I have changed the spark plugs, fuel filter, fuel pump and charged battery. Still not starting?

Is the starter cranking the engine over as fast as it should be? This guide can help us find the problem

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

There could be several reasons why your 1991 Chevy Caprice is not starting, even after replacing the spark plugs, fuel filter, fuel pump, and charging the battery. Here are a few possibilities you could consider:

Ignition System: Check the ignition coil, distributor cap, and rotor for any signs of damage or wear. A faulty ignition component could prevent the spark plugs from firing properly.

Fuel Delivery: Although you replaced the fuel filter and fuel pump, there may still be an issue with fuel delivery. Check the fuel lines for any clogs or leaks, and ensure that fuel is reaching the engine.

Ignition Timing: Incorrect ignition timing can cause starting issues. If the timing is off, the spark plugs may not fire at the right time. Consider having the ignition timing checked and adjusted if necessary.

Engine Sensors: Faulty engine sensors, such as the crankshaft position sensor or the camshaft position sensor, can prevent the engine from starting. These sensors provide important information for proper fuel and ignition timing.

Electrical Connections: Make sure all the electrical connections related to the ignition system and fuel system are secure. Loose or corroded connections can disrupt the flow of electricity or fuel.

Starter Motor: A faulty starter motor can prevent the engine from cranking. Listen for any clicking sounds when you turn the key to start the car. If you hear a click but the engine doesn't turn over, it could indicate a problem with the starter motor.

Please check out this guide it will help you fix the problem.

https://www.2carpros.com/articles/car-not-running-advanced

Please go over this guide and get back to us.

What do you mean, "Has a device you can use to start the car with"? Does the engine turn over, but not start? Or when you turn the key, does nothing happen? And finally, are the rest of your electrical accessories working?

I'll need to know this information before I can attempt to help you. To try without it, I would have to cover waaay too many areas.

Dunno what you did here-but verify valve and ignition timing put engine no.1 piston on its compression/TDC line the markings at the crank pulley TDC-open up the dist. Cap and look if the rotor is pointing to the no.1 cap tower. If not its out of time.

Dose it attempt to fire? Need to determine if fuel or ignition. Next time it happens spray some carb cleaner in throttle body. If it fires then fuel system
Also check for spark pull plug wire see if it arcs to block. Let me know and will advise.

So is it now starting in the rain?

More likely the loose air intake if air gets to throttle body without going past temp sensor and vortex the fuel will not be richened for cool damp conditions.

Let do below for a start to determine if its fuel or spark related issue and get back asap.

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it