Strange noise
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If you're not noticing a loss of power, then something loose inside the exhaust would make sense. It may be louder when towing the boat because the sound is reflecting off the boat back to you.
If you are also noticing a loss of power, then I'd suspect a misfire, especially since you just changed the spark plugs. I'm not sure if your 2009 is a coil on plug (CoP) or if it has plug wires, but a connection could be loose or damaged, or possibly one of the new spark plugs has a cracked insulator. Misfires are often more noticeable under a load (accelerating, hauling a load, etc.).
-Rod
If you are also noticing a loss of power, then I'd suspect a misfire, especially since you just changed the spark plugs. I'm not sure if your 2009 is a coil on plug (CoP) or if it has plug wires, but a connection could be loose or damaged, or possibly one of the new spark plugs has a cracked insulator. Misfires are often more noticeable under a load (accelerating, hauling a load, etc.).
-Rod
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The first thing to check on rattles, noises, and vibes: is it speed related or rpm related? In other words, does it always happen at a certain speed or certain rpm. If RPM, check the engine and exhaust. Usually, it's exhaust. Even an external heat baffle that's loose will vibrate at a certain rpm. Speed-related will be drivetrain, suspension, and wheel bearings and such.
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I'm having the same noise on my 2012 1500 SLT 4.7, Based on where I think the noise is coming from I'd agree it's exhaust related. Its a rattle at certain RPMS at low speed, does that describe your problem as well? IF SO, did you pinpoint it yet?
I also noticed that when I'm towing my boom lift (5070lbs) its very pronounced going uphill from a stop sign for instance. I'm replacing upper plugs today so we'll see if misfire is possible.
I also noticed that when I'm towing my boom lift (5070lbs) its very pronounced going uphill from a stop sign for instance. I'm replacing upper plugs today so we'll see if misfire is possible.
Last edited by cjames1173; 04-23-2019 at 06:42 AM. Reason: Left something out