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#21 |
Join Date: Sep 2011
Location: Corunna Mi
Posts: 8
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There is a vacuum reservoir located under the plenum. If the vacuum level in the reservoir drops below 41 kPa (12" Hg) the pump is turned "on" to supplement engine vacuum.
But with the engine idling you should be over 12" and so the pump will not turn on or run. If you are pulling less than 12" at an idle you have a problem. |
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#22 |
![]() Join Date: Jun 2005
Location: CenCoast California
Posts: 899
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"scottfab" and other are correct.
If you're secondary vac. pump runs that often, you have a leak or a faulty component somewhere in the secondary port throttle vacuum system. Troubleshoot the port throttles using the information in the FSM.
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Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878 |
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