk is open. This switch is usually built into the latch assembly. It can be tested for continuity with...

Q: Engine stalls. Then after 5 minutes or so it will start back up.

Either there is an issue with the brake system or the transmission. If the brake system is free and you can push the vehicle is neutral, then the issue lies with the transmission. The transmission may have a clutch that...

Q: Diesel don't want to come out of diesel pump

This is most likely a computer issue if the pump is working correctly. I would start with diagnosing the computer itself to be sure it is supplying power to the fuel pump. Check the fuel pump relay and fuses as...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...