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As mentioned above we utilize multiple methods to ensure that there is no trace of the tune on the ECM and to date, have had no warranty issues with any customer that has appropriately utilized our service. More specifics on how it works I can check and see if Justin (the tuner) minds sharing, and will update this response.@BlackBearPerf --just curious about this remark. True?
Like I said, if you really had an injector problem there WOULD be DTCs. There are so many DTCs now for slightly off fuel trim and such that there is absolutely no way there is a problem with those injectors and you don't have a DTC. What equipment is this shop using to test the injectors? Those numbers you posted in the first page look nothing like I've ever seen from the AFIT, which is the proper tool to test these injectors. If they aren't using an AFIT with the appropriate SIDI DMU and connector adapter for 17+ (which altogether costs upwards of $5000) then those numbers are absolutely meaningless.
You can file a complaint with the BBB. Then someone from GM will contact you that can offer assistance. Even assist with dealing with your dealer.
What everyone on GM side fails to see - why would I be spending 5+ days of PTO and $300+ of my money trying to solve the problem if my truck was perfect, the most precious asset is time. If I did not have the problem, I would not waste my time sitting at dealerships, on the phone, and driving to 4 different shops... 60+ miles one way...
This forum is fantastic as you guys give me hope that somehow I do not have to lose boatload of money in trading in...
I have a 2018 Chevy Tahoe with rough idle. Dealer says this one is normal also. Didn't know I had an engine with a racing cam that smooths out above 1500 rpms. This started after vehicle had 12000 miles. Seems to be a common problem. Definetly get Regional GM rep. involved or have GM buy it back under the lemon law.Take to another dealer and get a second opinion. Also ask to get the regional GM rep involved.