I live in Oklahoma but try to get to Colorado a couple of times a year with my stock 1981 FJ43. My practice as been to adjust the carburetor and lean out the fuel mixture as I gain altitude. It has worked with some success (steep or moderate grades at altitude put me in the very slow lane) and I make notes of how many 1/4 turns in I make as well as the location (altitude) so that I can reverse the procedure when I return. Are there any tips or techniques I should use to ensure I don't run too lean. I read somewhere that you can advance the timing to address altitude issues? I have no idea how to do that and would probably end up in a shop in the mountains if I did.
Thanks
Thanks