Another Old stang post..It tries to kill me!!!

[Mercury]

I had fixed the problem a week prior to posting this. It was the secondary system. There was no spring behind the diaphram, well that and the throttle springs were extremely week. The lack of spring in the secondary diaphram caused teh secondarys to open at anything over quarter throttle. The air rushing past the throttle plates over powered the week throttle springs and the plates flung wide open.

I put a huge gigantic spring on the throttle and a stretched, cut down spring from a holley kit, in the secondary system. No problems. Well my Secondarys dont operate consistantly. Time to take that modified autolite 4100 off and put a mechanical secondary holley on.