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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
First off we need to figure out what is not working to trace that wiring to see what they damaged. Can you confirm there is fuel pressure, ignition spark, and injector pulse.
Thanks for using Just Answer, and rating me so I am compensated, Chris
Since you have all of these things that can only mean the timing has jumped and there is no or low compression.
If the engine is not internally damaged. Correctly timing it will raise the compression back up. They could of driven the car till it overheated and blew the head gaskets or warped the heads or they could of over reved it and damaged the pistons and cylinder walls. Checking compression is next.
Your welcome, are you pleased with my help?
You are more than welcome to still follow up. I want you pleased with me and my answer(s).
Hello again Chris here,
The 17th at 8:12pm is the seventh day.
Will it at least crank?
Is the fuel pressure good, is the ignition spark occurring, is there fuel injector pulse occurring, will it start briefly using starting fluid?
What is the compression reading on each cylinder?