Note that as a vacuum gauge is used on various engines, sometimes you’ll notice what’s typical for one model as compared to another.Īlso, engines can have lower vacuum motors, while others can have higher ones. However, your best analysis when it comes to vacuum readings will come from your own experience. This means that the guidelines given here are a good starting ground for vacuum gauge troubleshooting. Remember that manufacturers publish vacuum specs in service manuals, however, this isn’t as common as it was years back.īut the physics of the internal combustion system hasn’t changed in over a hundred years. When at idle, the normal manifold vacuum for any engine in good working condition is about 18 to 22 in.-Hg.
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