924Board.org

[924-UK]

I read on another thread that you can test the vacuum advance on the distributor by blowing into the vacuum line going into it.

Is something on the distributor supposed to move?

All I get is a click from what is probably the diaphragm on the side of the distributor.

Is this correct?
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'84 924 2.0 NA

[scm924s]

Suck, don't blow!
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1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

[Beartooth]

You can probably suck or blow to figure out if you have a bad diaphragm, but the best way to check the vacuum advance is using a hand vacuum pump (like a Mighty-Vac). A slight leak is probably acceptable, but if you can't get to 15" or so, it's bad. If you take the distributor cap off, you should be able to see the pickup move as you apply vacuum; the other failure mode is that it's frozen. Finally, if you have a timing light, you can test it out fully. I don't have the number, but something like 10 degrees is typical.
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1980 931 diamond in the rough