Pinging/knocking at 2000 to 2300 rpm
I have a T Sport with 135k on it, it drives fine and the CEL light is not on. However in 6 th gear if you roll on acceleration at about 40 mph it pings like crazy till it reaches 2300 rpm. It's done this a bit for a long time but it seems worse recently. The car burns no oil and seems fine in all other respects.
I try to avoid driving in this region but clearly something is wrong does anyone know how to diagnose what this issue is. It has always been serviced by Toyota so should have the right plugs etc.
I run on premium fuel either Shell V Power or BP Ultimax so it should not be the octain rating.
I see in diesel cars this is often the ERG valve, is that a likely issues in the
I have tried some injector cleaner as it's simple to try but it didn't help which is not much of a supprize as V Power should do that anyway.