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Discussion Starter #1
I have a 1999 chevy S10 pickup that won't start when wet outside. Starts very well otherwise.

I replaced coil - twice and other gizmo beside coil as well as wire from coil to this gizmo - to no avail.

If I use hairdryer to dry coil area, truck will start fine!

I suspect this is a known problem with S-10s because I heard others with same issue.

What is the problem?
 

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Spray a little WD40 on each item.
One at a time, wait for rain, see what happens.
If it won't start, pick a 2nd item and spray it.
When it starts on a wet day, you found the item.

WD40 is a very short term sealant, it will disappear after a short time.

But, there are waterproofing sprays you can use after you find the problem.

EDIT:

Ed, please provide your vehicle info in the future!

I had to check, the V6 has a coil and a distributor

The I4 does not.

So, the "gizmo" your talking about is the distributor.

What did you replace, the cap?
 

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Discussion Starter #4
Hi - Thanks for your suggestions! I already tried a waterproofing spray - no luck. I'll try replacing cap and rotor. I just don't understand why blow drying the coil area (not even near distributor) would fix the problem...
 

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Well, something is shorting to ground when wet.
Take the coil off, wash it real good, dry it and reinstall.
Do the same with the coil wire to the distributor.
Don't submerge them, just wipe them clean
 

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Those dist caps don't have a seal on the bottom of them and moisture can get inside fairly easy.
 

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Maybe you have a venting problem. There should be 2 vents in the base. There may be a clogged screen in it or no vents at all like what I discovered a few years ago in my burb with all the same symptoms as you one could wet spring. I drilled 2, 1/8" holes so it could breath.

Al
 
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