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Vacuum Advance - 1986 - check valve?


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#1 tux

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Posted 01 August 2018 - 08:10 PM

Should an 86 have a check valve on the vacuum advance?  I'm looking at the vacuum diagram in the manual and it looks like it should

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#2 scott87star

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Posted 02 August 2018 - 06:08 AM

It wouldn’t function correctly with a check valve, normal operation is both vacuum advance and boost retard.
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#3 tux

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Posted 02 August 2018 - 06:38 AM

Didn't think so.  But that diagram... Clearly a check valve no?

#4 importwarrior

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Posted 03 August 2018 - 02:34 PM

It has been so long. But I believe there was a recall to remove it. Please don’t hold me to it. Research is needed for sure.

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#5 Indiana

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Posted 20 August 2018 - 09:56 PM

There's a few check valves but those are not in the direct path you need for the distributor to work.  They are so positive pressures don't get to the cruise and HVAC actuators.  The low pressure source comes from the intake and is supplemented by the vac. pump when needed then released out those little solenoid valves in the back right corner.




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