Vacuum pump? Why does it buzz every 10 seconds? [snappic] - Page 3 - ZR-1 Net Registry Forums

bad-zr1 · 01-15-2013

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.

Hib Halverson · 01-15-2013

"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.

01-15-2013	#21
bad-zr1 Join Date: Sep 2011 Location: Corunna Mi Posts: 8	Re: Vacuum pump? Why does it buzz every 10 seconds? [snappic] 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.

01-15-2013	#22
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Vacuum pump? Why does it buzz every 10 seconds? [snappic] "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. __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878