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In my experience, if your vehicle is running roughly after a rain, the problem most likely lies with moisture getting into your distributor cap. This is the cap that all of your spark plug wires run into (either 4,6, or 8, depending on how many cylinders your vehicle has). You didn't mention the age of your vehicle, but it would be unusual to see this on a newer vehicle. When the motor is good and dry, remove the distributor cap and ensure that it is totally dry and the motor is running fine. Once you've done this, replace the cap and spray the exterior of the cap liberally with a silicone spray sealant. Make sure and cover all of the top and sides. This should provide a watertight seal and prevent any moisture from entering the cap. Hope this helps.

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17y ago
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7y ago

Ignition wires are bad. Try this, once you have it running again take an old spray bottle and mix up a solution of salt and water then spray the wires with this solution at night with the hood open and engine running. Doing this in the dark will show you how bad the wires really are by giving off quite a light show. Good spark plug wires won't do this.

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16y ago

Does it not crank at all? Do you have power? Check battery terminals, check wiring to the starter.

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16y ago

Spark plug wires could have become porous try spraying with silicone or replacing

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7y ago

The most common cause of wet/damp starting problems is moisture inside the distributor cap. Remove the cap and look for signs of moisture or better yet just replace the cap and rotor.

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Q: Why would a car not run very well after a heavy rain?
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