What would cause a Jeep Cherokee to not start?

The most common causes that hinders normal starting operation of your Grand Cherokee are dead key fob battery, dead 12v battery, corrosion on battery terminals, bad alternator, clogged fuel filter, broken starter, blown fuse, empty gas tank, immobilizer error or any fault in the electrical system.

Why is my Jeep turning over but not starting?

The usual suspects, that can cause this type of problem, are a bad fuel pump, bad crank sensor, bad ignition coil (if your Jeep is distributor equipped), etc. This is usually due to a bad starter motor, bad ignition switch, bad neutral safety switch, or the engine is locked up.

What controls spark and fuel?

The (PCM)’s functions include; positioning the crankshaft and controlling the ignition spark and timing. So, if there are problems with how the (PCM) performs these functions, the vehicle may not run.

Can spark plugs cause no start?

The ignition coils and spark plugs are what actually cause the ignition in your engine. Fuel and air is injected into the ignition chamber and your spark plugs cause the spark that makes them ignite, starting your car. If your spark plugs are degraded or malfunction completely, your car can fail to start.

What do I do if my Jeep Cherokee won’t start?

How is a no-start diagnosis fixed? Correcting most no-start problems usually involves replacing the alternator, starter or battery, cleaning connections, ignition system repairs, or fuel system repairs.

What do you do when your Jeep won’t start?

If the starter works but your jeep is still not running, you’ll need to test the alternator. You will need to bring your vehicle to an auto parts dealer for an alternator test. Fortunately, if the problem is the alternator, you will probably be able to jump-start the jeep and get enough power to start it once.

What would cause no spark from coil?

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.

Why is my engine turning over but not starting?

When your engine cranks but won’t start or run, it could mean your engine is having trouble producing a spark, getting fuel, or creating compression. The most common causes are problems in the ignition (for example, a bad ignition coil) or fuel system (for example, a clogged fuel filter).

What are signs of your starter going out?

What are common bad starter symptoms?

• Something sounds off.
• You’ve got lights but no action.
• Your engine won’t crank.
• Smoke is coming from your car.
• Oil has soaked the starter.
• Look under the hood.
• Tap the starter.
• Adjust the transmission.

Why would my car suddenly not start?

A dead battery is the most common reason why a car won’t start. If you have a battery tester, check your battery to see if it’s weak. If you don’t have one, try jumping your car with jumper cables. Battery corrosion.

Why does my Jeep have a no start condition?

If there is spark being fed to all cylinders, then you can eliminate the ignition system as the cause of the no start condition and can move on to other tests (like testing fuel pressure). Remember, the idea behind checking for spark is to see if all of the engine cylinders are getting spark. Here are the most common results from a spark test:

Why does my Jeep stall when I start the engine?

If it starts, the fuel pump is the problem. If not, the engine should be checked for spark. It could be a sensor or computer-related problem. To be absolutely sure, raise and support the back of the Jeep on jack stands, unless the height allows you to crawl under the back without raising it.

Why does my Jeep 4.0L have no spark?

It’s almost impossible for all 6 COP ignition coils to fail at the exact same time… so the most likely cause for this no spark condition is a bad crankshaft position sensor. But before you go out and replace the crank sensor, you need to test it (to make sure it’s fried).

Can a spark test be done on a no start Jeep?

Testing for spark can very easily and safely be done with a dedicated spark tester. If the ignition system is the cause of the cranks but does not start condition, you’re not gonna’ see spark at any of the 6 spark plug wires or 6 COP ignition coils.

What are common reasons my Jeep Cherokee won’t start?

What are common reasons my Jeep Cherokee won’t start? While there are a variety of reasons your Jeep Cherokee won’t start, the most common 3 are a dead battery, an alternator problem, or failed starter. How is a no-start diagnosis fixed?

What kind of ignition system does a Jeep Cherokee use?

The ignition system is the one tasked with creating and delivering spark to each of the 6 cylinders. Without spark, the engine will crank but no start. The ignition system of the Jeep vehicles covered by this tutorial use either a distributor type system or a COP (Coil-On-Plug) ignition coil system. Failed ignition coil.

Why does my car not start when I crank the engine?

If the engine doesn’t crank, or makes an unusual noise when cranking, you may have a starting system problem. The car’s security system may have made an error that disabled the fuel or ignition system, or the chip in the key may have failed.

Why is the Check Engine light not coming on?

Even if the check engine light hasn’t come on, you may find a pending code that can guide you in your diagnosis. False input or lack of input from sensors like the crankshaft position sensor (CKP) or camshaft position sensor (CPS) can prevent the engine from starting.