Detonation - 01 Disco


Well-known member
Feb 19, 2006
01 Disco - been trying to resolve this for some time. Pinging and detonation (sounds like drivers side) marbles when accelerating, worse when warm out. No noise at idle or revving. I replaced a number of accessories thinking that might be the culprit. I use 92/93 octane. Have never heard detonation like this. No codes. Unplugged a knock sensor, no change and no codes - is that possible? Had head gaskets done and new heads 10k ago, no issues then except now have the detonation that has been going on for a month or so. Runs fine otherwise. Something in the heads? Other causes? Do knock sensors go bad? What should they read with a meter?

Thanks in advance