dss LT1 Posted January 26, 2007 Share Posted January 26, 2007 My 72 LT-1 recently failed the AZ emissions test. It passed under load and failed at idle. It has a new MSD ignition system that is set at 36 degrees total advance (before mech adv).I am trying to fine tune the carb (original Holley, recently restored) to lean out the idle and balance that off with maintaining a reasonable idle speed and mixture. I am also not running the original AIR pump (not sure that makes a big difference).I have read some of the tuning posts on CF. I have adjusted the mix screws on either side of the front of the carb - about (a little more than) one turn out from lightly seated. How should the accelerator pump be adjusted? I believe that if it is set to aggressively it could be adding fuel at idle... not sure how I would know if it is set properly.Any other suggestions from the crowd?Dave Link to comment Share on other sites More sharing options...
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