Skip the auto shop - Our mechanics make house calls

Q: vehicle won't turn on or start.

asked by on

the vehicle started by taking slightly longer to start then later a check engine light came up for crank position sensor and was replaced by Mercedes benz 4 months ago and at the time I complained about the slow start and they said they checked the starter and it was good. infact they say all was goo except I need to replace gaskets as it had started to leak. the slow start kept getting worst and vehicle kept taking longer and longer to start until just wont start at all 5 days ago. head lights come on but nothing happens when I turn the keys. I just replaced the fuel filter and pump two days ago but still the same. any help will be greatly appreciated.

My car has 105000 miles.
My car has an automatic transmission.

Hi there. Check the battery and see if it has a full charge. If the battery has a full charge of 12.6 volts, then put a load tester on the battery and check to see if the battery will hold a load at the minimum or 11.5 volts for 30 seconds. If the battery drops lower than 11.5 volts during the load test, then the battery needs replaced. If the battery is good but had to be charged, then check the alternator (when you can get the engine to start) and make sure that its functioning and charging the battery. There should be a voltage of 13.5 to 14.7. Also, turn on the high beams and operate all of the power windows at the same time with the engine at 2,000 rpm and see if the lights dim. If the lights dim, then the alternator is not producing enough amperage for what the vehicle needs. Then the alternator would need replaced. If you need further assistance troubleshooting your vehicle, then seek out a technician, such as one from Your Mechanic, that can assist you with your engine not starting.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. vehicle won't turn on or 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 caps at 3000 rpm's, no cel light, and no smoke of any color. Uncaps when restart the engine.

Hi there. There could be an issue with the fuel system causing the engine to stumble and bang at times. Check the fuel / water separator on the vehicle and see if its been replaced before. If not, then the...

Q: My car won't start - Hyundai Elantra

The first step that should be done is to have a certified technician, such as one from YourMechanic, download any error codes for you and diagnose your illuminated Check Engine Light. If you have a professional digital scanner, you can...

Q: My truck randomly dies and won't start for hours

The most common cause for this problem is the ignition module and ignition coil causing the no spark condition. I would recommend having the spark tested when the no start condition is happening so the problem can be isolated to...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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.