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Troubleshooting a stalling engine is often problematic because it can be caused by so many different factors. An experienced mechanic should be able to narrow down the possible culprits, but even then, diagnosing the stall can be challenging. The problem may be hiding in the fuel system; it might be lurking in the ignition system; or it could be related to an assortment of components outside these systems.

Below, we'll describe some of the most common reasons an engine will stall. A lot depends on the circumstances surrounding the event, which we'll mention throughout when the information is relevant. For most people, troubleshooting a stalling vehicle requires too much time and effort to do themselves. If you're willing to try, however, the following information will provide a useful guide.

Problem In The Ignition System

Your car's ignition system is responsible for igniting the air-fuel mixture in your cylinders. It is composed of the spark plugs, plug wires, distributor, distributor cap, and ignition coil. Voltage travels through these components with the spark plugs at the end of the line.

Several problems can occur within this system. For example, the ignition timing may be faulty; the coil might be failing; the plugs may be fouled; or, the ignition switch might be malfunctioning. Each of these parts should be tested to ensure they are functioning properly.

Inadequate Fuel Pressure

Often, engines stall because they receive too little fuel to keep them running. This can usually be traced to a problem involving the pressure, which may be attributable to one of many components in the fuel system. For example, a lot of drivers will cold-start their vehicles in the morning only to see them stall immediately, or soon after. Here, the issue can be a failed fuel pump, a blown fuse that controls the pump, or even a clogged injector. If the pump is the reason, you're unlikely to be able to start your car again.

Faulty Powertrain Control Module

Your powertrain control module (PCM) - essentially a computer chip - influences several functions that affect the performance of your engine. For instance, it controls the fuel injectors, ignition timing, and emission controls. The PCM receives amperage from a relay that is susceptible to failing. If the relay fails, the PCM will stop working, which in turn means the fuel injectors will stop working. Sometimes, the computer itself will fail. In both cases, your engine will stall.

Bad Battery Or Loose Connections

Most car batteries will last up to four or five years, after which they begin to lose their ability to hold a charge. When this happens, the alternator is forced to keep the depleted battery recharged while you're driving. The problem here is that the extra workload forced upon the alternator may cause your idling speed to drop. If it declines low enough, your car will stall.

Failing Sensors

There are two main sensors that send data back to your powertrain control module: the oxygen and coolant sensors. The oxygen sensor may fail due to a heavy accumulation of dirt. This prevents it from sending data to the PCM, which uses the information to manage the amount of fuel that reaches the engine.

The coolant sensor's job is to keep the PCM informed regarding the engine's operating temperature. The computer uses this information to adjust that amount of fuel that reaches the cylinders. If this sensor malfunctions, it may send faulty data to the PCM. This can cause the computer to make poor judgments regarding the air-fuel mixture in the chambers. In some cases, your engine will stall.

Compression Leak

Over time, engines can develop leaks that affect the level of compression within the combustion chambers. This usually occurs when certain components, such as the piston rings or valves, wear down. If the compression leak is severe enough, your car may stall while idling.

Troubleshooting engine stalls can be frustrating, especially when they occur sporadically. Unless you have experience working on your vehicle, you may be better served by letting a trained mechanic diagnose the underlying problem.

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Discover the Amazing Benefits of Cold Air Intakes

Your relationship with your car is a lot like your relationship with your girlfriend. When you first get her, she is flawless. I’m talking perfect -- spotless paintjob, shinning chrome, totally clean under the hood, nice tight brakes. But after a few months of breaking her in, you start to realize every little flaw. Where did that dent come from? The engine never used to make that sound, did it? Slamming the gas doesn’t give you the same thrill that it used to. Well here is your solution.

Three words – Cold. Air. Intake. Cold air intakes provide amazing benefits for you and your vehicle. A cold air intake may be just what the doctor ordered to rekindle you and your car’s passion.

What is a cold air intake? A cold air intake is a system used to lower the temperature of the air going into a car for the purpose of increasing the power of the internal-combustion engine. A secondary goal is to increase the appeal of a car by altering the appearance of a car's engine bay and consequently creating an attractive engine noise.

The cold air intake replaces your car’s stock air filter with a cylindrical tube that has cone-shaped filter on the end of it. The long, cylindrical extension tube strategically positions the filter in a cooler part of the engine bay, allowing for the engine to draw in cooler air than a normal filter.

The purpose of the intake is to collect a colder air charge than inside the engine compartment, allowing the fuel management system to give the engine a denser air/fuel charge into the combustion chamber. To clarify: Cold Air = More Horsepower. The warm air from your engine compartment is good for fuel economy, but because it has less oxygen molecules than a cold air charge, the fuel will be leaned out. This increases your fuel efficiency, but decreases your horsepower.

Next time a ricer Civic pulls up next to you at the stop light, you can look over and laugh with confidence. Simply tap your gas and listen to that beautiful intake breathe. His fart-can muffler will pale in comparison to your car’s throaty growl.

Cold air intakes are also extremely easy to install. If you have two hands and a screwdriver you can install it yourself. Most kits come with directions, which you will only need as a rough guideline. You basically need to pop out your old air box and pop on your new cold air intake.

But how on Earth will I know which CAI (cold air intake) to get for my car? Well my friend, you are in luck. They recently came out with this crazy invention called the internet. You can research, shop and buy one, all from the comfort of your home. A lot of automotive sites, or at least the good ones, have a vehicle selector features. All you have to do is pick out which year, make, and model you have and the site will return all the intakes that will fit.

K&N is probably the most popular brand, but companies like AEM, AFE, Volant, and Injen also make quality products. The K&N FIPK (fuel injection performance kit) offers gains of up to 26 horsepower. In addition to the added power, the intake will add a nice growl as you accelerate, but isn’t too loud.

About the Author

The K&N FIPK and other cold Air Intakes may be the best option for some cars, while short ram intakes may work better for others. Get online and start researching what will work best for your vehicle. –Mike Rosania

How to control air temperature entering fuel injector?

From an engineering project point of view, can we control the temperature of air entering fuel injector? i would like to have your suggestion if its possible by some radiator or some coolant? Thanks

Just to be correct with the terms ... air doesn't enter the fuel injectors (but I know what your saying). Air will travel first through your air box that houses your filter. Then it goes through the pipe into your throttle body. From there it goes to into your intake manifold and from there it goes into your head. There are gaskets that you can get that are supposed to cut down on the heat transferring from the motor to your intake manifold. There are "cold air intakes" that bring in outside air, instead of the heated air that's under the hood.

If your car has a turbo / supercharger you can run a line of CO2 and have it spray on your intercooler and that will lower your intake temp a bit. But remember you don't want the air too cold because it does have to combust.

That's about all the ways to cool the air off that technology currently allows. Hopefully that'll give you some ideas.

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