Re: CEL - "random misfire" (recurring)
The engine calibration itself is NOT different... Which is exactly why the Engine Tech didn't mess with or re-flash the actual TK Software again (And YES, I did ask him)... But the individual sensors (again, where they are and what they do are beyond me) in the engine & the heads need to "communicate" effectively with the PCM/ECU...
Think OLD SCHOOL for a minute (and I'm not doubting anyone's intelligence or level of experience, just trying to explain)... Engine timing on a 1969 BOSS 302 was done with a strobe light that pointed directly onto the tick marks printed on the outside of the crank itself... And the only way after rebuilding or replacing an engine was to make sure you were at TDC (Top Dead Center) before you were able to accurately set the timing by rotating the distributor (assuming points and condenser) by hand... Otherwise, the engine would cough and sputter (ie, misfire) when you revved into the higher RPM ranges...
Now in today's engines all of those functions are handled by electronic sensors that measure relative position, movement, etc. So my assumption was that all of the sensors in my 2012 BOSS 302 engine just needed to be "reset" so that the original PCM/ECU could know what to do to keep the engine running smoothly all the way from 0 to 7,500 RPM... And FWIW, the Eng Tech said he talked to someone at Ford Racing while going thru the process this morning just to verify what he was doing was correct... And the only thing he was told to do different than what the computer software was saying was to make sure and rev the engine all the way to 6,000 RPM instead of the stated 4,350 (which was also approx where the engine would routinely throw the P0300/P0304 codes)...
And I might be completely off base and talking out my ass, since I haven't tinkered with any electronic engine management system like this in my entire life... And we may have just gotten "lucky" with following a procedure intended to fix one problem, but ended up solving mine instead... But I do know that once this "procedure" was completed, EVERYTHING was back to normal... And unless I told you that the entire engine had been yanked out and replaced, you would never even know the difference...
But believe me, I have tried 3 different times today to replicate the code(s) I got on my drive to the Dealership earlier this morning... Went down the exact same roads at approx the same posted speeds and tried to shift as close to 4,000 RPM as I could just to try and make it misfire... Used both keys... And nothing happened... Checked the Torque App numerous times, with both keys in the ignition, just to make sure there were no codes still "lingering" in the ECU... And every time, there were none... The only data point I can't capture for now, is taking this NEW engine all the way to 7,500 RPM just to see what happens when I hit the Rev Limiter...
But speaking of Rev Limiters, wouldn't these unexplained Misfires also occur at the Limit set by the Launch Control ??? Does the engine do anything different at 7,500 RPM versus 3,000 PRM if that is where the LC has been set by the user ??? I don't know, just throwing that tid-bit out there for people to chew on...
And please don't construe that I am an "EXPERT" or just trying to get "MY POINT ACROSS" to everyone else who is having these same issues... I'm simply trying to post up what worked for me and my particular situation... Just like I posted about what happened 3 weeks ago out at the Track... However, I do wish I had a more detailed explanation as to why I was having these misfires in the first place ???