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Car ran fine,parked it.went back hour later,it turned over but wouldnt even try to fire.i checked all connections,nothing felt loose.about a hour later,i tried it again and it cranked up and ran fine.next day i tried to crank it up,it started and then cut off.now its acting like its not firing again.every now and then it will crank up and cut off,while still turning over.help!
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Depending on how long it sat you may have either a weak spark (which will not start the combustion) or a timing issue. The timing belt may have slack, caused by a loose tensioner.
Is is possible that you ran out of gas? I would put some gas into the car, unless you are sure you got gas. in that case I would start checking for loose ground wires.
What are you wondering is correct.
Let check the coil first. if coil is good the there is a problem with the ignition module. If the ignition module is good then a problem with the crankshaft sensor.
The coil can be checked by measure resistance of the terminals of the primary coil and secondary coil separately to see if it open.
To check if it can generate a spark, once you identify the primary coil terminal, run 12 V wire to these terminal, connect a spark plug to the secondary coil, by just leaving a spark plug with connected with spark plug wire and let it touch the engine chassis. Now you have to make pulses at the 12 volts connection by making a break and connection several time to turn it on and off to generate the spark at spark plug. The ignition module is supposed to do what you are doing now to generate the spark. If it is bad, it can't do what you did then a spark is not generated.
For the crankshaft sensor, only the shop can tell you it is bad or not. Good luck.
It sound like you are having a electrical problem.You need to check your electrical/ignition system,not all electrical problem the diagnostic machine can read.
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