it turns over but don’t start

It turns over but don't start

My car has 177000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The engine needs three things to start. They are fuel, spark and compression. If you are missing any of these then the car will not start. You may have no fuel from a bad fuel pump, you may have no spark from a bad camshaft or crankshaft sensor issue or you may have no compression from a broken timing belt. The timing belt would be noticeable by the engine turning real fast. No fuel and no spark will sound the same and just will not start. You should have a qualified technician, such as one from YourMechanic, come and diagnose the no start issue for you since there are several possibilities.

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 Saab 9-5 won`t start are a dead battery, an alternator problem, or failed starter.
Most common Saab 9-5 problems

These ignition cassettes are known to misfire or fail, which can cause your engine to stall, not turn on, or become damaged. The 9-5 is also known for frequent oil leaks, usually caused by too much internal oil pressure.

The most common reasons a Saab 9-5 has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
The most common reasons a Saab 9-7x 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 your vehicle won`t start, it`s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter. It can be hard to determine if you`re dealing with a battery or an alternator problem.
The most common reasons a Jaguar XF 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.
The ECU is located on the passenger side under the plastic scuttle panel (below the windscreen). Step 1. Get a Saab 9-5.
This Saab 9-3 engine ECU is a common failure that causes the engine management light to come on followed by the engine cutting out when hot, the car will then fail to restart until the engine cools down again. The ECU fault will usually start out as intermittent but will become more permanent with time.
A bad spark plug could also cause misfiring, surging, or hesitating. Engine misfiring could be caused by a damaged spark plug tip. Engine surging or hesitating could be from the over intake of air into the engine, indicating a potential spark plug issue.
If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.
Check Crankshaft position sensor – Crank No Start

When the motor crank position sensors fail, you will see the following symptom: The Mercedes-Benz engine is turning but won`t start because of the failure of its crank position sensor. Replacing the crank position sensor is simple and fairly inexpensive.

9000 The ECU is located under the left engine compartment plastic cover under the windshield. The main and pump relays are located in the fuse/relay panel behind the glove box.
Why your car struggles to start but runs fine. There are a number of reasons why your car might be slow to start but runs as-normal once it gets going. Causes can vary from weather conditions to battery health, wiring issues, starter motor concerns and fuel-pump health.
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.
But the magazine said that, “The 99 is an excellent and comfortable long distance tourer”, adding: “The attention to detail and abundance of additions is most noteworthy.” Summing up the model in 1972 Car reckoned that, “The Saab is well engineered with almost fanatical attention to detail that matters.” Years later, …
Standard/Upgraded TD04 Turbocharger for Aero models (SAAB 9-5)
The least invasive way to diagnose your ECM is to connect an onboard diagnostic (OBD or OBD II) tool to the diagnostic port. From there, you can scan to see if your engine computers have produced any error codes. There are many of these codes, and your diagnostic tool`s manual should have information on what they mean.
You can use a bench test setup, which simulates the car`s electrical system and sensors, to connect your ECU and check its operation. You can also use a software tool, such as an ECU simulator or a diagnostic scanner, to communicate with your ECU and monitor its parameters, codes, and outputs.
Can a bad spark plug cause a car not to start? Yes. The spark plug ignites the fuel/air mixture inside the cylinder. If the fuel doesn`t burn, the engine doesn`t make power.
The problem may involve an annoying change (up/down) of engine speed while cruising at a steady pace, a low drop (or even cut-out) at idle or when approaching a stop, a wild high engine speed of several thousand rpm followed by a drop to near zero, etc.
The most common signs of bad spark plugs include start-up trouble, rough idling, sluggish acceleration, declining fuel economy, engine misfiring, and engine knocking.
Misfiring due to excessive heat, quenching, increased fuel consumption and even engine failure can occur from the use of incorrect or mismatched spark plugs, so it`s best to replace all of your spark plugs at the same time, and with the correct type of spark plug, to ensure smooth and consistent operation.
Limp mode is a car security feature that activates when a fault is detected, reducing speed and switching off non-essential functions. It is triggered by abnormal signals from car components, such as faulty sensors, transmission issues, or low fluid levels.
What the P0008 code means. P0008 is a generic OBD-II code indicating an issue with the engine control module (ECM) detecting a variation in the mechanical timing between the crankshaft and bank 1 camshaft. The ECM uses sensors to detect the position of the crankshaft and camshaft(s).

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Vehicle won’t start, once it’s jump started it only stays running until you turn it off, then it work start again without jumping.
ANSWER : Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not have enough juice to start it again. Inspect your battery – it should have at least 12.5 to 13 volts to start your car, if it doesn’t you will need to replace the battery. The second problem could be that your alternator is bad and not charging your battery, in this case you will need to replace your alternator. Both the battery and the alternator can be tested in your car. If you would like to have the car checked for you, a certified professional from YourMechanic can come to your car’s location to diagnose the starting problem and proceed with repairs.

Fuel pump engages. Batery good, alternator good volts, jump start helps when wont start. Temp does not matter. Intermittent?
ANSWER : Hello. Thank you for writing in. There are several reasons your vehicle may only start when jump starting. The first and most common is a build up of resistance that is causing you to need a boost of voltage to get the engine started. This may be due to poor battery cables, a bad ground connection, a poor starter solenoid, and a couple of other issues. The first thing you want to do is perform a visual inspection of the starting system. Make sure there is no corrosion build up in the battery cables. You can also check the resistance across these wires and make sure you have a solid connection between components. You then want to make sure the starter solenoid is doing its job. It is responsible for taking the small amount of electricity sent by the ignition and turning it into a huge electrical charge that is strong enough to push over the engine with the help of some gear ratios in its favor. Do some more testing, and stick to the basics before assuming its something seriously complicated.

Car was sometimes not starting, not even cranking when i turned the key then after a few times itd start. Now it ont start at all
ANSWER : Hi there:

Without being there to inspect your vehicle, or having information about what type of car, truck or SUV you own, it’s very hard for us to give you some advice. You might want to have a professional mobile mechanic complete a car is hard to start inspection; so they can come to your location and determine why your vehicle is having these issues.

Car won’t turn over. No lights come on when I turn it. Can’t even lock my doorsvor push the seat up or back.
ANSWER : Your probably correct, it sounds as though your battery is done. But it also sounds like you have charging system issues. I’m not sure that fixing your battery and charging system will solve the problem with the car shutting off, but it’s possible that it will and it’s a darned good place to start. By contacting Your Mechanic, you can have a technician come to your home or office to check out your car and help you figure out what to do next.

I’ve got a 97 Taurus. The other day, I would turn the key and the engine would turn slowly but not start. All of the lights and ra
ANSWER : You should have the battery tested after running the engine to try and charge it up. Have battery load tested to see if it can hold a load and replace it if it cannot. Then have the charging system checked to make sure it is charging at the correct rate.

Cranks over start than dies
ANSWER : Hi There,
The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.

Car turns off
ANSWER : The problem sounds like your alternator has stopped charging the car. This will cause the car to have weak electronics like what you are experiencing. Have the charging system double checked, and if verified as the fault, replace the bad alternator.

What if the VSA turns on during startup and doesn’t turn off and what I do is I turn off the engine and start again. This time aro
ANSWER : Hi there. If the VSA light is coming on and shutting off but does not come back on until the next start, then this is a normal condition as the light is telling the drive that the VSA system is deactivated. There is a switch under the dash to turn on and off the VSA system. Try the switch to see if the light continues to come on or off. If the same issue is occurring, then the wheel speed sensors or the VSA switch has failed. If you need further assistance with your warning VSA light coming on, then seek out a professional, such as one from Your Mechanic, to help you.