The car continously switches off in the morning, basically it has a cold start but once on the road it is fine

My car continuously switches off in the morning but once it is on the road and the engine heated a little it is fine. We took it to the mechanic and he says that he cannot understand why the cold start. Once on a long stretch their is absolutely no problem with the vehicle.

My car has 282000 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
Hello. Issues during cold start can be caused by many things. A few common causes are issues with the engine management or fuel system. Virtually all engines are designed to run with an increased amount of fuel during cold starts, to help the engine start and warm up when it is cold, and to run differently when up to temperature or under heavy loads. The computer uses the fuel and engine management systems to make these calculations, and if there is an issue with either of these systems, perhaps in the form of a faulty sensor they may throw off the computer’s calculations and cause performance issues. I would start by looking at the vehicle’s fuel and engine temperature sensors, as these are two of the main engine management sensors that function based on temperature. If you would like a precise diagnosis, have a certified professional, like one from YourMechanic, pinpoint the cause of the cold starting problem so that this can be repaired appropriately.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Fouled Plugs: Spark plugs create the spark which allows the vehicle to burn fuel. Fouled plugs are one of the most common reasons for a hard starting engine. As electrodes wear down, the voltage required to jump the gap to ignite the fuel increases. This can lead to prolonged cranking before the engine will start.
The most common reasons a Toyota Corolla 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.
Most commonly, its caused by a fuel pump that`s not working. The fuel pump fuse may have blown, or the fuel pump itself will need to be replaced. Alternatively, this problem could be caused by a leak in the fuel lines, clogged fuel injectors or a bad fuel pressure regulator.
Common reasons for this to happen:

Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine.

Hard start symptoms and starter failure may NOT be caused by the starter, but could actually be caused by the crankshaft position sensor. If your vehicle is experiencing one or more of these symptoms, the crankshaft sensor may be at fault.
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.
It could be a dead alternator, a bad coolant sensor or lack of fuel, just to name a few. Is your car stalling while accelerating? If so, then it could be a major vacuum leak, clogged fuel filter or a bad fuel pump. If your vehicle is stalling when driving, seek professional help to track down and fix the issue.
A difficult start could be due to a number of things, from a dying battery to a faulty starter. But if your vehicle has a hard time starting after sitting for just a few hours, it can cause an extra layer of confusion. When this happens, one of the most common causes is low fuel pressure.
If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
If the vehicle randomly shuts off while driving or stationary, there is usually an issue with the engine. Typical patterns here are issues with the ignition system, mixture preparation or fuel. A known error here is that the vehicle was refueled with the wrong type of fuel.
Common reasons for this to happen:

Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine.

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.
The most likely causes of this are a clogged fuel filter, spark plugs, coil, failed fuel injectors, wiring harness fault, vacuum leak, MAF sensor, or oxygen sensors.
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.
A: Possible causes: a marginal battery, a poor connection in the starting circuit or starter, a charging-system problem, or the battery is being drained while the car`s parked. If this only happens first thing in the morning, a weak battery or a drain in the electrical system are likely causes.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The car continously switches off in the morning, basically it has a cold start but once on the road it is fine
ANSWER : Hello. Issues during cold start can be caused by many things. A few common causes are issues with the engine management or fuel system. Virtually all engines are designed to run with an increased amount of fuel during cold starts, to help the engine start and warm up when it is cold, and to run differently when up to temperature or under heavy loads. The computer uses the fuel and engine management systems to make these calculations, and if there is an issue with either of these systems, perhaps in the form of a faulty sensor they may throw off the computer’s calculations and cause performance issues. I would start by looking at the vehicle’s fuel and engine temperature sensors, as these are two of the main engine management sensors that function based on temperature. If you would like a precise diagnosis, have a certified professional, like one from YourMechanic, pinpoint the cause of the cold starting problem so that this can be repaired appropriately.

