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Perform Initial Engine Test Fire

17:48
29:05
46.2K views

At 17:48 in

Twin Turbo Escalade Runs Again! The LSXcalade 427 2.0 FIRED UP!! (Final Assembly & Problems)

What happens here

Before attempting to start the engine, install a coolant temperature sensor. Then, perform a series of critical checks: verify all fuel lines are properly connected and sealed, prime the fuel pump to build pressure in the system, and confirm that there are no fuel leaks. Use a fuel pressure gauge to ensure correct fuel pressure. Additionally, ensure the plastic covers are removed from any new O2 sensors to prevent them from melting upon engine heat. Correct any identified misfiring issues by verifying coil wiring and spark plug connections. In the video, misfiring was caused by incorrectly ordered coil wires, which were then corrected. After all checks are complete, attempt to start the engine. Listen for any unusual noises and visually inspect for leaks. The engine should fire up, indicating a successful assembly.

Goal: Safely start the engine and verify its initial operation.

Tools and materials

  • Coolant Temperature Sensor — Monitoring engine coolant temperature
  • Fuel Lines — Delivering fuel to the engine
  • Fuel Pressure Gauge — Checking fuel system pressure
  • O2 Sensors — Monitoring oxygen levels in exhaust gases
  • E85 Fuel — Fueling the engine for the test fire

What they say

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fuel leaks things like that and check for fuel leaks see the fuel pump actually comes on well the throttle position works we got to take the plastic off the o2 sensors or it'll melt them i've been over there doing stuff before and had someone else in the truck like messing with the computer and it would do the heater thing about my arm and burn me like yeah stop it try to do stuff can you just check the fuel pressure um gauge and see if it has fuel pressure whenever we prime it [Music] yeah it moved yeah it looks like it anything leaking i don't see anything i don't either we ready to try it i guess so no idea what's gonna happen it has not made noise in like 400 days long time i'm a little bit nervous for you yeah okay we'll see what happens now it did free i'll do it on three one two three i think one of the coils is backwards cool there's some very pissed off dogs yeah that popping sounds like uh some spark plug is not where it's uh supposed to be uh then we want to take everything off no okay not the spark plug but like the wire yeah which side do you think it was coming out of the popping was that side i think so okay we'll check that one first all the plug wires are going to the right plugs it did something like this the very first time we were trying to fire it where the coil like the wires going to the coils were not the proper coils we need to flip flop them around but i never unplugged the coils when we took them out what happened the first time was i had the coils numbered like two four six eight but they were gone they were backwards they went eight four six like two four six eight from front to back back to front so we had to flip them around why are you still trying it because the more i listen to it the more i can gather what's going on it sounds like it's got dead holes okay so you have my conclusion is i am thinking maybe when i wash those coils that i missed a couple of them up so i thought that i put it back together right because when i remember i labeled those coils before i took them apart and i thought in my head that the numbers on them were incorrect for what they their corresponding cylinder was so i put them backwards well if you look at this factory rail you can see so for example this one would be like um two four six eight if it were on an engine how this this harness is the same as one under there so it should be the same all these have different color wires like it's pink red brown black and then you got pink green brown…

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