Quote:
Originally Posted by boris
My observations: I've made some maintenance work on the engine, including TB cleaning. After that I usually get somewhat higher idle around 750 RPM and hidden 0507code (idle speed). Driving in this condition, the engine runs surprisingly clean, no pinging at all. After the idle relearning procedure, the pinging immediately came back. I regret I did it  can't get back to higher RPM, fooling ECU somehow. I prefer pay more due to the lower MPG (if it occurs) than destroy the engine by pinging |
Interesting. I had my TB cleaned (rather pay someone $40 than mess it up and have to buy a new DBW TB) and my idle went from around 600 to what appears to be around 725-750 or so. The FSM states that a 700 rpm idle +/- 50 rpm is normal. I haven't noticed that pinging sound since and that is with much quieter tires and doing the rear window wind noise fix so my car is quieter.
Maybe I am not listening hard enough but it has always been quite faint even when I do hear it.