Idling problem

I was driving the car slowed down and it turned off I went to turn it back on and it was struggling I hit the gas to keep it from turning off but I had to keep hitting the gas It still turned off. I turned the ignition again and again and again and tap the gas as I was doing it until it finally turned on but it felt like it wanted to turn off again so I had to keep the gas level at a certain speed to keep it from turning off what is this problem

My car has 1700000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi There,
Depending on how long this condition lasts, you may have either a faulty or dirty idle air control valve or a problem with the enrichment process when the car starts up in colder weather. If the condition goes away once it is warm, then this is like a cold start enrichment problem. As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your vehicle in the morning and turn the key to on, the coolant temperature sensor reads the temperature of the coolant and relays this to the computer indicating that the coolant is cold. The computer then knows that it needs to enrich (add more fuel) the air/fuel mixture at startup due to the change in air density. When you start the car, you will notice that it idles high for a period of time until the engine warms up. This is the enrichment cold start process. This is done with what is called a cold start injector or cold start valve which injects more fuel into the motor until the engine reaches a specific operating temperature. The computer simply feeds a little extra gas through the fuel injectors to start the engine and then maintains a certain amount of fuel supply to the motor until it is warm. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle and diagnose your cold start issue.

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 Nissan Maxima has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
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.
An idle air control valve, also called an idle air sensor control motor, is an electrically operated valve that controls the amount of air that bypasses the throttle plate in cars with a fuel injection system [source: Autozone]. This causes the idling speed of the engine to change as needed.
A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.
Oxygen (O2) sensor

An oxygen sensor monitors and analyzes the amount of oxygen in a vehicle`s exhaust system after combustion. A dirty, damaged or malfunctioning O2 sensor (or sensors) affects the air/fuel mixture, causing the engine to idle rough.

One of the main reasons why your vehicle could be vibrating at idle could be due to worn out spark plugs. When a vehicle`s spark plug is faulty, it can interfere with the air-fuel ratio leading to improperly firing cylinders, resulting in a misfire while idling. Replacing your spark plugs will solve this problem.
Shaking or vibration may be caused by many different things such as faulty spark plugs, poor fuel pressure or misfires. Other things such as a faulty idle air control valve may cause the engine idle to drop below the normal idling RPM which may also cause the motor to shake or vibrate more than normal.
Yes. While the damage may seem small initially, the longer you drive with a bad oxygen sensor, the worse the damage will become. Eventually, you may experience rough idling, poor acceleration, engine misfires, an illuminated check engine light, and failed emission tests.
The Idle air control valve or the IAC valve controls your engine`s idle speed and is controlled by the engine`s onboard engine computer system. The IAC valve controls the amount of air circulating around the closed throttle plate. It has solenoid or a valve-operating coil which opens and closes to regulate airflow.
In modern vehicles, engine idle speed is most often controlled by the idle air control (IAC) motor. This can be impacted by bad fuses in many different electronic systems in your car. Next, your high idling could be caused by a computer malfunction.
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.
A PCV valve that`s stuck open will allow too much air to enter the intake manifold, leading to a leaner idling fuel-air mixture. Stuck closed leads to a build up of pressure in the crank case which creates a variety of oil leaks! And this in turn can lead to a range of issues, including a rough idle.
How to fix it? Cleaning or replacing the fuel filter and adding a fuel injector cleaning treatment to the fuel tank should take care of clogged fuel injectors. If the rough idle persists, it`s time to take your car to an auto repair shop.
One of the main reasons why your vehicle could be vibrating at idle could be due to worn out spark plugs. When a vehicle`s spark plug is faulty, it can interfere with the air-fuel ratio leading to improperly firing cylinders, resulting in a misfire while idling. Replacing your spark plugs will solve this problem.
The most common cause of the shaking most often happens near your tires and rims. The tires and wheels connect your vehicle to the road, and if anything is a bit wonky, will notice. It may be something like a broken transmission or a broken control arm.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

High idling, jumping while idling, idle air control valve code
ANSWER : Hi there. This can be caused by the issues that you mentioned or a number of other things. You need to make sure all of the connectors are making good contact. I would then need to know what codes are in the computer to know if this is a circuit issue or not. Most of the time, it is not the circuit but instead a vacuum leak.

