would not stay started

I just bought a Sierra 1500 SLE 2wd. I purchased the demo from the dealer with about 4600 miles on it, and it now has 6500 miles on it. I got in the truck and it started just fine, but it wouldn't stay started. It would start up just fine but the speed would slowly become less and less. The truck would vibrate badly and the speed was bouncing around. Then it died in about 25 seconds. There were no warning lights of any kind. I could start the truck, but then the same process would repeat itself. I tried starting it 30 more times. Then I had it towed to GMC. When I went to pick up
Experienced mechanics share their insights in answering this question :
Hello. Most of the time this is caused by a voltage issue. If the battery was low or if there was a bad connection at the battery then this can occur. More than likely they charged the battery and checked the connections and that took care of it. The dealer should have told you what it took to fix it. If you continue to have this problem, a certified mobile mechanic from YourMechanic can visit your home or office to inspect why your truck is shutting off.

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 GMC Sierra 1500 won`t start are a dead battery, an alternator problem, or failed starter.
Battery issues, including the battery being dead or the terminals getting corroded, are the most common cause of this issue, and the first thing most mechanics will look at. Blown fuses and relays can cause this problem, too.
Any unusual shaking or vibrating forces coming from the engine is cause for concern. It could be something as simple as old spark plugs producing an uneven power delivery, it could be something serious like worn or broken engine mounts, or it could be even more serious in the case of internal engine damage.
General Motors, the Chevy Shake is caused by faulty 8-speed transmissions and/or torque converters. The hydraulic systems and gears don`t work properly because of internal issues in the 8L45 and 8L90 transmissions. The 8-speed transmissions and/or torque converters cause friction between surfaces.
Why won`t my car start but I have power? If you attempt to start up your car but the engine won`t turn over and the dashboard lights up, then you most likely have an issue with your battery. You could have a damaged or corroded battery terminal, which is stopping the engine from starting up when you fully turn the key.
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 prevalent cause of vibration is problems with your wheels or tires. The potential problems include improper wheel and tire balance, uneven tire wear, separated tire tread, out of round tires, damaged wheels and even loose lug nuts.
The shaking during the start-up problem points to a loose part or combustion problems. Either the engine mounts are loose, or the fuel pressure is low. Worn-out spark plug and low coolant temperature can also be the cause. The shaking can be unnerving, and even though it stops after some time, it needs checking.
This is a common symptom of a plug or wire electrical current problem. Air or Vacuum Hose – Another common cause for engine vibration and power loss is when air or vacuum hoses come loose, begin to leak, or rupture. The three necessities for all combustion engines are air, fuel, and spark.
Some simple warning signs that the transmission is having problems: Transmission is slow to respond when shifting. Grinding, shaking, vibrating.
This is a common symptom of a plug or wire electrical current problem. Air or Vacuum Hose — Another common cause for engine vibration and power loss is when air or vacuum hoses come loose, begin to leak, or rupture. The three necessities for all combustion engines are air, fuel, and spark.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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.

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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.

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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.

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would not stay started
ANSWER : Hello. Most of the time this is caused by a voltage issue. If the battery was low or if there was a bad connection at the battery then this can occur. More than likely they charged the battery and checked the connections and that took care of it. The dealer should have told you what it took to fix it. If you continue to have this problem, a certified mobile mechanic from YourMechanic can visit your home or office to inspect why your truck is shutting off.

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The car crank but won’t start
ANSWER : Hi there. This does sound like an issue with the wiring. If the check engine light is coming on every now and then this means that when it does not come on there is no power to the computer. This can be the wiring harness issue or an ignition switch problem. I would have to test for voltage to the computer when the problem is occurring to be able to find where the issue lies. If you need assistance, a certified YourMechanic technician can be dispatched to your location to inspect your vehicle’s non-start issue and suggest any necessary repairs.

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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.

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I changed the fuel pump and truck ran great for 3 days. Now after 3 days, the truck dies. It will start running for a few minutes, then dies like before.
ANSWER : Hi there, thanks for writing in. I’d be happy to help. It sounds like you should disconnect the connector to the fuel pump and inspect it for any signs of getting hot. The female connections may be too loose on the fuel pump and lose contact after running and getting hot. If there are indeed any signs of problems, then I’d suggest replacing connector and adding dielectric lube to pins before installation. This should solve the problem, but if you continue to experience issues, feel free to reach out to us for help again.

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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.

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