I was sitting in the car for a few hours listening to the radio and turning the car on and off several times during that time. when i went to leave the battery was dead. got a jump and drove home, about 20 minutes, but the car is once again dead?

If battery keep dying in few hours then check if there is something drawing battery while car is of. It could be something easy like broken switch on door which leaves lights on to faulty computer which doesn't turn off . Sometimes those things are almost impossible to find and chaperone is to disconnect battery when leaving car overnight. Just make sure there is not electrical short somewhere which may cause car fire. Also is good idea to park car in quiet place, tur it off and listen for anything running, like radiator fan, ac blower etc.

check your fuel pressure to make sure it is coming up to spec. if not, then replace the fuel pressure regulator. there are some sensors that come into play during the starting cycle and warm-up cycle that do not get read by the computer at operating temperature. you will have to see which ones in your vehicle monitor during the ignition phase to see if any of these are failing.

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next time you have it sitting turn your key to on and listen for your fuel pump. if you hear a whir and click its working if not? go there 1st. the only other thing it might be that you could test I can think of is the catalytic converter. there is a test plug and if you pull that and its starts BINGO! good luck.

alot of times when you let a car sit for a while, the oil will slowly drain down into the oil pan. When you start the engine, the knocking you hear is all the metal parts flying around, waiting for the oil pump to start spraying the oil everywhere. If you start it back up, let it run for a minute and listen for the noise to quieten down, it should eventually go away. You can help prevent the dry start as you are having by using good synthetic oil, and sometimes adding in LUCAS oil treatment.

Check fuel pressure at the injector rail. If good, suspect crankshaft position sensor--when it fails to start, check for sparks by pulling an ignition wire off the coils and holding it close to the coil with an insulated tool while someone cranks the engine. If no sparks, replace the sensor.

I had a similar issue where the alarm went off, pulled the battery to silence, and upon re-connecting it the Jeep wouldn't start. It's a protection mechanism built into the security system to prevent tampering/bypassing the system. The computer goes into lockdown and won't start...

To clear it you have to reconnect the battery and leave it sit. It's supposed to be a 60min cycle, but it seemed like it took longer for me. I plugged it in before leaving for work (in my wife's vehicle) and she tried starting it several hours later when she needed to run an errand and it started right up.

put a battery charger on the battery,turn key to on postion[engine not running] turn radio to on and let it sit there like that for about 5 hours or untill radio say code then enter right code. if battery goes dead during this you have to dtart over

if the car just wine's when starting like it would normally and nothng is happening...Check for fuel, either find the fuel pressure relief valve near the rear of the engine, and depress the valve stem (fuel should hit the roof of hood) if not then its a fuel problem, try this a couple times, but turning the key over, and listen for noise from the gas t ank to see if the pump is actuating.. if you hear the noise while just turn the keyy to acc, not start plz comment back that you hear it , but its still doesnt start....
hope this fix's-ya!

There is a major short somewhere,the hum you hear in the speaker
is the frequency of the DC electricity flowing through the speaker coils,do all four speakers hum or just one?Do you have a stock or aftermarket stereo?

Turn off the car and remove the negative battery cable off. let sit a few minutes then reconnect the cable. try it several times. The removal of the battery causes the computer to deprogram itself. what you will be doing is re-programming the computer module.