small surge when coming to stop

[whackem04]

What should I look at and what should I log. I have DSP5 but it does it on all the tunes. The surge feels like a fuel surge like if I was going into lope mode, or maybe a sudden surge of air.

[LBZoom]

I would look at your pulse width tables, specifically where any modifications start. Possibly the truck is toggling between a modified cell and an un-modified cell...happened to me once when I made a tune. Maybe look at pressure and base injection tables too, anything to do with fuel, I don't think it's a turbo related issue, wouldn't have that noticeable of an impact. So just be sure to log all the necessary fuel data based on the links on the axis of each table you want to look at. PID's: throttle %, RPM, desired and actual FRP, and commanded fuel during the main injection. Hope this helps man!

Otherwise it could be a fuel pressure regulator, which would probably show up in the log as a difference in actual pressure vs. desired pressure. Do you have a lift pump or anything also?

[killerbee]

log fuel pressure and pulse, as well as vehicle speed.

You will probably see the correlation. If it happens at the same speed, while decelerating, it will be remedied by comparing the operation tables with the "idle mode" tables.

This is not an uncommon tuning mistake.

[whackem04]

what is the consensus on these?

[killerbee]

You didn't log fuel pressure and pulse. Just about everything else though. :)

[whackem04]

new log

[whackem04]

Anything?