RET. NCO

I reset the whole thing by pulling the negative and leaving it over night. The next step cleaned the MAF Sensor, put cable back on turn key half way and exercise the accelerator slowly down hold for 2 seconds and retrieve into up position. That is generally called Throttle Body Reset and back the key out and reinsert and start and drive. This is what I did and I have a 2018 GMC Sierra 5.3 L83 engine. This is not a fix but a reprieve from this condition of stumbling thru gears and surge conditions. I have done this 2 times and it happened 1 time in 8 months since then for a brief moment?? No Rhyme or Reason???

I will say this after you receive a Tune run a Data Log after running the New Tune for 200 miles. Then have them check it mainly in the area of RPM Idle and Transmission Shifting/Performance. I have noticed with the 2014 5.3 L83 and my nephews 2017 5.3 L83 after tuning the need to bump the Idle RPM's, very small adjustments. The 6L80 6speed Trans can produce nice results when tuned but it may take the extra Data Log to update the Tune for optimal performance and longevity.

I just installed the Flowmaster 717787 for the 2014-2018 Sierra 5.3 L83 Engine. I will say this the Ball Connector Bolt was toast and the manuals I read stated 15mm to remove. The fact's are the bolt head is on top and it's 13mm on my 2018. I say this because if you go with a Cat-Back you will have to remove this clamp that is spot welded/tab again on top and it's attached to the flex pipe behind the cat. With that said I tried to get the bolt going but with 16,000 miles it was not going to happen so I used my Sawzall 6inch blade fine cut @ 18 TPI and cut the band behind the formed bolt thru. It took 3 blades nice and easy I believe this material has qualities consistent with Inconel so it can and will take the heat and this makes your blade inefficient so by 5 as I just cut the pipe and rods as that exhaust is junk but made of good material. I also installed the L86 Intake Manifold and TB. It sounds good and because the Flowmaster bolts into the back of the cat a set of headers and O/R Y-Pipe to have a little back-pressure for TQ concerns for future MODS I will have no concerns getting those into the new exhaust. The Ball Clamp was $39.00 at the GMC Parts Counter and is 2.75/ or 2 3/4 inch, it is made with the same material and the weld tab is present and fit like a glove and again well made for long term use at high temperatures without any fitment issues. The clamp was made in America! It was the solution I used for the removal and install and it took me 1hr at 18 minutes. I'm not young or have a lift cut remove install and I'm glad I did it. The next step is a Black Bear Tune as I have driven trucks that Justin Tuned and with these mods mentioned above and it was night and day. Retired NCO and God Bless America!