Car not starting

The car will not start.
Experienced mechanics share their insights in answering this question :
Many things can keep a vehicle from starting. A failing battery can keep the vehicle from starting because the starting system requires a certain amount of battery voltage in order to turn the motor over. Lack of fuel, spark, our airflow can also cause a no start condition. A failed fuel pump won’t be able to provide sufficient fuel flow to the combustion chamber for the vehicle to start. Failing ignition coils or damaged spark plugs can also keep the vehicle from starting. Mechanical issues like a broken timing belt or damaged valves will keep the motor from running a well. A proper diagnostic should be performed in order to pin point the true problem that is preventing your car from starting. Technicians are readily available here at YourMechanic and would love to be of assistance.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Pontiac Grand Prix won`t start are a dead battery, an alternator problem, or failed starter.
The most common reasons a Pontiac Grand Am won`t start are a dead battery, an alternator problem, or failed starter. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
If one of the cylinders in the engine has low compression, the engine may not be able to start up. This could be caused by a loose timing chain, bad head gasket, stuck valve, or bad piston rings. Whatever the cause, it`s best to have it looked at by an expert.
Check the battery if there is a slow crank and a clicking sound, and the car engine won`t start. However, if the check engine light illuminates, the issue could be the engine or fuel pump. If your vehicle doesn`t start, call AAA, roadside service, or another towing company to take your car to get it repaired.
Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.
Defective ignition switch

If you know your battery is working properly, but your car doesn`t turn over on the first few tries, you might have a problem with the ignition switch. You can try to narrow down the cause of your issue by turning on your headlights.

A dead battery is the most common reason why engines fail to start up. A common reason for batteries to fail is drain. Your car`s battery typically expends a small portion of its storage to start your car up, and then recharges from your alternator as you move.
Answer: The most common source of trouble when the engine cranks but won`t start is the ignition or fuel system. Make sure you got enough fuel pressure and good spark. Also, a faulty sensor (crankshaft position sensor or camshaft sensor on some models or throttle position sensor) may cause this problem as well.
An engine that refuses to start can be another sign of a bad ignition switch. The ignition switch sends power to the the starter motor, engine controls, and ignition controls. These systems may not receive the power they need to start up if the ignition switch isn`t working properly.
A manifold vacuum and/or barometric pressure, throttle position, engine RPM, coolant temperature, and vehicle speed sensor all modify the timing program.
The crankshaft position sensor monitors the position and speed of the crankshaft and other parameters that play an important role when starting the engine. If the crankshaft position sensor is having a problem, the vehicle may have intermittent starting issues or not start at all.
Common Signs of a Bad Starter

The engine won`t turn over. The most common signal that your starter has a problem is if nothing happens when you turn the key or push to start. Unusual noises, such as clinking, grinding and whirring. If you ignore these sounds, it can eventually lead to damage to the engine flywheel.

Crank sensors can fail due to excessive heat, faulty wiring harnesses, and sensor movement.
The ignition relay is one of the most important electronic relays found on modern vehicles. It is usually located in the fuse and relay panel beneath the hood, and is responsible for providing power to the vehicle`s ignition system, and some of the fuel system`s components.
First off, when you have to continually press the gas pedal in order for the engine to start, it means one of two things – either the engine is not getting the right amount of air/fuel ratio or it`s unable to ignite that mixture of fuel and air.
First off, when you have to continually press the gas pedal in order for the engine to start, it means one of two things – either the engine is not getting the right amount of air/fuel ratio or it`s unable to ignite that mixture of fuel and air.
Once the ignition switch is prompted by key or the push of a button, it activates the voltage from the battery to the ignition coil to produce the engine spark. The engine spark from the coil or coils is directed to the spark plugs to ignite the fuel to make the vehicle run.
The starter is a tiny but powerful electric motor that spins a small starter gear. When you turn the key, power is sent to the starter which engages its starter gear with the engine. The starter then “cranks,” creating that unmistakable sound of a car engine starting up.
The magnetic sensor provides position information to the electronic control module, which governs ignition timing.
A load type dynamometer is the best way to accomplish this as the engine can be held at a steady speed and load while the timing is adjusted for maximum output. Using a knock sensor to find the correct timing is one method used to tune an engine. In this method, the timing is advanced until knock occurs.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Read Full Q/A … : Car not starting

car hesitates when trying to start the car ,but when started then i shut car off and start again it will start right up
ANSWER : Hi there:

