Skip the auto shop - Our mechanics make house calls

Q: Dosen't always start

asked by on

it doesn't always start
My car has an automatic transmission.

Hi there. There are a lot of things that can cause this. It really depends on what the car is doing when you are trying to start it. If the engine cranks and it just does not start then most of the time it is a bad crankshaft position sensor. I usually use a scan tool to monitor the sensor signal to see if it is correct when the issue is occurring. If it is not then I replace the sensor.

It can also be a number of other things including a fuel system issue. If the car does nothing when you try starting it then most of the time it is either a bad connection at the battery or a failing starter. It can also be a failing ignition switch or a clutch switch if the vehicle has a manual transmission.

Some electrical diagnostics would need to be done to find out which one it is. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your starting issue firsthand.

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: 1996 mercury grand marquis Crank, no start

Hello, thank you for writing in. The vehicle may be having issues with the ignition module or the fuel pump. Both are good assumptions to work with for the moment. The ignition module is typically mounted to the firewall or...

Q: Cylinder #4 misfire, PO304

In order to know for sure that your problem is with the injector for the number 4 cylinder, is to do a fuel pressure leak down. If the fuel pressure does not leak down after you turn on the key...

Q: Kia cerato 2004 overheated and shut off by itself.

If the engine overheated until it stopped then you may have done internal engine damage that may require engine overhaul or replacement. You should have a coolant pressure test and engine compression test to get the condition of the engine...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...