Scanmaster hiccup? Normal?

[turbo84gn]

What would cause this? Is this normal? 87GN, just cruising at speed, the retard and knock will climb, then settle back down, but I notice no change in the motor. Engine runs great. Here is link to video. Have a knock guage too, and it shows the same thing when the scanmaster does, so am thinking it is getting the indication from the computer. If it makes any difference, I can't use TurboLink, the data it reads is all over the place for everything. Says codes are set and dash says not, etc,. Like I said, car runs great.

 

[aminga]

From the way the road sounds in the background I'd look for something rattling in the chassis

 

[larrym]

check all your grounds

 

[dennisL]

If this is "false knock" meaning the knock sensor is picking up a rattle, the ecm retards timing for such a short time that you won't feel the difference while driving. However, it will take away from the performance so you need to find the source.

 

[CGASTON]

From the way the road sounds in the background I'd look for something rattling in the chassis

That is my thought exactly. I can here something rattling. Like the exhaust or something....... You can definitely here the road and tires.