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How to test "loaner" Compression Tester & Vaccum Gauge Tester before use?
Topic Started: Aug 7 2014, 10:14 AM (701 Views)
bluestone
Member
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I've always had a problem with compression when it comes to my 92 Geo 5spd, base, especially going up hills. I cleaned the egr and replaced the pvc valve months ago and the problem persists. So, reading posts in this forum about possible causes, the recommendations are to first test the compression; after that, I'll test the vaccum. I'll be able to do this in several weeks. Until then, I'll just be careful but my question is this: How can I test the Compression Tester Gauge before I use it? Would I also need to test the and the Vaccum Gauge Tester and, if so, is there a test for this, too? I'm going to borrow them from either O'Reilly's or AutoZone. I borrowed a torque wrench from AutoZone a couple of weeks ago and, despite using it, sheared off two bolts that had not reached torque, at least according to the wrench. I solved my sheared bolts problem via this forum but before I actually use "loan" tools again I would appreciate tips on how to test the testers before I use them. Below is a review of a loaner Compression Tester Gauge Set from AutoZone:
OEM/Compression Tester Gauge Set, Part Number: 27138: "I recently rented this and was surprised when all my cylinders read 90psi. I tested the gauge on a few things and found it was reading about 20-30 psi low. I ended up buying a new one and all my cylinders read 170psi. Be careful when renting this, it might not work!"
Thank you! :)
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Memphis metro


If your concerned about the accuracy of the gauge just borrow two and see if they both jive the same. A lot of people do not install the compression gauge where it makes a good seal and get false readings and they do not perform the test as it should be.
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