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Help with tuning issues

734 Views 1 Reply 2 Participants Last post by  rednecks70
Hello everyone, wel here is my dillemma I bought my 71 malibu with a fresh motor, however I have had to hook the transmission vacuum line and the distributor advance line to it. The car was way advanced when I got it so I set it to 8 degrees, it seemed to run smoother at low rpm so I went one step forwar and changed my plugs gapping them to 45 as directed by the parts store or ac delco, this is where it sarted getting worse, I am getting 13 inches of vacuum steady which is saying intake leakage or vacuum leak, neither of these seem to be happening it seems like an ignition problem, it runs smooth at low rpms and when I accelerate a little further it misses but then catches itself, my next step is to change wires. Also I noticed today when I looked inside my carb the the jet was only shooting on one side, but it looke like it was in the middle of the carb, it is a holley 600 cfm electric choke 4 barrel part #80457. Anyway here is where I am also the car had a bit of an rumble and supposedly it has a mild cam but I dont know because the car runs pretty bad. Any help would be appreciated. I am new to carbureted cars and looking to learn and make my car run optimum. Thanks
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Since nobody replied I will give it a shot...When you retarded the initial timing did you add more centrifugal (sp?) advance? Because if you didn't then your total timing is probably to low. Also, even if you have a mild performance cam it will probably run better with more initial advance than 8 degress, I would bump it to 14 or 16 and see how it reacts (plug the dist. vacuum canister when setting your timing). Remember to check your plugs for signs of detonation. Once you have the timing fixed I would move onto the carb, you should definitly see gas coming out of both sides of the squirter which by the way is not a jet, your jets are screwed into the metering block, you would have to remove the bowls to see them. I hope that last sentence didn't come out wrong, I'm assuming your looking at the accel. pump squirter and if it's clogged you can remove it and soak it in some carb cleaner.

Another thought, if you hooked up your distributor vacuum advance to direct manifold source (below the throttle blades) that could have signifigantly raised your initial timing. Keep us posted on your progress.
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