Author Topic: 74 fleetwood vacuum advance not working  (Read 83 times)

Offline ithaca1230

  • 1974 Fleetwood
  • Posts: 41
  • Name: william epthimiatos
74 fleetwood vacuum advance not working
« on: June 15, 2017, 07:54:12 AM »
Spent a couple hours with the mechanic yesterday changing the points and trying to get the old girl tuned up and running correctly. One thing that we found was the Vacuum advance on the distributor was not working. What do you guys recommend. Is this part replaceable or should we replace the whole distributor. While we were there we replaced most of the old vacuum lines that were dried up. Car runs good with all new wires plugs cap rotor.
Thanks
Billy Epthimiatos

Offline CLC 30326

  • Posts: 160
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    • CLC Member
      CLC Member #30326
  • Name: A. Stromstedt
Re: 74 fleetwood vacuum advance not working
« Reply #1 on: June 15, 2017, 09:40:32 AM »
Would say you should be better off changing to an electronic ignition and a new coil http://www.pertronix.com/default.aspx.

Here is a way to do it on a car that is 10 years older than yours: http://6364cadillac.ning.com/forum/topics/pertronix-ignitor-ii-and-flame-thrower-ii-installation

Now I have to admit I am not sure how the -74 distributor is designed. But normally its very easy to replace the vacuum advance and cost of a new one is low. Use a vacuum pump if the screws are hard to get too.
« Last Edit: June 15, 2017, 09:42:30 AM by CLC 30326 »
Present:
1964 Series Sixty-Two Six Window Sedan
1972 Rolls-Royce Silver Shadow
2006 BMW 116i daily driver

Past:
1966 DeVille Convertible
1972 Volvo 164
Too many unimportant cars

Wish list:
2018 Cadillac Ciel
1964 Fleetwood Eldorado Convertible
1957 Volvo 832 Disponent

Offline ithaca1230

  • 1974 Fleetwood
  • Posts: 41
  • Name: william epthimiatos
Re: 74 fleetwood vacuum advance not working
« Reply #2 on: June 15, 2017, 10:03:16 AM »
Hey thanks! I will do some reading on this and see if it is something I can do myself.

Offline "Cadillac Kid" Greg Surfas 15364

  • Posts: 2623
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Re: 74 fleetwood vacuum advance not working
« Reply #3 on: June 15, 2017, 10:09:29 AM »
Billy,
The Vacuum advance is a replaceable part.  They are essentially exposed to gasoline vapor (via the vacuum connections) and have a limited lifetime.  Replacement is a very common task.
Even if you convert to another type of ignition you will still need a vacuum advance for temperature control, fuel economy and idle stability.
Greg Surfas
Cadillac Kid-Greg Surfas
CLC #15364
66 Coupe deVille (now gone to the UK)
72 Eldo Cpe  (now cruising the sands in Quatar)
73 Coupe deVille
75 Coupe deElegance
76 Coupe deVille
79 Coupe de ville with "Paris" (pick up) option and 472 motor
514 inch motor now in '73-

Offline Scot Minesinger

  • Posts: 4159
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      CLC Member #20543
Re: 74 fleetwood vacuum advance not working
« Reply #4 on: June 15, 2017, 10:32:40 AM »
I have three 1970 Cadillacs, two with electronic ignition conversion, the other with points and condenser, and while the conversion made absolutely no difference in performance or anything, the one remaining points and condenser Cadillac is the best running of the three.

BTW as Greg wrote that vacuum actuator is replaceable, and easily done.  The part is readily available.  Electronic ignition was an option in 1974 (first year).
Fairfax Station, VA  22039 (Washington DC Sub)
1970 Cadillac DeVille Convertible
1970 Cadillac Sedan DeVille
1970 four door Convertible w/Cadillac Warranty