Just had my Vmac II checked out for a few issues like a sticky rack, truck would kill at stop signs and cut out in the middle of a light or heavy pull. Just got pump back, need to set timing, valve cover say 6 degrees BTDC #1. And im thinking, " if i set this thing at 6 degrees BTDC, it shouldnt smoke that bad at startup like the Vmac 1 & 2 do?" What does the 20 degree econovace on the Vmac 2 do exactly. Is it all advance or does it also retard timing Follow me and reply to confirm or deny 1)More advance gives more time for a shot of diesel to burn in the cylinder, which equals less smoke, higher cylinder pressure, less bottom end feel(torque). TRUE/FALSE 2) Less advance gives you more smoke, lower cylinder pressure, bettter "seat of the pants" feel or torque, higher EGT due to unburt fuel and less air exchage (lower rpm generally) TRUE/FALSE 3) The mack Econovance system take oil pressure to advance the timing for a smooth idle? (this causes the smoke at startup?) TRUE/FALSE 4) The Econovance system only adds to the Advance(not retarding) of the pump, (6 degrees static plus 20 Econo = up to 26 degress in the proper situations) TRUE/FALSE if false, explain 5) The static time this pump to 6 degrees, is too shallow for a clean/smoke free start up and it requires more advance to run smooth at idle. TRUE/FALSE 6) If 5 is true, the econovance adds aprox _____? degrees of advance at idle? Thanks in Econvance NOID93