Won`t start after siting in damp weather for a day or two

Usually wet wires are issue when cold damp weather, so I would start there.

Good luck, FREE-PPV

Astro won't start or very hard to start when damp or rain ...

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Aug 24, 2007 - Posted in the Chevrolet Astro Forum. Leave a ... 2000 astro, Hardstarting or wont start when wet, once started its fine. I replaced the cap, rotor, gas filter, next rain was hard to start but did after about 10 tries. ... I have a 2000 astrocargo van. 4.3 v6. ... look for a faulty coil. mine passed out in a rainy day.

Van won't start in wet weather - Chevrolet Forum - Chevy ...

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Sep 22, 2007 - I have a 1999 Astro Van and nearly everytime it rains or sometimes when I wash it, it will not start. ... I really like my ASTRO for everything from carrying family, boat, trailer, etc. but if it is not resolved its going before someone gets hurt. ...When it was damp out, the coil case would become wet, and the ...

You need to get some wire dry spray and spray all your wires and the ignition cap etc. You may have some bad wires or you cap has a crack.
Try the spray first see if it starts and runs.

Had the same issue with our 1999 chevy astro van, would crank but would not start. It had been raining and windshield had a leak, after 2 days of no rain it started. Pulled codes and was the Security system in the ignition switch. Hope this helps.

if it only does this in damp weather, its more likely its in the ignition system. if it has a distributor check the cap for moisture and cracks. if it does have a cap. spray wd-40 inside cap to displace the moisture. WD stands for water displacement. when its dry outside and engine running. get a spray bottle and fill it with water, spray the dist. cap and wires. if there is a problem the car will chug and almost stall out. if this happens, thats the problem. have a good day !!

sounds like a short. i would check and see if there is any breaks in the defroster lines in the glass. maybe you have a bad connection

replace the plug wires.They are the old carbon type fitted, and are a common fault in the damp weather

i would replace plug wires

perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.

I would change all of it. Spark plug wires will leak under the high voltage w/o any outward signs. Unlikly fuel pump . Not effected by damp weather. If after all that and it still doesn't work, change the coil.