mikerlew

View of melted air intake mainfold

View of the ground 104 on the driver side behind engine block
I swapped out my 4l60e on my 04 Suburban, and pulled one that looked in decent condition from a 01 Suburban. Minor differences, but long story short everything is connected, I ensured that crankshaft turns by using a ratchet, and torque converter turns by hand before bolting to flywheel.
Transmission is lined up correctly, and I filled the fluids and went to start, and it cranks but won't start.

The strange thing is that after I attempt to start it, if I try again the car won't even crank unless I turn it all off and wait a bit or just wait too (with key on to accessory mode)

I thought that maybe the starter wasn't making contact, but I marked the flywheel and it turned after trying again.

I didn't mess with the fuel system, and the only variables was that I placed a loose ground (Ground 104) to the transmission bolt, but I have since removed. The other variable is that my lamp fell and melted the Air Intake manifold. The melted part was on the arm that doesn't connect to anything, (possibly a dead end to stabilize pressure?). I heated that manifold to close it up, but I don't imagine this would cause a no start.

Any ideas? No engine codes that aren't emissions related.
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shakenfake

The arm is the Heimholtz resonator, just takes out noises for sensitive humans.

You sure your battery is good?

When you say you removed the ground, what does this mean?

strutaeng

I thought that ground behind the head is the one that grounds the injectors? Maybe I'm wrong. But definitely needs to be connected.

There's actually like 2 grounds back there.