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Slight rpm surge after letting off gas after Diablo tune?

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Slight rpm surge after letting off gas after Diablo tune?

Postby hallcs [OP] » Oct 19 2019, 12:21am

Last night after receiving my new Diablo i3 Intune 8245, I successfully updated the tuner (connected to my PC), rebooted and checked again for updates until there were no more and I was told the unit was up to date. I connected to my truck and carefully following instructions installed the 87 octane tune, turned off the speed limiter and also installed the firm shift. After I went back in and modified the AFM/DOD to off, being careful not to change any other parameters, I did not even look around. Truck runs great and seems ok but I started to notice when I let off the gas pedal completely I get a rpm surge. At first I felt it, it was enough I thought that was weird, so I started watching the tach, no matter how slow or fast Im going when I let off the gas pedal completely, the rpms will surge anywhere from 50 to 150 rpms. Is this normal and I just never noticed before? Has anyone else experienced this? This truck is a 2016 Silverado 1500 5.3L with 20k miles
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby hallcs [OP] » Oct 19 2019, 12:25am

Sorry just to add, it is constant, and not intermittent. Also I have a Lew tune coming after I get my 150 miles in. Not too woried about this right now just wondering if anyone else has experienced this?
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby 19trax95 » Oct 19 2019, 12:37am

They will all do that to some extent. All the k2 trucks I've driven, tuned or not, will have a small bump in rpm when letting off or getting on the throttle.

It's much more noticeable when driving with a light foot.

However, you'll probably notice it tone down once you let the trans learn. It takes a bit to let them do so. Usually after a week of driving itll start shifting real good. Sometimes when you initially flash a tune or what have you, the trans will be sort of clunky and shift odd until it learns.
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby hallcs [OP] » Oct 19 2019, 12:50am

Thanks for the info. matter of fact I was trying to drive with a light foot. Even with the canned tune it runs so much better now, I was trying to see if I could get the MPGs back up. Before the mods I had a light foot, after the CAI and exhaust it seemed like I had to be heavy footed for it to run normal but now that I have the Diablo tune it is smooth like silk again so yes I was taking it easy on the pedal to see. Im looking forward to my Lew tune. Thanks again....
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby 19trax95 » Oct 19 2019, 12:53am

Drive how you normally do otherwise it will learn to shift driving with a light foot and will shift like a turd when you jump on it.

I drive hard and get decent fuel milage given what I've got done to the truck.
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby hallcs [OP] » Oct 19 2019, 1:03am

Thanks for the advice, I will do that. I am enjoying the truck so much more now after the tune. The mods made it sound good but it seemed like it was always wanting fuel. The Diablo tune brought it all together, like a different truck now, very responsive to the pedal now. I will stop looking at my MPGs and just start enjoying the ride. Thanks
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby 19trax95 » Oct 19 2019, 1:13am

Lews tune will make it even better Haha.
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby 06MonteSS » Oct 24 2019, 8:37pm

Every time you install a tune (or disconnect the battery), all of the learned items like idle, airflow, fueling/fuel trims, emissions readiness tests, transmission shifting adaptives, etc. all get erased/reset... It takes days/150+ miles to be put on for everything to be relearned by the ECM/TCM and settle back in again....
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby roorancher » Oct 24 2019, 8:46pm

06MonteSS wrote:Every time you install a tune (or disconnect the battery), all of the learned items like idle, airflow, fueling/fuel trims, emissions readiness tests, transmission shifting adaptives, etc. all get erased/reset... It takes days/150+ miles to be put on for everything to be relearned by the ECM/TCM and settle back in again....


So, Lew, I replaced my battery a few weeks ago....Do I need to reload your tunes? And should I hook up the I3 to my desktop and let it update first?

Thanks!
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Re: Slight rpm surge after letting off gas after Diablo tune

Postby roorancher » Oct 24 2019, 8:47pm

roorancher wrote:
06MonteSS wrote:Every time you install a tune (or disconnect the battery), all of the learned items like idle, airflow, fueling/fuel trims, emissions readiness tests, transmission shifting adaptives, etc. all get erased/reset... It takes days/150+ miles to be put on for everything to be relearned by the ECM/TCM and settle back in again....


So, Lew, I replaced my battery a few weeks ago....Do I need to reload your tunes? And should I hook up the I3 to my desktop and let it update first?

Thanks!


Oh forget it..I saw "erased" and then "relearned."
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