White smoke, won’t start, 1999 Jeep Cherokee

It won't start but cranks and there's There's white smoke coming out the intake what can cause that
Experienced mechanics share their insights in answering this question :
Hi there, thanks for writing in about your 1999 Jeep Cherokee. You need to check to see if your engine has spark to the spark plugs. This could also be due to a bad crankshaft sensor. The smoke coming out of intake may be from excess fuel getting into the engine without ignition. Scan and monitor data to see if crank sensor is sending signals to the computer to give the engine spark to run. If you would like to have this looked at, a certified technician from YourMechanic can come to your car’s location to inspect the starting issue and assist with any needed repairs.

How to Identify and Fix Common car Problems ?

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This can be caused by faulty wire casings, heated residues on the engine block and overheated liquids including oil, transmission fluid and brake fluid. There may also be a fault in your coolant system, or your engine may not have enough lubricant. No matter the problem, you should find a trusted garage to take a look.
The most common reasons a Jeep Cherokee won`t start are a dead battery, an alternator problem, or failed starter. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
Coolant leak: Excessive white smoke coming out from your exhaust on startup suggests that coolant has leaked from the cooling system into the combustion chamber and mixed in with the engine oil. As the combination of coolant and engine oil burns, it consistently creates thick smoke.
White smoke usually means coolant is getting into the combustion chambers of your vehicle. This generally happens because of a cracked or leaking head gasket, which allows coolant to seep into your cylinders. In extreme cases, you will need to replace your head gasket.
White Smoke

It usually means that coolant is being burned in the engine, which means that something is drastically wrong. The most common cause of this is a blown head gasket, which can quickly lead to an overheating engine.

But white smoke usually is caused by vaporized coolant, which often is the result of a blown head gasket. At the middle of the engine, you have the cylinders, which combust gasoline and air. All around those cylinders are passages for coolant, to keep the cylinders from overheating.
The most common causes for a Jeep failing to start despite its radio and lights working are issues relating to its battery or other cranking/start-up components, such as the ignition switch, starter, or spark plug. These pieces might be damaged, dirty, or corroded.
A Faulty Fuel Injector

Without getting too technical, the injectors that deliver the fuel to the combustion chamber can leak or become stuck in the open position. This means too much fuel in the engine that needs to burn off and be expelled. This is seen as gray or white smoke from the exhaust.

No. The only thing that can cause white smoke is if there is water getting into your combustion chamber. And that can only be caused by a blown head gasket.
Vehicles often produce thin white smoke caused by water vapor and condensation in the exhaust pipe. However, if it`s not condensation, white exhaust smoke is typically caused by an engine coolant leak. This could mean a coolant leakage — going from the coolant system into the combustion chamber.
White or Gray Smoke from Exhaust – Just like if you see white smoke from under the hood, persistent white smoke usually indicates a coolant leak. If there`s only a little bit, it`s probably condensation. Blue Smoke from Exhaust – If you see blue or dark gray smoke, that`s an indication of burning oil.
The most common answer to, “Why is my car smoking but not overheating?” is that there`s a type of fluid that`s landed on the engine. This can be motor oil, fuel, transmission fluid, coolant, or even condensation. It can cause your engine to smoke because it`s burning off that fluid from the engine.
A cold vehicle emits white, gray or black smoke when first started due to condensation, but not after the vehicle is warmed up. When a vehicle is started, water is emitted in the form of a vapor. By the time the vapor hits the exhaust system it condenses, and becomes visible.
Other reasons for the smoke to be this colour could be a very dirty oil or air filter. However, most of the time the issue is just a problem with the engine (could be internal or external). While white smoke may just come from your engine on a cool day, excessive white smoke most likely indicates a problem.
Many starters conduct high levels of current as they operate, and issues with wiring or other electrical components may cause smoke and overheating. Oily starters are often trouble as well.
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. It can be hard to determine if you`re dealing with a battery or an alternator problem.
This usually means the battery is bad and incapable of handling a huge request for power to crank the engine over. Headlights begin white and bright, when you try to start the engine, they dim to nothing or almost nothing then as soon as you let go of the key, the headlights QUICKLY bounce back to white and bright.
One common culprit for this problem is the crankshaft position sensor, which measures the position and speed of the crankshaft. The computer uses the information from this sensor to know when to fire the spark plugs. If the sensor isn`t working, the spark plugs won`t fire, keeping the engine from starting.
Here are three indicators of a bad EGR Cooler: White Smoke – while that pesky Valve can cause an abundance of black smoke billowing from the pipes, a failing EGR Cooler actually emits white smoke, or steam, caused by evaporating coolant inside the cooler. When you see white smoke, call for help.
If your spark plug is white in color or appears blistered, that means something is making the plug run too hot. Check for problems in your engine`s cooling, a lean fuel mixture or incorrect ignition timing.
NOTE: When an engine has been burning oil, the spark plug(s) will accumulate burned oil residue around the electrode area, which can harm the engine`s performance. Clean or replace the spark plug(s) once the cause has been addressed and the engine stops producing white smoke.
White or light gray smoke is usually associated with paper, straw, leaves, or wood.
White smoke is a result of unburned fuel particles passing through your car`s combustion chamber and out of the exhaust pipe. As previously mentioned, white smoke is related to lower temperatures in the combustion chamber.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Vehicle won’t start, once it’s jump started it only stays running until you turn it off, then it work start again without jumping.
ANSWER : Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not have enough juice to start it again. Inspect your battery – it should have at least 12.5 to 13 volts to start your car, if it doesn’t you will need to replace the battery. The second problem could be that your alternator is bad and not charging your battery, in this case you will need to replace your alternator. Both the battery and the alternator can be tested in your car. If you would like to have the car checked for you, a certified professional from YourMechanic can come to your car’s location to diagnose the starting problem and proceed with repairs.

