Quote:
Originally Posted by steve25
It’s my understanding that if the EGR does not function then the motor will have a lean condition unless steps are taken to correct for having the EGR disconnected.
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If the EGR does not function the inert exhaust gas it would normally let into the combustion chamber won't enter, so the car will be more likely to ping. Although with a '73-'74, with low compression, doubtful. EGR only has vacuum on the carb side of the diaphragm, so if the diaphragm is torn, that would cause a ported vacuum leak if all the thermo switches still work.
An EGR not working in itself will not cause a lean condition unless the diaphragm is torn, which is not likely even on a 50 year old valve. Much more likely that in this case the carb is too lean for whatever reason.