I consider all but cylinder 1 low, and even that one is 20 PSI lower than it was last fall. Cylinder 1 was 170 and they went downhill from there. I've been assuming lower compression was from cylinder wall wetting, but it may be the valves which I already knew don't seal completely--leak down test is bad.

cyl 1: 170
cyl 2: 145
cyl 3: 130
cyl 4: 150
cyl 5: 125
cyl 6: 135

I'm considering yanking the engine again, pulling the heads and trying to solve the leaking valves--which is on every cylinder. Over the winter, I got new exhaust valves, lapped and installed them, as well as lapping the intake valves too.

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Donald Foss
2003 E53 3.0i, 5L40e (for now)
- self-rebuilt engine, valves, SL oil pump
- ported heads, both sides
- N55 intake manifold, 70 lb injectors
- GTX 2860R-clone 60mm top-mounted turbo
- progressive slip diff
- under chassis cats
- extra sensors wired to Arduino
- 15" touch screen dash-mounted