I have a 2001 chevy express 1500 v6 it wont start i check fuel pump,fuses and replaced distributor cap and rotor. havent check spark plugs or wires. it wont start...

the high humidity (water) is attacking your electrical starting system, whens the last time you changed your spark plug wires , distributor cap & rotor ? how about your fuel & air filters ? cleaned your battery terminals ? try it , it will help !!!!!!!!!

1st, check to see if the fuel pump runs for 3 seconds when you turn the key to run (not start). If it doesn't run, then check the fuel pump fuse & relay in fuse box under hood, if OK, (spray starting fluid in the intake to see if engine fires at all), if no fire then look towards the ignition as the problem. There are 5 things need to start an engine: 1. fuel (delivered & pressure), 2. air, 3. spark (distributor/ignition module or pickup coil), 4. rotation & timing, 5. compression. any of these that are wrong or not there, the engine fails.

Distributor rotor inside check that if it's a v6 then check ignition cool that connects to distributor more need replacement.

check for spark at the spark plugs, there have been a lot of trouble with the distributor caps and rotor. Be sure it has the correct AC Delco spark plugs and good wires. Be sure to use AC Delco or GM parts.

Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor

Check for spark at a plug first. If none then its either the coil or ignition module. The module is located under the coil.

Sounds like bad distributor cap or rotor. If ones bad, might as well change both. Take off the cap and if there is a black color on the ends of the prongs, or on the end of the rotor, time to replace. Is it getting fuel into motor?

also your car may need a timing belt change

More than likely it's the distributor. They have a tendency to build up corrosion and rust and have personally went through the same situation three weeks ago on a suburban. Check to see if you are getting spark from the distributor first. Have the ecm in the distributor checked at Oriellys for free. It's under the rotor and has two 8mm head bolts with wires plugged in at each end.