I finally got a chance to do some data logging tonight. 27K knock counts in about a 10 minute drive. Watched the whole datalog so at least I know it didn't turn over in that time frame. So it's less than it was before I put new plugs in and tightened stuff, but still significant. I'm getting a lot of knock retard in the 3 deg or less range, but also getting some up to 10 deg in heavy accel or load. And it was showing 3 deg on the freeway at steady 60 mph, no hill. (but it was only a mile on the freeway)
How do I know if this is real knock or it's just hearing something mechanical? Truck has stock L31 valvetrain (roller lifters) and also Comp Cams stamped steel roller-tip lifters. Would either of those cause noise?
In your case, how would it register any knock at all if the KS is disconnected? (Not being a smart ass, I just want to know) Should I do that test?
One last question, I have PE turned off for narrow-band VE tuning. Should I turn it back on? Maybe a lean condition during accel is causing knock? I'm about to switch to WB tuning so I think it should be on anyway for that?
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