I'm a new, first time owner. I had my car put on a dyno today and see an unusual drop on the graph toward the top end....the guy said he didnt know what happened there....anyone have any ideas?

This is an '88 AT with 112K....I believe this run was done in 2nd and Bowden cable was not disconnected at all...any ideas what caused this ? Is this cause for concern?
Thanks.

 

what was the AF ratio doing?

 

Never saw an A/F readout. Don't think they were tracking it. This was a very spur of the moment test, these guys were kind enough to get me in on a moments notice after the shop I had made reservation with did not honor the reservation.

 

Then in that case if I had to guess I would say it got a few degress of timing pulled out of due to detonation.

 

Dyno operator lifted a bit.

That's a lot of power to lose and the graph is nice and smooth.

 

was that the trans shifting to 3rd (the bowden was not disconnected)

 

Hall sensor, or knock sensor fault pulling 6 deg out....