The jeep is making a loud popping sound similar to a backfire but more like popcorn popping just really loud. I'm not able to drive it as it doesn't want to go...have to give it lots of fuel in order to make it go. I've changed the spark plugs, checked transmission fluids, oil levels and all other tune up type systems. Looking for suggestions on what it could be and what to check next...
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the overheating could be causing the backfires as the engine gets too hot over heating can be due to thermostat being stuck in closed position. cooler fan not running, or blockage of air getting through the radiator. not enough coolant water in the system, or some other blockage in the cooling system. also using the wrong fuel such as race fuels can cause engines to overheat and or not run smoothly. I hope this helps.
Start with the basics...meaning check the spark plug wires and spark plugs. While under the hood, inspect all hoses for a vacuum leak(s). Then turn the ignition key on-off-on-off- on...leave in the on position and write down the number of flashes the check engine light indicates....2 flashes = #2....pause.....3 flashes = #3.
Let start from here. Are you able to perform engine repairs or diagnostics???
Your a thinker and off to a good start. How about going to TDC on crank,pull dist cap and look where you rotor is. Thinking timing chain here. Put a timing light on it just to get some practice and see where the timing is. Also rock the crank back and forth with a long ratchet or tool of choice while watching the rotor. May need help,your looking for timing chain play,think it jumped about 3 to 4 teeth. Let me know because this advice is sort of a helpful quess
how long has this been happing..one tank of fuel or more, could have been bad gas, replace filter,, put gas dryier in fuel tank..if it continues could possibly be transmission related..the reving down doesn't sound like transmission though if tansmission was slipping it would rev up..good luck