Knock while foot braking?

[86WH1turbo]

I have never had it show up during WOT but I foot braked the car to about 7lbs and let off brake and showed 5.6 on scan master and the third yellow on the casper gauge came on. Any ideas? Running 93 w/dual nozzle alky.

 

[Heg87t]

I have never had it show up during WOT but I foot braked the car to about 7lbs and let off brake and showed 5.6 on scan master and the third yellow on the casper gauge came on. Any ideas? Running 93 w/dual nozzle alky.

Maybe the downpipe is rattling as the engine torques over when you foot brake? Do you have a torque strap on the engine?

 

[Just a Six??]

I get it in the burnout box but I dont worry about it. The rest of the run is fine.

 

[86WH1turbo]

I dont have a torque strap but I do have both poly mounts.