I HAVE REPLACED THE FUEL PUMP, FUEL FILTER, COMPUTER, SPARK PLUGS AND WIRES, AND THE CRANK SHAFT SENSOR, BUT NOW MY CAR TURNS OVER, BUT WON'T START. I DON'T KNOW WHAT ELSE TO DO! CAN ANYONE HELP ME?
CAR WON'T START on 1991 Chevrolet Lumina
check the wiring to and from the fuel pump relay. I have a 90 lumina and it would do the same every time it rained. The wiring has a tendency to corrode and thus causing too much resistance in the circuit. Have a mechanic replace these wires if found faulty.
The first step would be to properly diagnose the no start condition of your 1991 Chevrolet Lumina. In order for the engine to start you must have proper spark at the cylinders at the correct time, fuel in the correct amount, and proper compression from the engine. Loss of spark or fuel are the most common reasons for a no start condition. You must try and determine if the ignition system is capable of producing the necessary spark. If spark is OK then begin checking the fuel system, if not diagnose the ignition system and repair it. If the fuel system checks out OK then begin checking the engine for mechanical faults, if it does not diagnose the fuel system and repair it. There are no magic answers to repair an engine that will not start and as you have already found out just replacing parts may not correct the problem.
if you are getting fuel pressure and no spark..replace the ignition module.