If there is a vacuum leak, then the vehicle will act like this and the computer cannot control the idle. Most of the time it is a bad hose or an EGR valve that is stuck open. That is the most common cause for this. I typically remove the EGR to check it to feel the diaphragm on the bottom of it to see if it is moving correctly. If you need to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair your car’s idling issue.

Read Full Q/A … : Idling problem

After replacing the power steering pump there was a low idle, idle screw is all out, running rich, and idle speed doesn’t change.
ANSWER : Hi there. The engine has a vacuum leak and is causing the engine to stumble down on the idle. Check all of the vacuum hoses and the brake booster for any leaks. The engine is rich for it’s not burning all of the fuel properly and may also have bad spark plugs. If you need further assistance with engine not adjusting the idle, then seek out a professional, such as one from Your Mechanic, to help you.

Read Full Q/A … : Idling problem

Rough idling when cold, would not idle when it warms up
ANSWER : Hello. It sounds like you have already changed a lot of parts on this. Most of the time, the issue is actually caused by a leaking intake manifold gasket. This is the most common issue on this vehicle. It leaks and causes a serious vacuum leak which affects the engine as you mentioned, but allows it to run fine at higher speeds or better once it is warm. If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your car’s rough idling issue.

Read Full Q/A … : Idling problem

Low idle problem
ANSWER : Hi there. If the idle control valve is good then the problem is typically caused by a vacuum leak or an issue with the throttle body. I usually check the engine for vacuum leaks first. It may be a vacuum leak in one of the hoses or in the intake manifold. The intake gasket is a common failure.

If there are no vacuum leaks, then I would test the throttle position sensor to make sure it is reading correctly. If it is also reading fine, then I would check the throttle body itself. If the bore or plate is worn then this will occur. If you want to have this low idle problem inspected, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

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Idle Problem/Engine Misfire Code P0300 P0301 P0303
ANSWER : Hi there. Check the spark plugs and fuel injectors for cylinder 1 and cylinder 3. Both cylinders are misfiring. If the plugs are good and the fuel injectors are firing, then there could be a problem with the internals of the cylinders. There could be a burned valve or the rings on the pistons could be stuck shut. Put a compression test on all of the cylinders and check the compression. If cylinders 1 and 3 are lower than cylinders 2 and 4, then there is a leak in the cylinders. Then you would need to put in a leak down tester (requires compressed air) and check to see exactly where the leak is coming from. If you need further assistance with your engine misfiring, then seek out a professional, such as one from Your Mechanic, to help you.

Read Full Q/A … : Idling problem

Rattling noise upon starting and then louder rattling at idle if load is placed on engine such as A/C
ANSWER : Hi there. Given your mileage and your maintenance of the idler pulley, your problem is likely worn/weak hydraulic lifters (or other valve train wear) or the timing gear set. Starting the engine briefly (less than 30 seconds) without the serpentine belt attached, will eliminate noises from all accessories if the problem is with one of them. I would recommend having the engine inspected in person by a professional so that the rattling noise can be diagnosed and properly corrected.

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High Idle, stalls when a/c or defrost is turned on and dies completely after some rough idling. If turned back off car is fine.
ANSWER : Hi there. The fact you able to get the idle speed to drop by tapping the gas pedal, lead me to believe the high idle is due to a sticking accelerator cable. Another possibility could be, a faulty throttle body not allowing the throttle to return to the closed position. Proper diagnoses should be performed to avoid unnecessary repairs. I recommend having your vehicles high idle be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Read Full Q/A … : Idling problem

My car runs rough at idle, stalls at idle, surges, and idles at 40 miles an hour
ANSWER : A number of components or faults can cause your issues. A vacuum leak can cause your issues. Depending on the vehicle, components such as the mass airflow sensor, throttle position sensor, coolant temperature sensor, and a number of others can be the cause. Since randomly replacing parts can get expensive as most electronic components are not returnable once installed, having a certified technician, such as one from YourMechanic, diagnose the stalling/surging is the best place to start.

Read Full Q/A … : Idling problem