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Old November 30th, 2010, 12:25 PM   #1
camoII
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Default 92 gmc 5.7

Whenever it rains or is damp weather my truck misses and runs like garbage. Does this happen to anyone else? I've looked at the distributor cap and its dry, all the plug wires are dry. Don't get it. Any ideas would help thanks.
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Old November 30th, 2010, 12:28 PM   #2
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u may have a small crack in the dis cap or the seal on the bottom is bad i buy a new cap and see if that solves the prob
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Old November 30th, 2010, 12:44 PM   #3
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Cause: when the dist is hot water is getting on the cap and causeing tiny cracks.

Look where your dist is, the back of the engine just under the hood gap, what is happening is that you have a crack in the cap and you are getting a little moisture in there. There are a few fixes that I have found to work great on many models where the dist is located there.

1. Spray the cap and wires when new with w-d 40 or silicone, this can also help as a incase of emergency fix ( I carried a second cap in the truck just in case). Not everyone will agree but I found it to work on an old dodge when I got stranded

2. (This is a little rough for purest to handle) 89-93 Ford Mustangs had a dist cover from the factory, after replacing your cap for a new one put the cover on it, usually you can find theses at swap meets or ebay really cheap as everyone just get rid of them. After I put the dist cover on I never had the problem again.
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Old November 30th, 2010, 01:02 PM   #4
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I looked at the cap and didn't see any cracks but I'll look closer. I also tried the wd-40 trick and it made no difference. Thanks for the tips. I'll take another look.
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Old November 30th, 2010, 01:11 PM   #5
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Quote:
Originally Posted by camoII View Post
I looked at the cap and didn't see any cracks but I'll look closer. I also tried the wd-40 trick and it made no difference. Thanks for the tips. I'll take another look.
I always thought I would see the cracks but never did, just go get a new cap, the wd-40 trick didnt always work, I learned that there was a power loss I could feel start happening and if cought early engouh it would get me to where I needed and back till I got the new cap. I always carried an extra cap and rotor with me once I figured out the cause even after I put the cover on..... I need a new cover as i just got a truck that may someday have the same problem again.
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Old November 30th, 2010, 01:15 PM   #6
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Ok cool. It's been doing this for a while and I figured I couldn't be the only one it was happening to. Thanks again.
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Old November 30th, 2010, 01:32 PM   #7
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Use an old spray bottle with some water in it. Lightly spray the cap and wires and listen for a misfire and look for little electricity arcs. You will NOT be able to see any of the cracks in those items, but you will sure see the resulting light show if there are any....
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