won't start when it rains

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Old 11-25-08, 11:05 AM
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won't start when it rains

I have a 1992 Honda civic wth 18,000 original miles. When it rains out the vehicle won't start. I took out the back seat to check to see if the fuel pump runs when the ignition switch is on. It does when it's dry outside but it does not when its damp outside. I was told to replace the fuel pump and the pump relay which I did, but the problem still exists.
 
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Old 11-25-08, 12:14 PM
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SOunds more like an ignition problem to me. Moisture = no spark. Check the spark plugs to see if there is spark when it doesn't start.
 
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Old 11-25-08, 12:20 PM
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Have you noticed any water droplets that form on electrical components under the hood? Like at a coil or distributor? If it rains and it is dark out, see if sparks are jumping, under the hood, when you try to crank it at night.

If you have a distributor, maybe that when you run the car and shut if off, and if it rains, it condenses under the cap. That has occured with certain cars even with foggy weather.
 
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Old 11-25-08, 01:36 PM
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Originally Posted by ecman51` View Post
Have you noticed any water droplets that form on electrical components under the hood? Like at a coil or distributor? If it rains and it is dark out, see if sparks are jumping, under the hood, when you try to crank it at night.

If you have a distributor, maybe that when you run the car and shut if off, and if it rains, it condenses under the cap. That has occured with certain cars even with foggy weather.
It isn't an ignition problem, I mentioned that the fuel pump doesn't energize when the key is turned on. It works when things are dry outside (weather). This has been going on for some time now. It's the fuel pump circuitry for sure.
 
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Old 11-25-08, 03:10 PM
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Originally Posted by thunderbolt5 View Post
It isn't an ignition problem, I mentioned that the fuel pump doesn't energize when the key is turned on. It works when things are dry outside (weather). This has been going on for some time now. It's the fuel pump circuitry for sure.
1. it is easy to set your mind on something and keep chasing a ghost, missing another culprits. 1st thing that comes to mind, give 92 vehicle and wet issue is leaking distributor cap - either cracked, or loose, or seal is worn out. try celeaning it with moisture removing spray on a wet day - see what happens.
2. but, say, you are 100% POSITIVE it is fuel pump. find wiring diagram for your car (library) and trace all wires/fusible links/relays/fuses along the route. you might be surprised.
bottom line is - somewhere, moisture accumulates to the point of preventing start up. like i said - sounds awfully like distributor cap.

btw - is it a carb model? cuz you could pour some gas into the intake on a wet day, and if it fires right away - it IS pump, and if not - well.....
 
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