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QB93Z · 11-24-2009

The best test is to have the vacuum pump installed in the car and turn the ignition key to ON but don't start the engine. The vacuum pump should run for a few seconds and then shut off. You can hear it from the driver's seat, but if you have a doubt, have someone turn the key while you listen close to the pump. If the pump runs continuously or starts and stops periodically, then you have a vacuum leak in the secondary vacuum system. If the vacuum pump but doesn't make any sound, then it is faulty or you have an electrical problem.

Jim

11-24-2009	#25
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: Vacuum pump not coming on? The best test is to have the vacuum pump installed in the car and turn the ignition key to ON but don't start the engine. The vacuum pump should run for a few seconds and then shut off. You can hear it from the driver's seat, but if you have a doubt, have someone turn the key while you listen close to the pump. If the pump runs continuously or starts and stops periodically, then you have a vacuum leak in the secondary vacuum system. If the vacuum pump but doesn't make any sound, then it is faulty or you have an electrical problem. Jim