PtheDude Posted December 2, 2007 Report Share Posted December 2, 2007 guys, do I need the funky vacuum switch doo-hickey? it was inbetween the carb and the dizzy advance. can I plug it and run without it? I'll post a picture later. Quote Link to comment
datzenmike Posted December 2, 2007 Report Share Posted December 2, 2007 The vacuum switch on the thermostat housing does not or should not be connected to the vacuum advance on the dizzy. If you have the stock Hitachi carb, there are two vacuum supply ports on the valve cover side of it. The front one goes to a 'T' with one line to the distributor advance, and the other to the charcoal cannister, a totally benign addition to the overall smog system, that has no effect on performance. Check that all hoses are tight and not leaking. The second vacuum port, more to the rear of the carb should connect to the funky switch doo-hickey on the thermostat housing and from there, (on the '75-'77s) to the EGR valve. Check that all hoses are tight and not leaking. If you just can't run with the EGR, at least disconnect it properly so as to not cause yourself problems later. Pull the hose of the REAR vacuum port on the carb and plug the port. That's it. Quote Link to comment
PtheDude Posted December 4, 2007 Author Report Share Posted December 4, 2007 running a webber, so I go direct from the carb to the dizzy. I can either block off the switch dohickey or leave it disconnected? Quote Link to comment
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