I have a caprice (heavy car) and since here in El Salvador, mechanics only know Japanese cars, they hooked up the vaccum lines wrong when the carb was changed. My grandma bought a rebuilt carb about 2 years ago, a rochester monojet. Back in those days I wasn't too interested in cars so i didnt care much.
When the mechaninc installed it, he hooked up the vac. advance to a manifold vaccum and the vaccum line was clogged. I drove the car for about 2 weeks and noticed i was only getting about 8 MPG and I said wow something must be wrong. So i hooked up an unclogged vaccum line to a ported vaccum and capped off all of the manifold vaccums which were uncapped. I also changed the vac. adv. in the distributor. I did all of this thanks to the advice of my fellow inliners.
Now, after changing the oil, checking the timimg, and hooking up the carb correctly, I get 12 MPG which I consider to be low, but i get more power now. I believe the tranny is ok, haven't checked the muffler to see if it is clogged, but what do you think could be causing this? All of my driving is city driving since there are no highways in El Salvador. I keep my foot off the gas for as much as i can and the car according to a site should have 2.73 rear gears. Do you think maybe the carb was jetted for a truck or something and that could be causing the low gas mileage? How can I check the jets without having to take the carb apart?
