Originally Posted by SonicVQ

Was the accelerator pedal pushed to the floor?

Compression test was done after heating up the engine a good amount and then taking everything apart to do the compression test and fuel pump fuse pulled, i did floor the accelerator pedal before and during engine cranking though just to make sure injectors weren't firing.

Compression gauges have a check valve so the pressure doesn't drop to zero after cranking has stopped (where a intake/exhaust valve may be open)
IF after your test, the pressure dropped, that is a gauge issue, not a cylinder issue.


I thought that might be the case, but in the case of all the other cylinders they did not leak compression like cylinders 3 and 5 did and i left the gauge on each cylinder for a good minute after cranking had stopped.


1 quart in 3,000 miles is in the normal range and you don't need to worry.
Start to worry when it burns a quart in 1,000 miles.

Good to know, I'll keep an eye on it.



Assuming the gauge is accurate, my stock VQ37 has an intake vacuum at hot idle of around 22 in/Hg.
You might be on to something here...

Tested with the same gauge before i had it tuned and it was at the same 22 in/Hg as your stock VQ.



If this was my car, I would not worry about anything and just drive it.
However, for your pease of mind, I hope you can get a leak down test done.
Good luck!