Wet weather better for me....

Penguin

I have found a strange problem. My jeep runs great when it is heavy mositure out. Heavy dew. Misty rain. But cannot get a good run when it is dry out. Crusing down the highway fighting to get to 70-72. Starts to mist and the jeep shoots up to 75+ with lots of power. Get a little farther up the road and it starts to get dry, engine starts to run like crap again. The other morning it was heavy dew in the air, jeep ran the best I have ever seen. I know it has to be a fuel mixture but I don't know what. I have tried several different tweaks on the carb but I am like a blind squrriel looking for a nut. It is a 83 258 with the carter carb. I have tried different carbs but still had the same problem. The carb was rebuilt to specs. But I will not rule out anything at this point. Could this be because I polished the heads to well??? I am grasping for straws here. :-|

tufcj

Cool, wet air is more dense, so when weather is bad, you're getting more air (oxygen) into the engine. Your intake could possibly be starving it, or you could be WAY rich on your mixture, and the dense air is giving it enough to burn efficiently. It's really hard to tell without an exhaust analyzer. Maybe get an old Edelbrock water injection system? Bob tufcj

Penguin

tufcj wrote
Cool, wet air is more dense, so when weather is bad, you're getting more air (oxygen) into the engine. Your intake could possibly be starving it, or you could be WAY rich on your mixture, and the dense air is giving it enough to burn efficiently.

It's really hard to tell without an exhaust analyzer.

Maybe get an old Edelbrock water injection system?

Bob
tufcj

:t:
I thought about putting a water spray system in if I couldn't figure out what could be wrong.
However your discription of the air/fuel mixture would make sence( I didn't know what was the mix of air/fuel).
Now I have something more to work from. My exhaust pipe is really quite black on the inside. I have been trying to get the right mix from the srews but it looks like I need to move to the lean/rich mixture on the choke side.
I dropped back to 1 1/2 rich so maybe I should drop a few more. I was running better with the move but maybe I didn't move it enough.
I might also try a different air cleaner for a while.