Sudden full knock after shifting

[samh_08]

When I shift from 2-3 I get a sudden 8 degrees of KR and it slowly reduces over time. It does not look sawtooth at all, but rather a smooth ski slope.

Any ideas? (Log attatched)

[joecar]

Do you hear anything mechanically bumping (e.g. exhaust on chassis)...?

[5.7ute]

Is burst knock active in your tune? Burst knock shows up as KR on the scan tool.

[samh_08]

No bumping that I can hear anyways. Wouldn't that be a short knock burst if something was hitting?

I'll have to log burst knock once. I was told to leave burst knock alone because it needs to be there..

[samh_08]

I logged burst knock and it never registered anything. Does this mean its false knock from something hitting, or something in the tune?

[Chevy366]

There is a way to tell if it is false knock or not through a log, I think it is that if the spike happens and then tappers off slowly it is a false knock, maybe someone else can chime in on this topic.
Here is a link to some screen shots of real knock Joe put up. http://forum.efilive.com/showthread.php?22771-Knock-retard/page2&highlight=flase+knock+in+log

[EagleMark]

Hard to tell looking at log, your at 4500 RPM and 44% TPS then floor it.

4500 RPM 44% TPS and 26.5 spark advance goes to 9.5 spark advance when TPS% is 100 and KR is 7.7 should be 18.8 so in tune your loosing 9.3?

Knock in your log does not look like real knock!

A better log would be a WOT run from lower RPM. Not WOT from 4500 RPM. The way your logging it, it looks like noise?