No start when it rains/security light

1998 CHEVROLET 1500
136,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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MIKE SUTHERLAND
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Truck runs and starts great when it is nice weather. When it rains or damp out it will start for one to two seconds then shuts off. Security light stays on when it does this. Light sometimes goes off and it will start. I have replaced fuel pump, ignition key and tumbler, relearned the key and tumbler, ignition coil, ignition module, rotor cap and distributor cap. Cleaned and greased all electrical connectors. If the suns comes out for two or three hours it will start. I have replaced the distributor and rotor three times. Could it be the cam or crank sensor?
Sep 9, 2018 at 10:32 AM
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STRAILER
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Hello,

It sounds like the passlock module is having a problem. I would remove it to check for water damage and to see if there is corrosion at the terminals.

PASSLOCK/Electronic Variable Orifice (EVO) Module Right Side Of Instrument Cluster, Behind Air Duct

Here is the wiring diagrams for the system so you can see how ti works. Check out the diagrams (below). Please let us know what happens. Cheers, Ken
Image (Click to enlarge)
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Sep 10, 2018 at 1:14 PM
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MIKE SUTHERLAND
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Thanks Ken. I will check this out. Thank you
Sep 10, 2018 at 2:54 PM
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STRAILER
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Please let us know.
Sep 11, 2018 at 11:23 AM
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MIKE SUTHERLAND
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Have not had time to start on it Ken. I will let you know for sure.
Sep 11, 2018 at 12:37 PM
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MIKE SUTHERLAND
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Found and air dryer module with low air pressure. Cleaned connections with electrical contact cleaner and air dryer them. Truck started. Waiting for it to rain to see if this works. No moisture or corrosion found anywhere
Sep 15, 2018 at 1:09 PM
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DANNY L
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Hello again.

Keep us updated if the symptom continues. Thanks again for using 2CarPros.
Danny-
Sep 15, 2018 at 5:40 PM
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MIKE SUTHERLAND
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Danny. Done just what you ask me to do. So far it has been starting every time. It has rained here the last three weeks an it has not failed to start. Did not see any moisture in module or on connectors but something differently work. Thank you so much for y’all helping me. You guys are great.
Oct 20, 2018 at 6:59 PM