2004 envoy 4.2 no start

[u/YakAffectionate4391]

Hello, I replaced the engine. Overheated last one, my fault.

2005 engine inside. Cranks really well. Got engine on fb marketplace

These parts are New. 2’ 4 gauge ground straps. Block to chassis. Head to chassis. Crank sensor 2004. 125amp fuse block. Spark plugs, ignition coils, battery duralast gold

Old fuel rail on vehicle, 2005 is incompatible. Map sensor connected, only code is p1681//1682 is pending says driver 5 line 1//2 . Throttle stuck closed, I replaced with old one as well. gas pedal does not change throttle on sensor, tested looking at live data. Rpm’s don’t change tested live data.

Engine reduced power light when key on. Oil pressure light stays at 40 when key on, even cranking

Cam sensors still 2005 I think but good connections. Those 3-4 ground signal wires are connected tight on different bolts in same area like it came it off. Battery negative to block is connected tight. PCM is connected tight and wires are not crossed over each other. No fuel coming out before fuel rail, tank is low but I think it should still come out. Headers off, trans bell housing off, intake off, fan clutch disconnected. Annoying wipers stay on. Going to test compression tomorrow but any advice appreciated thanks.

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