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My 98 dak for the past two weeks will not start on damp or rainy days. I thought is might have been moisture under the cap, but it wasn't. The cap and rotor needed to be changes so that is brand new. I thought it might have been the coil and that checked out. Once everything dries out the truck fires right up. This morning the truck did start with it raining but starting running rough and died when I got out of my drive way and would not restart. I was able to get the truck started tonight with is wet out but it took a lot of cranking. This was while I had my scan tool on live data to see if I could see anything. I really stumped as to what it could be. Any in put would be great.
 

· Gen I FTW
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just curious why you didn't do plugs/wires as well ?
 

· Gen I FTW
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maybe one of the plug wires melted a bit ?
 

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what did you check on the coil?? did you replace it?? it may have a crack or something.
 

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I ohmed out the coil both the primary and secondary. Both were in acceptable limits according to my service manual.
it still may have a crack or something and it wont show up when you check it with the ohm meter. i might be wrong, but im just trying to give you some ideas...
 

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Another idea is to get a spray bottle of water and squirt at different things with the engine running. Do the coil (it could be cracked/arcing), plug wires, etc as well as the engine wiring harness and wiring connectors. Also, check all the ground connections. Strange as it sounds, they can ground fine dry but not wet sometimes if there's a bit of corrosion. Keep spraying item by item until (hopefully) the engine sputters or quits. As I said, just some more ideas..........
 
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· Gen I FTW
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4,528 Posts
Another idea is to get a spray bottle of water and squirt at different things with the engine running. Do the coil (it could be cracked/arcing), plug wires, etc as well as the engine wiring harness and wiring connectors. Also, check all the ground connections. Strange as it sounds, they can ground fine dry but not wet sometimes if there's a bit of corrosion. Keep spraying item by item until (hopefully) the engine sputters or quits. As I said, just some more ideas..........
that's what i've done before to reveal a bad coil.
 

· Crown on the Rocks
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do the water spray. Mine was the coil. Also pop the hood when it's dark and your truck is running. Leave all lights off and see if you have and arcing. My old 92 did this when I first got it. Wires were toast.
 
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