Sometimes when you have problems starting an engine initially it is caused by a restriction in fuel flow; caused either by clogged fuel injectors or the throttle body that needs to be cleaned. Once the fuel starts to flow and engine warms up, it’s much easier to start. However, it could also be an air filter, EGR valve or other components that causes this issue as well, which is why it’s best to have a professional mobile mechanic complete a car is hard to start inspection so they can pinpoint the source of this issue.

Read Full Q/A … : Car not starting

Map sensor car won’t start up good ?
ANSWER : Your MAP sensor is an important input for your computer. It helps determine the load on the engine to calculate the correct amount of fuel to inject. It sometimes takes a few seconds for the vehicle to realize that the sensor is not producing a good signal.

At that point, it will use other methods to determine the fuel rate, such as pre-programmed fuel maps, throttle position, etc. I would suggest replacing the MAP sensor and retesting. If you would like to have it checked first, a certified technician from YourMechanic will be able to scan your vehicle and test components to determine the root cause of your starting issue before making a repair.

Read Full Q/A … : Car not starting

My car stutter starts, but only after driving it for a few minutes.
ANSWER : Hey there. This may also be caused by what is called the fuel pressure regulator. This is a unit that helps to maintain the fuel pressure at the proper level. When this is not working properly, the fuel pump may be pumping properly, but the fuel may not arrive at the fuel injectors at the proper psi. When this happens, this can cause a lean fuel condition which may cause the car to hesitate, misfire, or stall. If you would like to have an expert pinpoint the issue, a certified professional from YourMechanic can come to your car’s location to inspect the hard start problem and confirm which repairs are needed.

Read Full Q/A … : Car not starting

My car will be starting perfect and when the gas tank gets lower it will start having problems .
ANSWER : Based on the information you gave, it sounds like a possible fuel starvation issue, caused by a partially blocked, in-tank fuel filter or a crack in the fuel pump housing. The remedy would be to replace the fuel pump assembly and filter. The overheating may be caused by several things, including a stuck thermostat, faulty water pump, or even a cracked head gasket. I suggest having a certified technician, like one from YourMechanic, inspect the relevant systems to pinpoint the cause of your vehicle’s hard starting issue and overheating problem.

Read Full Q/A … : Car not starting

I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it’s the computer but…
ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you

Read Full Q/A … : Car not starting

Charging warning light comes on when i turn the key and try to start the car and the car want start but when someone tried to give
ANSWER : Hi there:

If you recently replaced your battery, the issue may be caused by a malfunctioning alternator or other electrical component that comprises the charging system on your Nissan Sentra. The best way to find out which item specifically is faulty, is to have a professional mobile mechanic complete a car is hard to start inspection. This will allow the mechanic to determine the precise source of what’s going on with your Sentra and recommend or complete the right repairs.

Read Full Q/A … : Car not starting

After you sit with the car running, the car starts smoking and eventually starts shaking
ANSWER : Hi, thanks for writing in. It all depends where the smoke is coming from. If it is from the exhaust then your engine be running rich and starting to foul out the spark plugs. Have the computer tested to see if any codes are present that could indicate what is causing the smoke. If you see smoke from the engine compartment then you may be running the engine hot due to low airflow over the radiator. Have the cooling fan checked to make sure it is running. If it is running and the vehicle has the AC running and the blower is on or near high then you may be using more energy than the alternator can keep up with. This can cause the radiator fan to not turn as fast as it should and let the temperature to rise if idled for long periods. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Read Full Q/A … : Car not starting