Petes93cutlass Posted November 29, 2012 Report Share Posted November 29, 2012 I just did a compression check three times on my 1994 3.4 DOHC Engine. What should the PSI be for each cylinder? Here are the readings per each test. Test 1 Test 2 Test 3 Cylinder 2 205 211 211 Cylinder 4 180 190 192 Cylinder 6 205 195 205 Cylinder 1 182 188 180 Cylinder 3 182 185 183 Cylinder 5 215 198 210 Are these within spec? Are these good or fair or poor or excellent readings Quote Link to comment Share on other sites More sharing options...
Andrew Posted November 29, 2012 Report Share Posted November 29, 2012 Its curious that your readings from different tests vary so much. Cylinder 5 17 psi difference between 2 tests? The readings seem good to me, other than you want no bigger than a 10% variance across the cylinders. Only test 2 would pass this. Quote Link to comment Share on other sites More sharing options...
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