Quote:
Originally Posted by Benz Dr.
There can be but that's usually only when applying the brakes. I would try pulling the vacuum line from the throttle valve to see if the engine changes speed which can tell you if the vacuum advance system is working.
Most of these old cars will need a distributor rebuild after 40 plus years of running.
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The speed does indeed change so the advance it working. BTW we have had a cooler couple of days here in Nashville and I noticed that the rpm drop isn't happening with engine at operating temperature. So it seems to have something to do with when the engine is not only operating at 180 coolant temp but the rest of the engine is also hot.
Brad