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2002 Mercury Villager Question: Engine misfires when weather is humid.

 

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john3165, 3.3L V6, Lakeland, FL, November 07, 2010, 14:16
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The engine misfires in rain or just when is very humid. Runs great when dry. Changed the plug wires, roter and dist cap and still have same problem.

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  • Answer #1

    DaveJHM November 07, 2010, 16:47
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     Master

    Make sure the wires you purchased are high quality or even better yet - original equipment wires. I still think you may be experiencing some arcing from the wires. The key thought here is the moisture content in the air when the problem occurs.

    To confirm, get a spray bottle with water and while the engine runs, spray around the plug wires. See if the car stumbles.

    Beyond that, you could have an injector or harness issue.

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