Weber Carb and \'high\' altitude
This is about my Weber 32/36 set up. Here in Northern VA, my Weber is running great (at worst idles a little rough w/ occasional stall for the first 5 minutes when really cold out). When the engine is warm, I'm 100% w/ a perfect idle.
I went up to West Virginia's Snow Shoe mountain this weekend. In the morning up there, I couldn't get a good idle. Anything under 1000-1100 RPM and she would start to go rough and stall. Even after at operating temperature, with a solid 2 hours of traveling, she still wouldn't idle at all. So I had to 3-foot-it down the mountain (staying on the gas, keeping it always over 1100 RPM). I stopped maybe twice on the trip. When I made it home, I got off the gas, and she idled fine! No symptoms a day later either. Typical story of course!
I think I was running rich up there, but its not THAT high up. Plus, after 2 hours of coming DOWN it still did it. I didn't have the time to mess w/ the mixture screws to check for change.
My current guess is that I'm running rich HERE and being up in SLIGHTLY thinner air may have 'pushed it over the limit'. Not the most scientific guess. Only other factors would be: about 10 degrees colder there and maybe a bit more humid.
Any ideas guys?
'88 YJ, 4.2L, 32/36 Weber, Jacobs Ign.