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Engine needs to crank over strong and steady to have a chance of starting. Youi said it has a poor crank. Battery may be low or bad. If you get the engine to crank over corrrectly and it srill does not start check fuel pressure, spark and injector pulse.
Chev Cavalier has had problems with the crank position sensor, mounted on the bell housing, where it picks up the crank position. Check it with a meter to see if it is OK, else the fuel injection system could be clogged (fuel filter is the main culprit).
sounds like the crank position sensor. check continuity and 5volts reference at sensor. you can have it checked by someone with a Good scanner(SNAP-ON). If it happens to start up,drive the car till it wont start up again; unplug the crank position sensor and count to 5 then plug it back in. If it starts then its the crank sensor.(just a quick way to test it and get you home or to a shop)
check the throttle position sensor,it may be stuck and it wont start unless its all the way back.Almost like trying to start it with the gas pedal down-which it will crank and crank but it wont start.
ck the crank position sensor. It's on the front of ehgine at the crank pully. If there seems to be a fuel problem, ck the maf sensor. first sensor out of air cleaner. good luck
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