Vehicle dies upon stopping.

ANSWER : From what you describe it is the front wheel bearings in the front hubs that need replaced. You should also check the tires for uneven wear and need for tire rotation or alignment issues causing uneven tire wear.

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.

ANSWER : Hello – your symptoms suggest that once your cold start features are no longer needed – engine warming up – there is an air "leak" that ruins low speed running. Causes could be a leaking exhaust gas recirculation (EGR) valve, or leak in the air intake. A failing fuel pump relay (burned contacts) could cause similar behavior, contacts become hot, then won’t pass enough current to run the pump. Failing pump can also act this way – gets hot and fails. I recommend a starts, then dies inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : My apologies but this scenario would be much easier to understand if you were to indicate the direction of travel for each vehicle such as N, S, W, or E. Also, the outcome of this scenario is likely to be different depending on the state or town you live in. I would recommend calling your non-emergency police number, doing some online research, or even visiting city hall to find answers to questions about the law in your municipality.

ANSWER : Hello. We will be happy to assist you. The issue your S500 has is likely related to an electrical sensor, such as a cam position sensor or crank position sensor. After several years in use the sensors can be subject to heat which may cause an open circuit. After the sensor is cooled it will usually start working again which is why you are able to restart your vehicle at times. I suggest you have a technician test your cam position sensor and crank position sensor because they are the mostpropable causes causes for the vehicle stalling. You are able to choose a technician who can perform such diagnosis and arrange an appointment here https://www.yourmechanic.com/services/car-is-stalling-inspection

ANSWER : From what you describe it would appear that your vehicle is experiencing stalling. Stalling can be caused by many things. A few common causes for engine stalling are a bad idle air control valve, issues with the fuel system, or issues with the ignition system.

The idle air control valve is the component responsible for maintaining engine idle speed when the engine is not under load. If it has any issues, leaks, or fails, it may cause a rough idle or even stalling, If any of the components of the fuel or ignition systems, such as the fuel pump, fuel pressure regulator, ignition coil, or ignition module, fail or have an issue, they can also cause misfires and stalling. I would start my making sure that there are no vacuum leaks present, and then move on to checking the idle air control valve.

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.

ANSWER : You’ll have to go through a stalling diagnostic but the good news is the symptoms you are describing are fairly dramatic and so the cause is likely to be readily found. Common causes of engine stalling include a faulty mass airflow sensor, faulty engine coolant temperature switch/sensor (typically at cold start only), worn spark plugs, wires or defective ignition coil(s), inadequate fuel delivery or pressure (clogged fuel filter, injectors), contaminated or old gasoline, defective throttle position sensor, faulty idle air control valve, leaks in the EGR system, intake vacuum leaks, and so forth. If you request an engine stalling/rough idle diagnostic the responding certified mechanic will get this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi and thank you for contacting YourMechanic. First thing to do is get the new battery checked and new alternator checked. In my years as a mechanic, there has been multiple times when I have installed a new out-of-the-box item and it was bad – so this is possible!

If the battery and alternator check good, then you are probably going to have battery ground issue or an grounded circuit in your vehicle that is draining your battery. Electrical issues are very hard to troubleshoot and pinpoint through messages, but these are some basic starting points. These problems are a process of elimination to solve.

If you would like to get a precise diagnosis, a certified professional from YourMechanic can come to your car’s location to inspect the starting problem in person so that you can move forward with repairs.