Engine shuts off when slowing down or at a complete stop.
I have replaced the EGR valve, the oxygen sensor, and the alternator. Once I replaced the alternator, it stopped cutting off while driving. Now, it only cuts off when I'm slowing down or when the car is idle. When it did this a little under a year ago, they said it was my harmonic balancer. It was shaking violently to the point that it wasn't triggering the crank shaft sensor. They replaced the harmonic balancer and it worked fine until about a month ago when it started shutting off again. They threw me code after code and I fixed all of them to be point that no codes are thrown. And i
Experienced mechanics share their insights in answering this question :
Hello, thanks for writing in. This can be caused by a number of things. From the symptoms that you have though I would start by checking the throttle body. If it is very dirty then the throttle plate may be sticking which will cause this to occur. If the throttle body is clean then I usually check the idle control valve to see if it is functioning as designed. If that is fine also then it may be a bad crank sensor. These will fail and act like this. A scan tool would be needed to watch the signal when this occurs to see if it is bad. 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.
How to Identify and Fix Common car Problems ?
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When your engine shuts off when you slow the car down its often as a result of a: Malfunctioning transmission. Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump. Bad oxygen sensor or mass flow sensor.
If your car stalls when braking, then it usually means you have a vacuum hose blockage in the brake booster or a leaking master cylinder. Or you could have a leak in the ABS system. In either case, this can be difficult to track down without professional help.
The most common reasons a Pontiac Grand Prix engine stalling are the fuel system, the air intake system, or the ignition system. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
If the torque converter is broken, or if there is a low fluid level in the transmission, the converter will not do its job, and the car will be unable to maintain power at low speeds, which causes the engine to shut off. A defective TCS or torque converter solenoid can also cause this issue.
Malfunctioning spark plugs can make an engine stop for a while and resume its normal functioning. It can happen when you are driving. The engine can also sound rough when idle. The misfires affect the proper functioning of your car`s engine due to failing spark plugs that have no power to ignite the fuel-air mixture.
There are three major causes for a stalled engine: A lack of fuel, a lack of air flow and improper ignition. Running out of fuel is one of the most common causes of engine stalling, but dirty fuel injectors or a plugged fuel filter can also be the culprit.
When your vehicle splutters and eventually stalls it could be a sign that your car needs new spark plugs. The spark plugs, while small, are a critical part of your engine and are what “spark” air and fuel mixture in the engine sending power through your vehicle.
Sterling, Virginia — Have you noticed that your car slows down when you let off the gas pedal even before you hit the brakes? Part of the reason you slow down when you lift your foot is because your engine is no longer receiving the fuel it needs to maintain its speed.
The most common reason your car starts then dies immediately is because of a lack of fuel in the engine. This often happens because there is a small amount of fuel in the fuel rail, which helps to start the engine. However, there is no fuel pressure to keep the engine running.
Faulty spark plugs can cause the car to exhibit starting troubles. Worn out plugs does not produce sufficient sparks, which is needed for starting the engine. This results in the engine to stall and fail to start quickly.
Engine stalls are a common sign that your air/fuel mixture is off or your spark plugs need replacement. The stall can also be caused by faulty spark plug wires.
A failing camshaft position sensor begins losing its ability to quickly transfer data. Mismatched fuel delivery and ignition timing, even if off by a few milliseconds, will cause your vehicle to sputter, accelerate poorly, lack power, stall or even shut off.
When the EGR valve is clogged or dirty, as they are prone to, it may not function properly causing the engine idle rough, stall at idle speeds, cause the car to get poor fuel mileage, or emit a strong smell of fuel due to excess hydrocarbons which also results in failing emissions tests.
Will a bad O2 sensor cause rough idle and loss of engine power? You bet. Moreover, you may also notice poor acceleration, engine misfires, and even stalling. Bad oxygen sensors disrupt all kinds of essential engine functions, including engine timing, combustion intervals, and air-fuel ratio.
If the engine stalls while idling or driving, the engine may be running out of fuel or not receiving enough fuel pressure to keep it running. The most likely cause of this kind of stalling would be a fuel pump that is not spinning fast enough or is intermittently cutting out.
There are 3 main types of stalls that pilots train for; Power-Off, Power-On and Accelerated. Learning how to recognize, prevent and recover from each type of stall is an important part of learning to fly.
It is commonly applied to the phenomenon whereby an engine abruptly ceases operating and stops turning. It might be due to not getting enough air, energy, fuel, or electric spark, fuel starvation, a mechanical failure, or in response to a sudden increase in engine load.
