my engine recently started rapidly losing power and knocking under the valve cover when under heavy uphill loads. Initially it would return to running fine when the terrain would flatten out. Now it knocks and runs erraticly all the time. I burrowed a compression tester from a friend and found these results. The numbers one and two cylinders were normal compression when tested dry at about 125 lbs. The number three cylinder had zero compression. The number four cylinder had very high compression at about 160 lbs. when tested dry. When tested wet the first two cylinders rose slightly as expected. The number three cylinder rose to just 15 lbs. and the number four cylinder maxed the tester out at 300 lbs. Any ideas?
Sep 6, 2014 at 12:28 PM
