Possible shift flare?

[cstephens93]

Ive noticed ever since I got my tunes from ATP a month or so ago, my truck feels like it shifts weird.

When cruising and I give it more gas, right as it goes to shift, it feels like my truck stalls or lags for a second. The RPM gauge on the cluster shows the drop in RPMs like I'd imagine it should, it just feels like it hesitates for a second.

Some days it feels like it shifts completely fine and smooth, and other days it feels like it shutters for a split second. Is there anyway to log anything with a V2? Or this could all be in my head, not sure, but it just doesnt feel quite "right" but that may be placebo.

No transmission codes, never limped it or anything.

 

[S Phinney]

That sounds like a defueling issue. Depending on how it was addressed when it was tuned, adding power will magnify the factory defuel effect.

 

[bml2200]

Throwing this out there, but I'd record all the speed channels you can to see if something is slipping. Also record engine commanded speeds.

 

[S Phinney]

Double check your tranny fluid at operating temp as well. It will cause weird shifts as well by being just a little low.

 

[cstephens93]

Alright I'll try to check that out. What specific PIDs do I need to take a look at in the Duramax Imperial list in EFI LIVES scan tool?

 

[IOWA LLY]

Best way to test for issues is reload your stock tune and test.

If it shifts correctly it's tuning related.

If it still has issues it's transmission related.

Reset the transmission adapts after switching tunes.......

 

[Dukcaln]

OP any updates?

 

[dirtboy726]

I was hopng for some results on this, as i have some of this happening from time to time as well.
to me it just feels like i lose all fueling for a half a second then it kicks back in and away i go.
hopefully we get some more feedback on this.

 

[cstephens93]

Best way to test for issues is reload your stock tune and test.

If it shifts correctly it's tuning related.

If it still has issues it's transmission related.

Reset the transmission adapts after switching tunes.......

OP any updates?

I was hopng for some results on this, as i have some of this happening from time to time as well.
to me it just feels like i lose all fueling for a half a second then it kicks back in and away i go.
hopefully we get some more feedback on this.

I'm going to reload my stock tune file as soon as I get my V2 back from my cousin. Im thinking it may actually be tuning related since I never noticed it before, however being tuned by Rob, Id have to think its weird for his tune to be acting up

 

[Mike L.]

Sounds like defuel.

 

[cstephens93]

Sounds like defuel.

Is defueling a tuning-only related issue?

 

[Chevy1925]

Is defueling a tuning-only related issue?

yes and a good thing although too much can make it act like your talking about.

 

[IOWA LLY]

No. Several things can cause it. Tuning is the main one though.

Start with the stock tune test and go from there. No matter what the results are it will eliminate a lot of things very easily.

 

[cstephens93]

yes and a good thing although too much can make it act like your talking about.

No. Several things can cause it. Tuning is the main one though.

Start with the stock tune test and go from there. No matter what the results are it will eliminate a lot of things very easily.

Okay I will try the stock tune file and see if it still occurs.

Now if i do need to send a log to ATP, what specific PIDs do i need to highlight?

 

[IOWA LLY]

You would need to contact atp and ask them. Do the test first.....

 

[cstephens93]

You would need to contact atp and ask them. Do the test first.....

I'll give that a try and see what happens