mjm-1957 replied to SierraHD17's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsFuel pressure sensor
mjm-1957 replied to SierraHD17's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsIf your truck is a 2017 l96 it is flex fuel correct? Read document ID #4518520 . The second paragraph details the fuel delivery system and yours does not have a fuel composition sensor.
mjm-1957 replied to D Ennis's topic in 2015 / 2016 / 2017 / 2018 Chevrolet Silverado & GMC Sierra 2500/3500 HDI am a mechanic in a Buick-Gmc dealer and have not seen many valvetrain issues on the 6.0's. The engines with AFM is another story altogether.I just finished a camshaft,lifters,vlom,and one cylinder head on a 2015 yukon with a 5.3 that had 37,000 miles on it Wednesday and today got a 2016 Yukon XL with 31,000 miles on it running on seven cylinders and making alot of valve train noise on the right bank, I pulled that valve cover off and have a broken exhaust valve spring on number 6 which is an AFM cylinder.It is almost always a cylinder with deactivation which either break the lifter or flatten the cam out.Both engines were clean inside and obviously maintained. We are seeing alot of theses lately.I am waiting on parts to finish this one Monday and hopefully it is just a valve spring on this one.
mjm-1957 replied to David12's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsCheck out document ID#4881898 (can't provide a link) If you google service update 17388 it will bring you to the correct document.It says it is for the pressure relief valve in the rear body allowing water intrusion into the cab on 2018 siverado and sierra, we have two 2016's in the shop right now leaking from the same area, carpets are soaked and stinks of mildew. It apparently affects other years also. If you remove the rear seat and trim , you can pull the padding away from the rear panel and you will probably see a puddle and rust stains from the lower portion of the vent. If your truck is brand new bring it back and give them this service update and doc id number.Let them deal with it under your warranty.
mjm-1957 replied to rocnrol's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsThey are covered for three years,36,000 miles
mjm-1957 replied to ScenicView's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsI am a mechanic in a Gmc-Buick dealership and also happen to own a 2017 2500hd 6.0 and I can tell you that is not normal. Did you just fuel up before it was left overnight? The way those fuel rails sit in the intake manifold has the number 7 and 8 injectors catching all the sediment and crap in the fuel. I would keep a close eye on it. The misfiring can and will damage the cats.
mjm-1957 replied to Sierra Boy's topic in 2015 / 2016 / 2017 / 2018 Chevrolet Silverado & GMC Sierra 2500/3500 HDCan never hurt to change fluids early. Do it while your buddy is still there so he can make sure they do what they are supposed to.
mjm-1957 replied to C.Meyer's topic in 2015 / 2016 / 2017 / 2018 Silverado HD & Sierra HD Issues, Troubleshooting, & Recalls/Service BulletinsDoes not have an external fuel filter.Put a fuel pressure gauge on the fitting on the rail and monitor it for pressure drop when shut off.The fact that it starts right up after turning the key on and waiting to crank sounds like What JD110 said above about a leaking check valve in the fuel pump module. The waiting pressurizes the rail and it starts normally.
mjm-1957 replied to gmcleer's topic in 2015 / 2016 / 2017 / 2018 Chevrolet Silverado & GMC Sierra 2500/3500 HDThere is a service bulletin about that and it says to see if the noise goes away with a full tank.If it does, they say its fuel sloshing in the tank and is considered normal.
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