I replaced the harmonic balancer because I was getting some weird vibration comming from the engine under let's say 20 to 40% acceleration. If I went beyond that, the vibration would go away.
Anyway I changed the balancer and retainer and it didn't quite solve the vibration issue completely. The problem now is that I've got lots of KR. Around 1 to 5 degrees that show up from 3k to 4k RPM when going WOT from a roll and past 5K RPM both from a roll and from a dig.
I was running 20.5* of timming virtually knock free since the last time I tunned it in November. I'm not sure if this new KR happened because of the new balancer or not. I only happened to notice the KR because I tried a 3.0 pulley with the balancer change, but it gave me crazy KR, like 7* so I switched back to the 3.1 pulley but still had some KR to my surprise.
I dropped the timming back to 19 and still seeing some of it. I did a crank CASE learn last night, but it doesn't seem to help either. Gonna check the plugs today or tomorrow to see how they look and I also checked for vacuum leaks and none were found.
I'm kind of lost on this one. This car has historically had that werid KR issue always in which sometimes I get crazy KR no matter what timming or fueling I use and then for no apparent reason it goes away.
I also can't hear the engine pinging when this KR shows up. I don't think I've ever heard it ping at all for that matter, I'm not sure how much KR you should have to actually hear it ping.