Quote:
Originally Posted by tangofox007
No. While nice to have, it's not essential. You can plug the individual vacuum consumers in the door lock system to isolate the problem. And it's very improbable that the master valve is the cause of your problem.
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For someone who is not thoroughly familiar with troubleshooting a vacuum system.........and for someone who doesn't want to leave the engine running for hours.........a Mityvac is definitely essential.