P1860 code from chevy astro van 1999 - 2001 Cadillac DeVille

It is called an owners manual.

Skmet, Have you had a full tune up lately, including an injector cleaning. Problem could be a misfire, have a good Tech scan for codes, diagnose and estimate repair. Check the attached links,instruction and guides, Good luck
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1999 Chevy Astro Van Hesitation Issue
AstroSafariVans com
Astro Van hesitates when cold 1 2 EricTheCarGuy EricTheCarGuy Stay Dirty
http://www.automotiveforums.com/t546930-_96_4_3l_s_10_misfires_or_hesitates_at_constant_speed.html

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

www.topix.com > Chevrolet Astro

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 ...

chevroletforum.com > ... > Past Chevy Truck, SUV & Vans > Astro

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 ...

try the throttle posistion sensor your gonna have to get a manual to find out where its located

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.

Hi, typically, this would resemble a faulty sending unit, when the computer sets a code for this sensor, it will set your guage to empty as a result. A new sensor may correct this condition.Good luck...Coop

1999 CHEVROLET TRUCKS ASTRO VAN 4.3L 6-cyl Engine Code [W]
CAPACITIES: Automatic Transmission, 4L60-E Initial Fill..........4.7 liters
Automatic Transmission, Total Fill 4 speed 4L60-E..........10.6 liters
To check fluid level, transmission should be hot and engine running at idle. Pull the transmission dip stick out "red" wipe clean and re-insert. Check level of transmission fluid as indicated on the dip stick using the second reading and make sure the Astro is parked on leveled ground. Add Dexron III or VI as needed and do not over fill.
Thank you for using Fixya and good luck

it only one compressor and it's not hard

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You should have a 4l60E in your astro van. Which is electrically controlled, so no vacuum modulator. However, to address the ventilation selector not working... look for a vacuum line exiting the firewall and going to the passenger rear of the intake manifold. You will likely find it broken or disconnected there.

aslong as your tranny is still shifting properly then it should be fine, try getting a fluid flush and a new filter and new fluid and that should fix it up, thats what i did with my 96 astros and that cured them both