After getting the recall done at my local dealership (on my 2019 2500 mega cab bighorn) to swap the cp4 (about 1.5 years ago) I noticed a boost leak sound coming from my left ac vent / steering wheel area. It was only noticeable when hitting 20-25lbs of boost, below that it was undetectable. My exhaust break was also less effective. I brought it back to my local dealership twice who ultimately told me there was nothing by wrong as the truck was throwing no codes. I even made the tech come for a drive with me to show him the noise. He confirmed he did hear the sound and it wasn’t normal, but there was nothing they could do though I shouldn’t worry about it. I asked them to perform a boost leak test and they said they did not have anything to perform that test with. Long story long. I haven’t been back there since and the sound never got better. I decided recently get a banks intake kit installed to address the possible looming heater grid bolt failure many are worried about. A friend recommend diesel mechanic and I brought it to him for the install. He found what I had been fearing all along. That I’ve had 2 missing intake manifold bolts causing the sound at high pressure. I’m assuming the intake manifold / heater grid had to come out during the cp4 recall (let me know if this is correct) . So basically I’ve been driving for over a year missing 2 bolts and the truck blowing boost to the wind, and sucking in unfiltered air possibly as well. My mpg was down to 15 ish max the entire time and 5 days after this kit has been installed with normal driving I’m back up to 18+ mpg. I’m wondering what problems this caused long term and what recourse I may have now. Having a boost leak for that long cannot be good for and engine. @RamCares please reach out to me with any insight.
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