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Won't start if it rains

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Old 12-15-2011, 06:48 PM   #1
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Default Won't start if it rains

I have a 1992 F150 with a 300-6 with 220K miles. A couple months ago, the computer smoked. I replaced it with a reman from Advance Auto Parts, and it started right up,,,,,,,,,,,, for a couple days. Now, every time it rains, the truck won't start. I tried using starting fluid, to see if it was a fuel issue, but it won't hit on that. I used dielectric grease on the connection, and put a little silicone around the cover around the computer, but it still won't start if it rains. Give it a few days to dry out, and it fires right up.

Any ideas????????
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Old 12-15-2011, 06:50 PM   #2
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Is your starter solenoid on the passenger side fender behind the battery getting wet?
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Old 12-15-2011, 07:04 PM   #3
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Just off the top of my head I'm thinking 2 or 3 possibilities...

-Distributor cap condensation? Possibly the gasket is worn allowing moisture in?
-Loose connection on the firewall or fenders allowing the rain running down it to short out?
-If none of the above, I recommend a move to somewhere it never rains?

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Old 12-15-2011, 07:15 PM   #4
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Quote:
Originally Posted by Preston121068 View Post
-If none of the above, I recommend a move to somewhere it never rains?
Nobody is supposed to know about my secret bunker city!
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Old 12-15-2011, 07:28 PM   #5
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I seem to remember somebody else having a problem with this. Have you searched the forums at all?
Explain a little more... If you go to the store and it rains as you are driving there, shut off the truck to go inside and then come out, will it start then? Or only after its been sitting for awhile, say it rains over night and try and start it in the morning...
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Old 12-15-2011, 07:59 PM   #6
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May want to take a look at the hood cowl seal for starters.
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Old 12-15-2011, 08:44 PM   #7
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I sprayed wire dryer on the cap and wires, but it didn't help. I also sprayed it on all electrical connections under the hood. Nothing.

The cowl seal is in great shape, but falls short of where the main plug and the computer plug is, so water flows down across them both. I applied a heavy dose of electric grease to both plugs on a dry day when is was running good. Rained today,,, won't start.

The truck isn't driven on the road now, but is used on the farm alot. On a dry day, it runs great. If I get up and it has rained overnight, it won't start. The cap and wires only have about 15K miles on them.

It just seems strange that this problem started when I changed the computer. Never had a problem before that. The computer is under warranty, so I thought I might get it exchanged out to see if the problem is in it. I could see when I changed it, that the metal tray it slides in had rust on it, so I know it was wet at one time or other. I expect if the computer was getting wet, it would fry when I tried to start it.
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Old 12-15-2011, 09:16 PM   #8
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I agree with starter solenoid try that my buddy had exact same problem with his 95 and I remember when i was a kid my dad had the same problem with his country squire wagon.
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Old 12-15-2011, 09:29 PM   #9
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Just tried the wire dryer, and starting fluid, and got it started. Missing really bad. Will try to pick up a new set of wires and cap/rotor tomorrow. Hoping that is all it is. Will let ya know.
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Old 12-15-2011, 11:41 PM   #10
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Default if you change those wires use your warranty.

if you got them at a big chain auto parts store, most have a lifetime warranty on them. ive took back more than a couple sets and got new ones for free. done it with struts on my wifes car too.
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