Forum Discussion
theoldwizard1
Sep 13, 2018Explorer II
Herdingdog wrote:
25,500 miles, v10, 6.8 liter. # 9 & 10 pistons only have 30 lbs of pressure. No idea why
Any decent mechanic can do something called a "leak down" test. It is a much better diagnostic tool than a simple compression test. That would cost a couple hundred dollars, but it would tell you specifically what is wrong, either intake or exhaust valves or rings.
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