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Re: sometimes the engine doesn't start and the spark...
Change cap & plug wires. If emergency before wire & cap repalcement, spray wires & cap with WD-40, let sit a few minutes & try it. WD-40 displaces moisture. Don't keep doing that though, its dangerous, just replace wires & cap.
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I have the same problem on the same car. I replaced the spark plugs, wires, distributor cap and when it's damp and wet my car would not start. sometimes if i try for 20 minutes it may kick in but doing so after a few rainy days i blew my starter. Now I just spray my wires and cap with the wire dryer and WD40 before it rains. And if it doesn't start and it's wet outside, use the wire dryer. I heard some people used some shroud to cover their cap, but i don't know what they used as it's close to the engine and I didn't want something melting.
Wet weather start problems can usually be traced to the spark shorting to ground before making it to the spark plug.This can sometimes be fixed by using a water proofing silicone spray available at your local auto store but I suggest you replace the plugs ,wires,cap,and rotor (if so equipped on this model and year) and then spraying with the silicone.The spark is shorting to ground somewhere so you may as well do it all if you haven't replaced them for a while.Good luck
Check Battery, all battery connections, the ground from motor to frame and from battery to motor and or body. A poor ground connection can cause all kinds of problems. Also i had a car that would not start in high humidity that turnedout to be the starter. It was pulling too much juice from the battery at high humidity.
without testing anything its really a guess. But I would get the fuel pressure checked to start with. Also try starting the car with your foot on the gas slightly. if it starts better then the Idle air control valve may be at fault
9 of ten times that's caused by bad ignition wires, cap, rotor or sometimes even the ignition coil. Dampness makes it easier for spark to bridge a gap and jump to ground when wires are porous or there are carbon tracks on the other components. If the spark escapes before it gets to the plugs, the engine will not start.
Check for moisture in the Distributor and use a blow dryer to dry it out. You may want to consider changing your Spark Plug wires to a "Moisture Resistant" type. Please let me know if this helps you and thank you for using FixYa!