Sounds a lot like a failing battery. The starter's pulling enough power that you aren't getting spark. You could try using jumper cables from a car battery, see if you get spark when cranking. Be careful! It's way easy to short stuff out with those jumpers.
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Check for spark on a plug wire when it won't start. If no spark until it cools down, the ignition system is the problem. Could be the coil, the ignition control module (igniter), a crank sensor or pick-up coil, depending on your system, ...some of the most common things to check. If it just stalls, likely lost spark or gas to the engine cylinders. With a new pump, it probably lost spark.
not value cover gasket leak out around spark plug not to inside piston. but cut right off how hot? no water in oil? or filled up piston? maybe head crack. fuel pump pumping? crack line not went eng hot. ture key on look or someone look 10lb of pressure comeing out fast.water no. antifreeze yes.
the flat battery shouldnt cause the problem and you said it has spark at the plug, so that sort of eliminates electrical problems. if the carb is clean and it has good fuel, its a bit tricky to diagnose. perhaps a sheared flywheel key, blocked fuel line( it might have a tiny filter in the tank on the ends of the fuel tap pick up tubes) or short in the kill switch may let it spark sometimes)
You have three choices. First, check the spark and coil system to ensure you are getting a spark. Pull off a plug wire from the coil pack and crank. Have someone watch to see sparks snapping off the coil pack. If you don't have any replace the control module under the coil packs.
Second, you may not be getting enough fuel pressure. Put a gauge on the fuel pressure test port. You may have a bad oil pressure sensor, located down above the oil filter. Check that oil pressure sender and make sure the connector is pushed in. The power to the fuel pump runs through the oil sender. If the engine starts and oil pressure doesn't come up quickly, the computer will shut off the fuel pump. Check this and you can also manually engage the fuel pump from the relay block down by the passenger feet.
Third choice, and it's a long shot, check the harmonic balancer and the crank position sensor. If the sensor is bad, the computer has no idea when to fire the spark plugs. A magnet is on the harmonic balancer and flys by a sensor to induce a voltage in the coil and tell the computer what position the crank is in.
these jeeps are famous for the crank sensor going when the car wont run check the injector circuit it will show no voltage if you change the crank sensor make sure you hold it in when you tighten the bolt if you start the engine and start getting misfire codes loosen the crank sensor push it in just a little bit more you only have a few thousands of an inch it makes a difference . new sensors have a cardboard circle glued on them to prevent you from pushing it in so it hits the flywheel i had an issue where it had to be pushed in twice to run right auto parts store 38.00 dealer wanted 170.00 i bought the 38.00 one hope this helps
You can choose between 3 types the normal the cold and the hot (performance) sparkplugs. The normal for medium temperatures is the best, the cold is suited for bellow 5º C temps. And the hot is for hot weather and performance usage.