Bucking/surging issue

[Towrigdually]

Left yesterday to go get a new trailer. And I'm not sure if this is a tuner issue or a truck issue. Codes on truck are for ABS only. 

 

When the truck is running 70 at 2k rpm with XZT on the 75hp mode it'll surge.

I can drive it out with my foot and it'll go away below 1800rpm and above 2300 rpm. When cruise control is set it doesn't do it at all. 

When set to MPG mode it does it light surge and still have to play with throttle or set cruise to get rid of it. 

With switch to off its hard to tell when it surges. 

 

Now, with the trailer behind it and the switch to 75hp position, it surges when I'm going down a grade and try to keep my foot where it maintains a set speed but if I let off and just coast down its smooth. And when I'm trying to run 55-60mph if I'm between 2000-2250 rpm it surges but if I get to about 23-2400rpm it's no problem. Also, with cruise set it goes away. 

 

Hopefully someone one smarter than me can recommend something?

During the entire trip fuel pressure was never less than 15psi, fuel never below 1/4 tank, didn't break 190*f either. 

 

new trailer photo just because

[Dieselfuture]

Almost sounds like apps to me

[Towrigdually]

55 minutes ago, Dieselfuture said:

Almost sounds like apps to me

I was thinking that to, gunna try a reset tommorow after I wash all the grime off. 

Dont wanna fire the parts cannon just yet.

[pepsi71ocean]

@Tractorman happens to be dealing with this right now as well, but his seems to be more specific.

[Mopar1973Man]

10 hours ago, Towrigdually said:

When the truck is running 70 at 2k rpm with XZT on the 75hp mode it'll surge.

 

Too much timing. Lack of timing control with the XZT. Try turning XZT OFF and retesting I bet it goes away. 

 

10 hours ago, Towrigdually said:

With switch to off its hard to tell when it surges. 

 

Which this points to timing. 

Edited March 3, 2019 by Mopar1973Man

[hdpwipmonkey]

Its an issue with the XZT module like Mopar stated above.  That's one of the reasons why I shelfed the XTZ and got the Adrenaline.  I tried multiple tunes with the XTZ and the only one that didn't do it too bad was the XTZ+_BETA1 tune.  Come to think of it, I never tried any of the 1000 series tunes.  Maybe give one of them a try also.  Personally, I'd sell the XTZ on Craigslist and buy an Adrenaline.  I haven't had any surging issues with it and boy is it fun...

[Towrigdually]

2 hours ago, Mopar1973Man said:

 

Too much timing. Lack of timing control with the XZT. Try turning XZT OFF and retesting I bet it goes away. 

 

 

Which this points to timing. 

Ill give it a shot today after filling up. have about 2hrs to go. 

15 minutes ago, hdpwipmonkey said:

Its an issue with the XZT module like Mopar stated above.  That's one of the reasons why I shelfed the XTZ and got the Adrenaline.  I tried multiple tunes with the XTZ and the only one that didn't do it too bad was the XTZ+_BETA1 tune.  Come to think of it, I never tried any of the 1000 series tunes.  Maybe give one of them a try also.  Personally, I'd sell the XTZ on Craigslist and buy an Adrenaline.  I haven't had any surging issues with it and boy is it fun...

I'll have to download the tuner downloader software and try and see what helps. If not I'll be adrenaline bound. 

[Towrigdually]

after todays travelling, it goes away with the switch off. i guess its time to upgrade and learn.

[Mopar1973Man]

Sounds like it. 

 

This is one of the problems of "Canned Tuners" as you keep upgrading the truck with different turbos and injectors the canned tune no longer fits correctly. Just the mere fact of the injectors wearing out and pop pressure falling off will require adjustments to the tune to keep it running efficiently.