I am taking apart to Rebuild the carburetor I noticed in The base of the carburetorI or Manifolds Intake I see a butterfly valve.I suck air through the vacuum valve bat Doesn't close.What do you think it's supposed to close under vacuum?

Asked by GuruXP5T5 Nov 10, 2018 at 02:21 PM about the 1985 Mazda RX-7 GS

Question type: Maintenance & Repair

I am taking apart to Rebuild the carburetor I noticed in The base of the
carburetorI or Manifolds Intake I see a butterfly valve.I suck air through the
vacuum valve bat Doesn't close.What do you think it's supposed to close
under vacuum?

3 Answers

F_O_R answered 5 years ago

I believe that is your vacuum actuated secondary. Low vacuum would open it. High vacuum when you are at light throttle would close the butterfly.

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Hornet_2497 answered 5 years ago

F_O_R is correct. And looking at the photo shows that applying vacuum to that diaphragm would pull on that linkage and close that secondary until you are at full throttle and low/zero vacuum. Replace that leaky vacuum diaphragm.

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F_O_R answered 5 years ago

Try a vacuum pump on the solenoid. If you can get 17 inches of vacuum on it, it should close.

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