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QB93Z · 06-13-2012

If you are sure that the vacuum pump is working correctly (you said it was making noise), I would next check the secondary actuactor valve to make sure it is fully opening. It is possible to have the solenoid valve port vacuum to the actuactors, but also have a leakage path so the system will lose vacuum until the ECM turns the Secondaries OFF.

Another possibility is that you have one or more secondary injector(s) that is (are) clogged. I don't know any way to check for that without pulling the plenum.

We recently had an LT5 that only one side of the secondaries actually operated. Both actuators were moving, but the linkage to the operating levers was disconnected on the passenger side because a retainer clip had been knocked off during a starter motor replacement. By careful examination with a boroscope, we located the problem.

Jim

06-13-2012	#19
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: Stumblin Bumblin Z If you are sure that the vacuum pump is working correctly (you said it was making noise), I would next check the secondary actuactor valve to make sure it is fully opening. It is possible to have the solenoid valve port vacuum to the actuactors, but also have a leakage path so the system will lose vacuum until the ECM turns the Secondaries OFF. Another possibility is that you have one or more secondary injector(s) that is (are) clogged. I don't know any way to check for that without pulling the plenum. We recently had an LT5 that only one side of the secondaries actually operated. Both actuators were moving, but the linkage to the operating levers was disconnected on the passenger side because a retainer clip had been knocked off during a starter motor replacement. By careful examination with a boroscope, we located the problem. Jim