I have a 2014 Sierra with the 5.3L, I really don't like posting on the forums for issues because it can give a bad representation of what is generally a good vehicle. My truck never really exhibited any of the usual issues like the vibration but it has had a couple small fixes here and there. Moving seat, rusting frame, etc. this time I just wanted to give everyone the heads up.
Well a couple months ago I was driving and the oil pump failed. It took 2 weeks to fix. When it happened I was pretty concerned about any possible damage it caused but the dealer said it looked ok.
Fast forward to last week. Merging onto the highway, heard a pop and lights came on everywhere. Got it to the dealer, lifters collapsed on a cylinder. I was without my truck all last week as they fixed that issue.
This sunday, less than 60 miles after I picked it up, I went to accelerate in town and heard the same pop but this time it wouldn't even move if I gave it throttle. Towed it down to the dealer and they finally looked at it yesterday. This time they are ordering me a brand new engine.
Thankfully I still have powertrain warranty but this is a major disappointment and honestly I don't even trust the truck anymore. What would your recommendations be? Sell it, trade it, keep it and run it into the ground?
I don't know much about this system, how it operates, the stress that is placed on the lifters during cylinder deactivation. How common is this failure? Been watching some YouTube videos on the repair and it's very labor intensive...heads have to come off, etc. I see that you can buy the entire kit (lifters, gaskets) for around $500.
Have a friend that told me...just change your oil, you'll be fine. The number one cause of this failure is neglected maintenance. That true? Or is it an inherited problem with the design of the system?
The system came out in 2007, there must be some improvements made to it since then, no?
I must say that the AFM is allowing me to get some excellent fuel economy out of a full size truck.
So is this a common problem, or are there people with 200,000 on these trucks that never had an issue with it?
Ordered a RANGE AFM Disabler today after reading through this forum and others.
I don't drive many miles per year - my '14 has a little over 23,000 miles on her - purchased August '14.
Truck goes in and out of V4 a lot. Just can't see it helping much with the hills around here and my short trips.
Hello, I looked 2008 GMC Sierra 1500 that I was interested in purchasing with the 5.3L V8 has 174,000 miles. Truck runs rough at idle, rpms are fluctuating. Check engine light is on with codes P0300 and P0301. Can’t troubleshoot the problem. Coils, spark plugs, spark plug wires, new O2 sensors, new catalytic converters. Guy says that rockers all move so it isn’t Active Fuel Management lifters and he says 150 psi of compression across all 8 cylinders. Truck was at dealership, dealership says problem with cylinder numbers 1 and 8 the P0301 explains problem with cylinder 1 but why isn’t code P0308 being thrown? What else could be the problem?
Installed a 3" Motofab level on my truck last weekend. Rear is stock. Added 20x12s with 33x12.5 tires. Minor plastic and metal trimming, no rub at all.
Smoked my tails and 3rd brake light. Will smoke my front turn signals and corner markers this weekend.
Will also vinyl wrap the chrome mustache on the bumper, unless someone wants to trade for all black.
Going to do a muffler delete (leaving resonators) and clamp the flapper valve open, will also add a Range AFM delete.
Has 30% tint now, will eventually do 15% this summer.
Will post more pics as I make progress.
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