2.4 Rattle / Knock noise under load - does yours sound like this?

[TacoKiwi]

My last oil change I switched to 5W-30, engine is a lot quieter now. Yes I’m aware Toyota recommends only 0W-20

I would keep the same grade but switch to a high quality oil like Amsoil. If you had engine problems and the dealer found out the change then it would be a world of hurt for your wallet.

Sponsored

 

[Texas Bob]

I definitely like the price of Amazon's soundproof mat compared to the one Toyota sells. Just curious, do you feel this made a noticeable difference in reducing engine noise inside the cabin? Also did the Amazon product come with clips/grommets for attaching mat to underside of hood, and did the holes in mat align with corresponding holes in underside of hood, or did you have to drill any new holes ? Sure looks much nicer than the adhesive applied square sound panels.

The Zekzoop mat in the link appears to be the same as the one I installed on my 2025 Off Road non-premium. The installation was easy with supplied fasteners and existing holes. However, I would describe any noise reduction as minimal. I still hear the clattery diesel noise at times when the engine is heavily loaded. Mine is a manual transmission so I suppose the automatics may downshift and not have the same racket as when mine is at lower revs and higher load. I do not lug my engine but I do often use moderate to heavy throttle at revs below 3000. I think that's when the marbles start bouncing around the coffee can. BTW are there still those big, steel coffee cans?

 

[aaudiholic]

Between running 91 octane and 0w30 oil, the noise has pretty much went away on mine. I plan to keep this thing for 20 years so that’s going to be its diet.

 

[Mercedes]

To the OP's comments about sounds, yes, mine often sounds same. I haven't RPM-wise mapped out the rattle you're interested in, but I routinely hear it.

Ford's Coyote V8 has a similar noise, the "2K rattle". It happens around 1700 RPM and is loudest when the engine is cold. Many believe it's the DI pump in action. Some think it is piston slap.

Agree with others on the drivers of the noises: DI, high compression engine, if using low octane fuel and having no hood insulation. I felt a lot of what I was hearing on test drives and after taking receipt were the characteristic sounds of this engine. Still, it was kind of noisy.

The dealer I purchased from is a stone's throw from a Kwik Mart. No surprise if they gassed-up there with 87.

At second fill I was looking forward to re-up with Shell Premium. The next day and since, truck is noticeably quieter. Any power gains received and additional pre-ignition protection are welcome.

Sponsored