Jeep is ruining find. shut the engine off and sometime it wont turn over at all (No sound for the starter at all) . batter is good, I have discounted the battery when I reconnect it starts with no problem and will work find for awhile. And then it starts all over. Is the the ECU going bad or something Else?
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Your starter solenoid armature is sticking. It is mounted atop the starter and the heat from the exhaust manifold sometimes causes this problem on older systems. You can try a temporary fix by placing some type of heat shield over the solenoid using something that is fire proof but replacing the solenoid will eventually be necessary.
Ok. You didn't say what size engine was in the Jeep, but based on your problem, I'd bet its the 2.5L 4 cylinder. They had a classic issue with intermittent failure of the crankshaft sensor. This will cause the vehicle to just shut down without any other indications, Sometimes it will restart immediately, sometimes it can take minutes to hours to restart. The sensor is easy to replace and not very expensive. It is located on the drivers side of the transmission bell housing.
Won't start sometimes is not much to go on, but... does it crank but not run or does it not turn over? If it won't crank (turn the engine) then the problem is in the starting circuit (starter, starter selenoid, battery, battery connections (especially the ground) or starter switch [or the wiring and or circuit protection devices and their connections].
If it turns over, but won't run (sometimes) then the problem is most likely either that it isn't getting spark or it isn't getting fuel. There are so many different possibilities here that I am hesitant to begin even listing them. Does it run well once it is started?
If it runs well after it is started that would likely rule out some mechanical issues like compression/head-gasket etc.
If you post more details about the symptoms, you will probably get more useful information back.
Install a new crank shaft sensor. I had the same problem with my wife's Jeep. It would run fine fore days at a time then quit. When the crank sensor goes out their is no spark or injection of fuel into the engine. This is a Hall Sensor. They can be intermittent, and affected bu heat. If your Jeep will not start, try freeing the sensor and see if it starts. Cold Freeze is used in electronics to test
Probably a starter. It sounds like the starter solenoid is working, but the starter motor is not energizing.
You could try this simple trick, but Im about 85% sure you have a bad starter.
Have a buddy help you push the vehicle in neutral for a short distance. When you get it moving at a walking pace, put the transmission in Drive, and let the vehicle come to a stop. You may hear a little clicking, but thats OK, it wont hurt anything. Put the transmission back in Park and try to start the engine again. Sometimes the starter gear gets stuck on the flywheel and it wont engage when you try to start the engine. This trick may move the flywheel a little so the starter can engage.
It sounds like a bad starter solenoid/starter, because a starter sits so close to a engine and exhaust that over the years the heat starts breaking down the components and when you drive your Jeep the starter solenoid gets "heat soaked" so when you've been driving your Jeep around for awhile and then turn it off the solenoid is "heat soaked", it needs to cool off before it will engage the starter again. Sometimes it can take up to a few hours to work again. Some people hit the starter w(the engine off) with a hammer to try to free it up.
The solution is to replace the starter with a new one and your Jeep will start up every time. Most starters come with a new solenoid already attached so it's best to replace them both.
It sounds like you may have a bad connection somewhere. Start with your battery cables and then look at all of your ground wires as well. When you try to start your jeep see if the wires from the battery get hot.
are you saying that the starter wont turn over the engine? or does the engine stall soon after starting? ill need more info to get a better idea of whats going on. im a certified jeep/chrysler/dodge tech and can probably give you a good educated guess
It sure sounds like a starter solenoid issue, they act just like that, had exactly the same concern on my car, no crank just clicks under hood, new starter solenoid contacts cured the problem. I don't know if your solenoid is rebuild-able or not, I think it is a Japanese starter so most likely it is.