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Compression check problem

  
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Compression check problem

 
lit549 lit549
V-6 Camaros rule! | Posts: 35 | Joined: 06/13
Posted: 07/01/13
07:29 AM

Well,in the endless search for my vibration I went and bought a leak down tester and compression gauge to check it since number 7 is oil fouled.When I do the leak down test with the pos gauge from harbor freight,it holds pretty good at tdc showing about 30 percent loss.Plug in compression gauge,do the test and it shows 150-160 on them but it does not hold,it comes right back to 0 psi..What is my issue? Leak down tester just plain scrappy? Or valves to tight cause it to not hold cylinder pressure? Number 7 wont hold any at all and plug is oil fouled.I'm getting about 5 mpg and a quart of oil every 200 mi!