White smoke, won’t start, 1999 Jeep Cherokee
ANSWER : Hi there, thanks for writing in about your 1999 Jeep Cherokee. You need to check to see if your engine has spark to the spark plugs. This could also be due to a bad crankshaft sensor. The smoke coming out of intake may be from excess fuel getting into the engine without ignition. Scan and monitor data to see if crank sensor is sending signals to the computer to give the engine spark to run. If you would like to have this looked at, a certified technician from YourMechanic can come to your car’s location to inspect the starting issue and assist with any needed repairs.

Fuel pump engages. Batery good, alternator good volts, jump start helps when wont start. Temp does not matter. Intermittent?
ANSWER : Hello. Thank you for writing in. There are several reasons your vehicle may only start when jump starting. The first and most common is a build up of resistance that is causing you to need a boost of voltage to get the engine started. This may be due to poor battery cables, a bad ground connection, a poor starter solenoid, and a couple of other issues. The first thing you want to do is perform a visual inspection of the starting system. Make sure there is no corrosion build up in the battery cables. You can also check the resistance across these wires and make sure you have a solid connection between components. You then want to make sure the starter solenoid is doing its job. It is responsible for taking the small amount of electricity sent by the ignition and turning it into a huge electrical charge that is strong enough to push over the engine with the help of some gear ratios in its favor. Do some more testing, and stick to the basics before assuming its something seriously complicated.

2000 Jeep Cherokee overheated and won’t start
ANSWER : Hi there. If the vehicle overheated, and you noticed a lot of coolant on the ground, it’s quite possible that either the radiator broke, a coolant hose broke or the radiator cap was damaged. When this happens, a lot of coolant spills on your hot motor (which is the odor you are smelling). This can also cause damage to critical electrical parts that help the engine start and run. It’s probably a good idea to have a professional mechanic come to your location and complete a car is hard to start inspection, so they can determine what is damaged and needs to be repaired to resolve your problems. Without knowing what is damaged, it’s hard to provide an estimate for repairs.

My car won’t start, neither does my auto. Start. Sometime it might start if I jump it sometimes it won’t.
ANSWER : Hi there. There are a number of issues that will make a car hard to start. Everything from the electrical system to the fuel system to the actual starter itself can be the problem. Finding the root cause of a hard starting engine can take some investigation. Ignoring a hard starting issue can further damage the vehicle, which will often result in a more expensive repair. You might want to have a mobile mechanic complete a car is hard to start inspection so they can pinpoint the source of the issues you’re having and recommend the right repairs be completed.

The car crank but won’t start
ANSWER : Hi there. This does sound like an issue with the wiring. If the check engine light is coming on every now and then this means that when it does not come on there is no power to the computer. This can be the wiring harness issue or an ignition switch problem. I would have to test for voltage to the computer when the problem is occurring to be able to find where the issue lies. If you need assistance, a certified YourMechanic technician can be dispatched to your location to inspect your vehicle’s non-start issue and suggest any necessary repairs.

Hello, i had my head gasket repaired and after 8 months it has started making white smoke come from exhaust again and I can smell
ANSWER : Hello, thank you for writing in. With white smoke coming from the exhaust, the smell of coolant, and the (very likely although unmentioned) lowering of the coolant level, it is quite apparent that the coolant is making its way passed the head gasket and into the combustion chambers. Unless you have a cracked head, engine, or other serious damage, the head gasket is very likely the issue. Make sure you are adding coolant to compensate for the loss. Low coolant levels will not give you accurate temperature readings on your dashboard, as the sensor is located at the top and needs to be submerged in liquid to give you an accurate reading. As far as repairing the issue, replace the gasket again, and in the process inspect the old gasket for signs of failure or indications on what caused the leak the second time. If replacing the head gasket again does not solve the problem, you know you have a larger issue with the engine and can take further diagnostics from there. For more help from our technicians, contact our service department to schedule an appointment.

Car won’t start. When trying to start, starter makes a clicking noise and then closed back hatch recloses.
ANSWER : It sounds like there is some type of drain on the battery. When there is low voltage in a battery, it can cause several symptoms. The electrical systems can act very strangely when they don’t have the correct voltage being supplied. When a battery won’t hold a charge, it can be caused by a wiring issue, a bad battery, or some type of parasitic draw that can slowly pull voltage from the battery. Some electrical diagnosis done by a professional, such as one from YourMechanic, will be necessary to pinpoint the cause.