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Blue smoke after picking from the mechanic
I just picked up my 97 7.3, of 133k miles, from the mechanic. The right cylinder bank laid down on me and after a week of unnecessary and potently harmful messing around, the mechanic changed the IDM to make it work. First, he claimed the HPOP was bad and he replaced it (I found out just now that he did not, but he charged me for it, so that is fraud). He claimed the fuel pump was bad (which he broke and tried to charge me for). He was planing on replacing the the injectors; I told him to clean and replace O-rings, he said he did. His reason for changing the HPOP was oil in the GP (he thought I was stupid). I think very strongly that he pulled the injectors, didn't do a ring kit, allowed the oil to drain into the cylinders, replaced the injectors, and either hydro-locked it or came close to it, and that is how the oil came to be in the GP.
When I picked it up this morning We both took it for a drive. It started and idled smoothly; drove with plenty of power the motor was smooth and balanced. He said he did a compression test (I suspect because he hydro-locked it and wanted to find out if any damage was done) and the compression was right around 320 psi @ 5000 ft elevation, and all eight were close (if he is telling the truth).
I did make him write up a warranty agreement stating that he would pay for any damage that would manifest itself at a later time caused from Hydro-locking the engine. After convincing him to adjust the bill, we both signed it.
Unfortunately, about half way home it began to miss and I started to see blue smoke rolling out of the tail pipe. I am approximately, 90 miles from the mechanic and knowing he is incapable of repairing it, and I had already caught him in several lies all ready, I decided to just continue on home with it. When I pulled into the driveway it was running smooth again with no discernible lope.
After inspecting things is when I noticed the HPOP was the same old unit. At this point I decided to start looking for a lawyer before I talked to the mechanic.
Sorry for the long intro to my question; which is: would the intermittent lope and blue smoke be caused by bad injectors/o-rings, and if so how? Or is this a sign of bent rods, cracked pistons or broken rings or any other damage you can think of caused when he hydro-locked the engine. I should add the the mechanic has neither admitted to nor denied hydro-locking the engine.
Again sorry for the long back story, there is more to it, this is just the pertanant info for framing my question.