1996 - 850 Turbo Wagon - Leak down test results help

[em45]

I recently completed a leak-down test for my 1996 850 Turbo Wagon but don't know enough to make any conclusions. The test was done with 90psi shop air. We opened up the coolant reservoir cap, oil filler cap, air intake, dipstick tube, and removed all spark plugs before pressurizing.Then, for each cylinder, we manually rotated the crankshaft pulley to reach TDC and performed the test several times on each cylinder, consistently obtaining the same results. We also tested during the exhaust strokes to confirm we weren't mistaking them for compression strokes.

I've read that you want the leak % to be similar across all cylinders but I am not sure how much of a difference is okay. The results also seemed unexpectedly good for a nearly 30-year-old car, especially on cylinders 3,4, and 5.

Any insight or tips are appreciated.

Here are the results:

leak down test results.png (16.61 KiB) Viewed 135 times

We noticed air escaping from primarily the oil filler cap and dipstick tube on all cylinders. There were no bubbles in the coolant tank.


Are the larger % losses in cylinders 1 and 2 indicative of anything?