My car isn’t starting, it’s really cold out. I was wondering how can I start it with this cold weather
ANSWER : Hi there. Given the description of not being able to start your vehicle, when it is cold and jump starting the vehicle without any problem. This leads me to believe the battery does not have enough cold cranking amp capacity. The engine needs to turn over fast enough to start. This may be nothing more than a weak battery. I recommend having this confirmed by a certified technician from YourMechanic.

My car stutter starts, but only after driving it for a few minutes.
ANSWER : Hey there. This may also be caused by what is called the fuel pressure regulator. This is a unit that helps to maintain the fuel pressure at the proper level. When this is not working properly, the fuel pump may be pumping properly, but the fuel may not arrive at the fuel injectors at the proper psi. When this happens, this can cause a lean fuel condition which may cause the car to hesitate, misfire, or stall. If you would like to have an expert pinpoint the issue, a certified professional from YourMechanic can come to your car’s location to inspect the hard start problem and confirm which repairs are needed.

Map sensor car won’t start up good ?
ANSWER : Your MAP sensor is an important input for your computer. It helps determine the load on the engine to calculate the correct amount of fuel to inject. It sometimes takes a few seconds for the vehicle to realize that the sensor is not producing a good signal.

At that point, it will use other methods to determine the fuel rate, such as pre-programmed fuel maps, throttle position, etc. I would suggest replacing the MAP sensor and retesting. If you would like to have it checked first, a certified technician from YourMechanic will be able to scan your vehicle and test components to determine the root cause of your starting issue before making a repair.

Car starts on cold mornings, then shuts off while driving
ANSWER : It sounds like you’ve been addressing a number of issues. Of the parts that you have had replaced, only the crankshaft sensor would be one that would be likely to cause your car to shut off while driving. You could be having a failure in an ignition module or a fuel pump relay or even contaminated fuel. But I don’t recommend you run out and have those parts changed. What you need is a careful diagnosis so that you don’t waste money on expensive parts that don’t need to be changed. If you contact Your Mechanic, they can send a qualified mechanic to your home or office to check out your shutting off problem and tell you just what can be done about it.

My car is Renault megane 2003 model manual, my problem is the car stooped it self in the road light & it cant start now.
ANSWER : Hello and thanks for contacting YourMechanic. There are 3 things that could cause the symptoms that you are currently experiencing. One is the ignition coils getting too hot and failing.

The second is the trigger to the ignition coils could be cutting out. The camshaft and crankshaft sensors are what control the trigger to the ignition coils. If one of the sensors are not responding correctly, then the trigger may get dropped by the computer. The computer would shut down the engine to prevent any problems.

The third problem that could effect this issue is a faulty neutral safety switch on the clutch. Check the harness and wires to the switch on the clutch and see if they are clean and free from corrosion. Make sure that the switch is not binding up or sticking. I recommend replacing the neutral safety switch, then retesting. If the system continues, then replace the crankshaft and camshaft sensors. If the symptoms are still present, then the computer is locking the trigger out and shutting off the engine. Then you would need to flash or replace the computer. If you would like to have an expert scope this out in person, a qualified professional from YourMechanic can diagnose the stalling issue and let you know exactly what needs repair.

My car wouldn’t start after being parked in the cold for a few days
ANSWER : It’s clear that your battery is dead. If you want to try charging it, you need to put it on a slow charge for 12 hours or more, but I suspect even then it won’t do the job. It was probably marginal for a while and then a few nights in the deep cold were enough to finish it off. When you get the battery changed, you will want to have the charging system tested to be sure that it is OK, but since you can run after a jump, I expect you’ll find that it is all right. Be sure you have a good battery in the car before you test the charging system. If you don’t you might get a false reading. As for jump starting the car. I strongly advise against having anyone besides a professional do that. I have just finished fielding some questions for people who have done a lot of damage to their cars by hooking up the jumper cables backwards, even for a moment. The car’s electronics are very sensitive to the voltage surges that come with jump starting a car. To conveniently have your battery replaced, you can contact Your Mechanic, they can send a technician to your home or office to replace your battery and see what else might need attention.