alscott
Well-Known Member
Im running a 22r with an impco 425 and model E converter. Balance tube is run as it should be from mixer to converter. This is a blow through system. It ran flawlessly except for a high idle of 3000-4000 rpm once it got to temp. I put a brand new impco 425 on it and it totally changed the way the motor sounds. Its like it totally cut the fuel out its getting to a 1/8 of what it was. The idle problem is fixed but as soon as I hit the gas it chokes out and will die. No air leaks, converter is not pushing propane. If i pull the top hat off the mixer to where it has a 1/4" gap or more from where it seals it runs perfect. Its like the top hat is choking the new mixer somehow. The new mixer is the only variable that has changed. Its setting on a holley base plate same as old one mixer was. Any thoughts other than putting the old mixer back on? Any help appreciated
