question / knocking on 91
Ok so i just read this whole thread and i have a question not addressed.. I use 91 octane from a wholesale club all the time in my manual IS.. 130k miles, all services done so far.
when i am engaging gears, (and only then), i hear pinging.. (with windows open and listening for it). not while i'm accelerating, not with AC on while going up hills, only while i am letting clutch out.. then it stops pinging. (average driving, not racing).. If i engage gears extra slowly, i still hear a little knock.
All i have added under the hood is an intake.. which i may remove just to figure out if too much air is the cause. (i had a cat back exhaust once too but i don't believe anything was re-programmed by my installers)
An engine either knocks or it doesn't in my understanding, right?.. so i'm stumped besides the CAI or possibly i'm not really getting the proper octane gas that i'm paying for.. Any thoughts?
""Knowledge is power." Francis Bacon."
Last edited by shark7; 11-09-2011 at 06:14 AM.