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  #1  
Old 08-06-2005, 09:53 AM
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Is the vacuum diaphragm on the Dist. supposed to hold or bleed?

I tested the diaphram mounted on the distributor on my 4.5 ('72) with a mityvac and it does not hold vacuum but leaks. Is this supposed to bleed off as mine does or hold vacuum tight like most diaphragms are designed to?

Thanks

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Old 08-06-2005, 12:20 PM
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should be tight. -CTH
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Old 08-06-2005, 01:39 PM
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Thanks...that's what I suspected

I guess I have to put one on my shopping list!
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Old 08-06-2005, 08:19 PM
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FWIW, mine has a leak (not anything super-fast), but still works as it's supposed to. As long as it retards the timing (and slows the engine) when given a vacuum, it's working as designed. If it does have a vacuum leak, it would: 1) Be too small to matter if it still works, and 2) Would not interfere with the engine at all, because the vacuum for this comes off the throttle body and NOT out of the intake manifold where the brake booster supply, door locks supply, tranny supply, and MAP come out of.
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Old 08-06-2005, 09:13 PM
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OK, thanks...that leads me to my next question...the vacuum to this is controlled by an electric controller valve mounted on the firewall...when is the controller supposed to apply vacuum to the diaphragm?

When I apply vacuum manually it does throttle down some but when I checked it there was no vacuum present at the line going to it...I assume I either have a leak or the controller valve was preventing vacuum from reaching it. Knowning the conditions under which vacuum is applied would help me to figure out if the controller is working...thanks again!
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Old 08-07-2005, 02:36 PM
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Vac should be applied at any time except 3rd gear, or when the engine temp rises above 212 and the aux fan turns on, I believe.
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Old 08-07-2005, 04:01 PM
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Then I probably have a vacuum leak or faulty control valve...I'll have to investigate it further.
Thanks again!

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