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Could be connected, but could also be two different problems.
It could be something in the key switch, or a wiring problem. Or it could be a wiring problem with the temp gauge and something else causing the engine not to start.
Do you have spark and fuel pressure at the injectors ? And does the gas gauge work ?
Does the starter spin the motor at normal cranking speed? If there seems too much friction, try turning the engine over by hand to check if the engine turns freely. Put a socket and wrench on the center crankshaft pulley bolt and turn clockwise. If you cannot turn the crankshaft with a wrench easily, then the starter can't either. Turn the crank all the way around to check for something preventing cranking.
Is the battery still enough power to crank at normal speed? If it's already too low, recharge it, and try again.
seems like flooding you remove spark plugs. see them soaked with fuel. flooding. does car restart easy? never stated. if you lose spark , the ECU cuts fueling, but not 100% of time. so spark tests are first. also make sure the EGR is not stuck open. when the car starts to stall. can the fast right foot , prevent it? if yes, is it easy to do.or is it fighting you hard. or not possible. now you have some ways and means.
quick easy check is to pull the plugs. the clean one would be where the problem exists. usually the head gasket gives out first to prevent damage to the head. on occasion the head becomes damaged. if all plugs are the same then the problem is in the heater system. check all hoses and see if you can smell coolant or see any wet spots. the no start situation could be lack of compression. or try taking 1 plug out and watch for any spark. this has to be done in the dark or you could miss the spark. the spark pack is next if no spark then test by swapping with a known good one.
Just a thought. How low was the tank when you filled up. I know alot of sediment builds up and have heard of similar problems. So I have made a habbit not to go below 1/4 tank to prevent from clogging the fuel system. That is what I would check. It sound like you have a good hold on the mechanical aspect. Verify your fuel inlet screen at the tank or the filter is not clogged. Only other thing I can reccomend after that is have a reputable shop do a systematic pressure check on the lines starting from the fuel source. Good luck.
Sounds like it could be the crank sensor. This sensor relays engine crankshaft position to the computer so it knows which spark plug to fire when as well as other info. Another common problem with a Jeep is the throttle position sensor. This usually doesn't prevent the vehicle from starting but its not impossible either.
I'm not familiar w/ the elantra, but I'm wondering if u forgot to attach a connection to a safety switch that prevents it from starting unless the clutch is depressed. Seems it should be something that simple since it was ok before. countrycurt0