Ribtipram
Senior Member
Can you video it so we can here it. Post it up
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
My 2018 PW is knocking on start up then goes away after a few minutes. Brought it to the dealer over a month ago, and they said its normal. Well, now its getting worse and more frequent, so I have to bring it back in a couple weeks and leave them the truck for a couple days, so they can hear it when the truck starts up cold. Truck only has 9400 miles on it. I'm so pissed.
My 2015 6.4 has a cold start knock as well. I had a 2010 Ram 2500 with a 5.7 that had a cold start knock. My dealer put a new short block in around 13,000 miles for the noise and the new short block knocked too. They referred to it a "piston to bore phenomenon".
In layman's term the noise is piston slap when the engine is first started cold. GM 4.8, 5.3, 6.0 engines from the 2000's are famous for it. My wife had a 2004 Tahoe we purchased new and it knocked cold. My dad drives drives it now. It's 16 years old with over 150,000 miles and it still knocks when cold.