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I just made this thread, but it fits quite well here so let me post:
Alright so I've read the hell out of most of the DI failure threads. It seems the common understanding is that this failure is caused by detonation, which absolutely makes sense. This detonation is caused by "fast shifts" (>0.6 sec as per defined by a Toyota) where the computer cannot compensate quick enough and the engine experiences detonation on some (or all) of the cylinders for the first few revs upon of the reapplication of throttle....
While I can hear detonation on a really quick shift, it seems I can hear it a LOT more often than that now that I am looking for it. I only use Shell VPower 91. When my car is fully warmed up, most of the time if i quickly apply throttle I will have a few knocks, whether I shift or not. (Due to my previous experience with autos, I know for sure it is detonation). In the sheet supposedly taken from Toyota which re-tuned vehicles in south africa, it claimed this issue ONLY happened above 5200 RPM where our ECU won't pull timing.)
While I have seen several threads saying my DI seals are shot if i hear this detonation, I disagree. I have only ever heard one actual "pop" from the car, and it runs great with no CELs.
SO, where should I go with this? Take it into the dealer and take a tech with me and show him/her I can make preignition happen on command? I know I have no issues now, but from daily driving this will undoubtedly lead to DI seal failure or worse...
I was thinking I would take a printout of that sheet about the tune in south africa.... My car was built in the end of last Nov. Would I have the updated ECU Calibration? Opinions?
Let me add on for you folks in this thread, for the brief second it happens it is a harsh knock. It is not a ping or light pre-ignition I am talking about....
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