Will do. My co worker has had very good service from another dealer in town. Last effort I’m going to have that dealer take a look at the truck in 2 weeks before my warranty is up I still own it then. After they can or can’t fix it then I’ll dive back into working on it. Thw truck is so pleasant to drive when it’s quiet it’s a shame it makes these noises.
Mine will do that at RPM as well pending how loudly it is currently acting. Its extremely throttle position related at lower rpm. That's how I found out you could mash the brakes and make it go away. I dropped the gears manually the other day when it was super loud. I also tried to turn the truck off while in a high gear to see if the noise went away but the programming on this truck immediately unlocks the TQ and the engine stops. Other trucks I have had would keep the TQ locked if you just turned the key to accessory then they didn't need to be started again, just turn the key back to run position.
Yeah, it just sounds louder in V4 because the frequency is less drawing you to the noise more. Mine doesn't even need to warm up to make the noise. I did it less than 1/4 mile from our lake house this weekend running across the landing. I have found that mine is usually quietest in the morning (cold or at operating temp). The road I drive that takes me to my highway commute is smooth and 55 mph. Truck is quiet as a mouse until you hit the first jarring bump on the on ramp. Then it varies in noise level all the way into work on the highway. Seems like after the engine sits all night and "settles" in the mounts (or the offending part settles) it is quiet until disturbed. It almost has to be fuel system related because of the direct link to throttle position and that the frequency changes while in MDS (4 injectors aren't being used during V4). I was yanking around on the fuel return and supply lines under the truck yesterday, they have a fair amount of motion to them. I am going to try and zip tie those into a different position to see if it changes anything. I am also going to ratchet strap the engine with some downward pressure on both sides to see if that goes in line with the bumps/hitting the brakes hard symptom.
Shit I forgot you did that. So, it has to be fuel system related ? I was laying under mine the other day with it in park and it sounded pretty noisy in the torque converter area. It seems like in my truck the noise only happens in TQ lockup. I wonder if it has something to do with the TQ. I just can’t see a smaller force like braking effecting that. Maybe its it’s a fuel supply or return line moving around ? I zip tied my return line at a different angle the other day and that didn’t change anything.
I highly doubt it’s the motor mounts. My money is on an exhaust leak at the sealing donut from manifold to pipe. It’s load dependent and usually exhaust leaks are pretty pronounced under load. My mounts were were replaced for shitty idle. (Still idles rough anyways) I believe the manifolds were removed to do so. I never had a peep out of the engine before that service was performed. God if help us if something internal is effected by external factors. Hopefully I’m finished with it next week sometime when I’m driving something different.
Update. As the noise gets worse you can down shift in manual mode to make it more audible while off the throttle. If you mash the brakes enough to get the nose of the truck to drop the sound will stop. I can replicate this any time at any speed at any rpm. Just keep some peddle to maintain load on the engine. So, that means there’s is either something moving downward and or forward that is causing the noise or the engine is moving slightly downward or slightly forward making the noise stop. Everyone with this noise noise give this a shot and see if it holds true.
Guys, got a little insight. My factory flapper is still in use. This noise is so relational to bumps/fast stops and acceleration I felt it might be exhaust related. Yesterday I pinned my flapper wide open. This morning the noise wasn't present until I hit a few pretty large bumps on a county road. While it was doing it it was much much less pronounced. It was also less frequent and didn't last as long when it started to do it. If I fix it I will let you know but it looks like I may be trading this weekend on a 18 Ram. Ride is so much better and the interior doesn't sound like it's falling apart on small bumps. (came from Ram looking for better reliability but I have had no such luck).
Mind does exactly this. I only noticed it after they replaced my motor mounts for rough idle so I think it might be exhaust related as it seems to quiet down when going over bumps. Haven't had any other time to investigate. Other times it just goes completely quiet and stays that way for a while. Also seems like maybe the fuel pressure regulator is keeping the fuel pressure high under low load making the fuel event louder ? Sounds very similar to the injectors when at WOT.
Agreed, lack of a catch can isn't an issue until it's actually an issue. I mean, if I have to pay 400-500 bucks to have a walnut blast done at 150,000 miles the next time it needs done will be 300,000 in which case I will be buying a new truck.
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