Stalling the engine in a manual car is NOT bad for the vehicle, so long as it`s not done 8 or 10 times every day.
Common faults are the battery, alternator, fuel pump, fuel filter, battery cable, coil, or a wiring harness fault.
Common culprits include a faulty fuel pump or fuel pump relay. A clogged fuel filter or bad fuel pressure regulator is also common on return-type fuel systems. Another often overlooked problem is the vehicle simply being out of fuel. Sometimes the fuel gauge breaks or is inaccurate.
Weak Spark
Both spark plugs and ignition coils generally begin to lose power when nearing their service life. However in some instances it is possible for two or more ignition coils to go bad. This would significantly reduce the combustion output and possibly cause the vehicle to stall out.
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
If you are running on a faulty car battery, you are at risk of stalling on the highway. Having your vehicle stall in the middle of the road can be embarrassing and inconveniencing, and in case you don`t have jumper cables, you risk finding yourself stranded in the middle of nowhere.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
car wobbles at complete stop.. engine shuts off when i accelerate from the stop
ANSWER : It sounds like you may have a severe misfire. It may be caused by many things including ignition system components, fuel system components, or even failing sensors on the motor. I suggest that you have a certified technician, like one from YourMechanic, perform some diagnostic tests to find the source of your stalling issue.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
(08 f150 4.6L) Truck is cutting off when making a complete stop at red light or stop sign.
ANSWER : Check the Idle Air Control (IAC) valve and see if its dirty or not functioning correctly. I recommend removing the IAC and cleaning it out. If the valve was sticking before, the computer could have caught it and adjusted the idle to accommodate the issue. After having the battery cable off, the computer is in a learning cycle which means that if the IAC is not working properly, the computer will have to relearn and may learn to shut off due to a faulty valve, even though the computer says its good. If you need further assistance with your engine stalling out at stops, then seek out a professional, such as one from Your Mechanic, to help you.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
My car engine shuts off while stopped or slowed down
ANSWER : This is a common sign of a failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed. This is all monitored by the idle air control valve. Your car seems to When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this may indicate a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your idle air control valve.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
Car starts but engine shuts off shortly thereafter – 2002 Chevrolet Blazer
ANSWER : Hello. No, this is not a blown fuse. Once a fuse fails, it must be replaced. I would have the problem codes read again. It is possible that you have a failing crankshaft or camshaft position sensor or another electrical component that is failing. The problem code(s) should provide some guidance for diagnosis.
If you can’t get the vehicle to another auto parts store for a "code check", I would recommend having a certified mechanic, such as one from YourMechanic, come to your location to perform an inspection to determine why the Check Engine Light is on and suggest any needed repairs.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
When accelerating after a complete stop, turning corners, coming to a complete stop or randomly when Parked a very odd vibrating
ANSWER : Hello, thank you for writing in. The vehicle may be suffering from several different issues. In this type of situation you want to start with the least complicated option, and work your way up. Start by making sure your tires are properly inflated, and have them balanced. Your brakes may be playing a role, and you will want to start by cleaning them off with some brake cleaner, and make sure nothing is stuck between the pad and the rotor. You can then raise the vehicle and manipulate the wheel looking for excess play, damaged axles and joints, and damaged wheel bearings. From there you may need to look into the wheel assembly itself and make sure there is nothing mechanically wrong, dirty, or damaged. For more help diagnosing or resolving the vibration issue, contact our service department to schedule an appointment.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
Engine wanting to shut off at complete stops or slowing down lower than 15mph
ANSWER : Hi There!
It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate and eventually stall. 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 load 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. The idle air control valve helps to control the deceleration back to an idle. 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.
It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate and eventually stall. 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 load 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. The idle air control valve helps to control the deceleration back to an idle. 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.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
Reduced engine power and car shuts off
ANSWER : Hi there. If there is carbon build up on the valves in the engine then that can cause a rough running condition and even a check engine light but that will not usually cause the vehicle to stall. It sounds like you have another issue going on here. From my experience with this vehicle most of the time this is caused by a voltage issue. Most of the time it is a loose or dirty ground connection or an issue with the ignition switch. I usually start by scanning the computer for codes to see what is coming up as that can assist in finding the issue. If the codes do not help then the electrical system would need to be diagnosed to see where the power is being lost. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the check engine light is on and why the vehicle is stalling] https://www.yourmechanic.com/services/car-is-stalling-inspection
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
Stop at stop sign, give it the gas, it want go, let up, push down agin it goes,the engine does not die.!!!!
ANSWER : What you are describing sounds like a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about 800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.
Read Full Q/A … : Engine shuts off when slowing down or at a complete stop.
