back ground info:
I purchased my 2011 Equinox with the 2.4l, AWD, and 58k miles in Nov of 2016.
Replace high pressure fuel pump (GM recall)
Manual shifter cable replaced (done by selling dealer for free)
Replaced spark plugs, front o2 sensor, map sensor, and differential and transfer case fluid (nasty black) myself.
Had transmission fluid completely changed by pushing old fluid out with new fluid. (Again black and nasty)
Cleaned a very dirty throttle body. (Much better idle)
New pistons, rings, and timing chain (GM warranty)
Replaced thermostat when they had my engine torn apart. (My cost for part only. Opening too soon...but no check engine light lol)
Replaced catalytic converter (GM warranty)
Replaced cracked exhaust manifold (purchased warranty)
Replaced AC condenser (purchased warranty)
I did do a leak down test a few weeks ago.
Numbers were about 95, 96, 89, 98. I chalk the #3 cylinder to my not getting top dead center.
I did have some high fuel trim numbers. LTFT was around +6% to +9%. Changed out the MAF sensor right after the leak down test which cured that.
I am waiting for the transmission to fail soon. GM may or may not cough up for their mistake on that as well.
However, I have the purchased warranty that last 4 years or 48k which will pay for that monstrous bill if it does.
I have an appointment next week with the dealer that rebuilt the engine.
I am fairly confident that it is the High Pressure Fuel Pump that is the problem.
I think the next part that I will replace will be the entire car....
Edit- just a note, when I changed my oil, I ended up with about a half quart to a quart more than I had put in it...