Since the forum has linked both the s 10 and the blazer together and suggests posting here for better results, I' repost my s-10 problem here. I have a 88 s10 with 92000 miles. It is a very basic pickup with no frills. It has 2.5 and a distributor and EFI. I live in Utah, a very dry state with very dry air.
The day after it rains, it wont start. I don't even have to drive it the day it rains. If fact, it only has to be a moist night with a lot of dew and cool temps. and I can't start it the next morning. I about run the battery down trying. Usually after 10 minutes of trying I get a few puts from the engine and then after a few more tries, it will start. I have had to pull it a few times to get it started because it just wouldn't start. Once running, it runs great and will start right up every time there after until it sits all night and it is a moist cool night. If it is parked in the garage, it starts every time. Too bad the garage doesn't hold all the vehicles!
What I mean by won't start is the engine turns over just fine but the cylinders won't fire.
I checked the firing of one of the spark plugs and it has no spark or very weak spark at best. I'm thinking that moister is getting into the distributor some how. The oil looks good so I don't think it is coming from the crank case.
Any one shed some light on this problem?