Bad Compression but Passed Leak Down Test

[Louis Steigelman]

I have a 2000 Civic Si B16a2. Brought it to the shop for a Catalytic Converter engine Light. The Cat that is on there is only 8000 miles old. I wanted them to try some tests to see why. During Initial testing they came up with compression across the cylinders in the 40 to 60 PSI range(should probably be around 200 with my higher compression pistons in). The Leak Down test passed they said… The whole engine was rebuilt about 10000 miles ago and all the internals top and bottom were replaced and fitted/installed by the machine shop. They are checking the timing but I just looked at the timing marks and they were perfectly lined up at #1 TDC. They are doing a valve adjustment as well before digging too deep. Any ideas on where my compression is going???

Thanks in advance

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[Zen]

Maybe a bad guage cause 60 psi or 40 psi is very low that car wouldn’t even run.

[Louis Steigelman]

That was my first thought as well, i guess when i get it home i will check it myself as well. I guess i will just see how my valve adjustment is currently, i heard too tight could cause valves to stay open and cause compression leakage.

[Author]

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