Jeep will turn over and try to start but shoots back pressure out of the intake
My jeep prior to replacing the crank shaft sensor. Now it will turn over and get very close to starting but doesn't, and is pushing back pressure out of the intake. The timing chain has been replaced, I can't figure out what's wrong.
My car has 130000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. If it is shooting pressure back through the intake then either the valve timing is off or the crank sensor is not reading correctly. I would typically start by checking the compression. If the compression is off on all cylinders then the cam timing is incorrect. If it is low on only one or two cylinders then you may have a bad valve seat on those cylinders. If the compression is fine then the ignition timing appears to be off. This can be caused by a defective crank sensor, a wiring issue or a computer problem. I would also make sure that all of the ignition coils are installed correctly with the correct routing. From my experience with this vehicle it sounds like a valve seat problem. If you want to have this no start checked out, consider YourMechanic, as a certified mechanic can come to your home or office to [diagnose why it is sending pressure through the intake] https://www.yourmechanic.com/services/car-is-not-starting-inspection
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
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.
The Engine Turns Over but Won`t Start:
If this is happening, take a look at the fuel lines running to your engine. If that all looks good, there`s a chance your spark plugs aren`t receiving the spark. There`s also a chance that your vehicle`s security system is malfunctioning.
Common reasons for this to happen:
An issue with the mass airflow sensor may manifest itself when a car starts and then stalls soon after starting. Fuel Pump Relay: The fuel pump relay functions much like a fuse for an electric fuel pump. The fuel pump relay engages as the vehicle is started and starts the fuel pump.
Typically, a vehicle will start and then quit because of an issue with the fuel or electrical system. It is important to monitor fuel levels as well as warning lights which can signal to the driver that a vehicle may quit unexpectedly.
Failing Battery or Starter Motor
If a battery is low on energy, or if the connections are loose, your engine may be able to crank, but it may not start–or it may take several tries. Similarly, a starter motor that`s beginning to fail may still crank the engine, but won`t be powerful enough for it to start.
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.
The most common reasons a Jeep Cherokee won`t start is because of a bad battery, corroded battery terminals, or a bad starter. Other common reasons a Jeep Cherokee won`t start are a bad alternator and a broken or failing fuel pump.
The first is to check the wiring from the battery to the starter. They should be looking at voltage drop across the starter circuit. They should also be looking at the starter and neutral safety switch. The second issue may be the key fob is weak.
The first is to check the wiring from the battery to the starter. They should be looking at voltage drop across the starter circuit. They should also be looking at the starter and neutral safety switch. The second issue may be the key fob is weak.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Car won’t turn over. No lights come on when I turn it. Can’t even lock my doorsvor push the seat up or back.
ANSWER : Your probably correct, it sounds as though your battery is done. But it also sounds like you have charging system issues. I’m not sure that fixing your battery and charging system will solve the problem with the car shutting off, but it’s possible that it will and it’s a darned good place to start. By contacting Your Mechanic, you can have a technician come to your home or office to check out your car and help you figure out what to do next.
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.
Jeep will turn over and try to start but shoots back pressure out of the intake
ANSWER : Hi there. If it is shooting pressure back through the intake then either the valve timing is off or the crank sensor is not reading correctly. I would typically start by checking the compression. If the compression is off on all cylinders then the cam timing is incorrect. If it is low on only one or two cylinders then you may have a bad valve seat on those cylinders. If the compression is fine then the ignition timing appears to be off. This can be caused by a defective crank sensor, a wiring issue or a computer problem. I would also make sure that all of the ignition coils are installed correctly with the correct routing. From my experience with this vehicle it sounds like a valve seat problem. If you want to have this no start checked out, consider YourMechanic, as a certified mechanic can come to your home or office to [diagnose why it is sending pressure through the intake] https://www.yourmechanic.com/services/car-is-not-starting-inspection
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.
Car was sometimes not starting, not even cranking when i turned the key then after a few times itd start. Now it ont start at all
ANSWER : Hi there:
Without being there to inspect your vehicle, or having information about what type of car, truck or SUV you own, it’s very hard for us to give you some advice. You might want to have a professional mobile mechanic complete a car is hard to start inspection; so they can come to your location and determine why your vehicle is having these issues.
Car turns off
ANSWER : The problem sounds like your alternator has stopped charging the car. This will cause the car to have weak electronics like what you are experiencing. Have the charging system double checked, and if verified as the fault, replace the bad alternator.
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.
Cranks over start than dies
ANSWER : Hi There,
The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.
The idle air control valve is a small valve on the engine’s intake system that reads the air intake as it comes into the motor. This is controlled by the car’s ECM which uses this information to make adjustments to the air/fuel ratio depending on various inputs such as outside air temperature, intake air temperature, load and various other things. As you accelerate, your car’s engine is receiving a much higher dose of fuel than when at idle and conversely, when you let off the gas pedal, there is a sudden change in this fuel supply as a result of your foot letting off the pedal. When this happens, the job of the idle air control valve is to bring this deceleration down to a slow and smooth idle rather than suddenly cutting off the fuel supply causing the motor to die. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly. I would recommend having a professional come to your location to diagnose and inspect your vehicle.
