Why would a noisy injector get less noisy as the engine warms up? There is injector noise but there is also this other thing in this thread that we don’t believe is injector noise. Waiting to hear back from Toyota on the actual issue.
Lemon already?
- Thread starter Robbie
- Start date
They operate at a much higher pressure when the engine is cold.
There is a thread on the “other” forum that suggests something like 50psi when warm vs. 2500psi when cold.
Last edited:
engine knock noise
I also don't think this sounds like an injector. But... I have been wrong before. To me is sounds like an exhaust leak but I was told it was a cylinder 1 issue. Still waiting on official word back from Toyota Product Engineering.
Would laugh my butt off if it's an injector.
I have this noise and it does go away when warmed up. Seems part of the design, whatever it is since it is NOT random. Only specific engine loads, and only when the temp is coming up.
That said, I haven't given it much thought. My Mercedes had/has a similar lifter noise when cold. MBworld was full of posts deriding MB's downhill quality lol . 16 years and 255k miles later, that motor and transmission continue to set the bar on reliability.
Just because a user says it's a knock, doesn't mean it is one.
That said, I haven't given it much thought. My Mercedes had/has a similar lifter noise when cold. MBworld was full of posts deriding MB's downhill quality lol . 16 years and 255k miles later, that motor and transmission continue to set the bar on reliability.
Just because a user says it's a knock, doesn't mean it is one.
I think most of my comment around knock have been met with “question mark?” After it. Like “engine knock?” I’ve called out many times I thought it was an exhaust leak. The mechanics tore the engine down because of the sound.
Someone else in here posted a video of how loud the engine was from outside and I believe that one was presumed to be injectors. I do know on other Toyotas the injectors can be ridiculously loud and it varies in intensity whether it’s in a direct injection or port injection cycle.
Not saying that’s what you’re experiencing just noting that loud seems to be the norm.
The fact they ripped into the engine would seem to indicate at least someone thought there was another culprit.
Not saying that’s what you’re experiencing just noting that loud seems to be the norm.
The fact they ripped into the engine would seem to indicate at least someone thought there was another culprit.
It is somewhat similar to the direct injector noise of the Camry engine on this video. Especially after 30 second mark.
Or this video
- Jun 8, 2024
- 709
- Media
- 76
- 1,541
- Vehicles
- 2024 Toyota Land Cruiser, 2007 Toyota Tundra 4X4 Double Cab 5.7L V8
Perhaps because the D4S system will transition to port injection at idle once warmed up to prevent low engine load carbon build up, and take advantage of certain engine load conditions where port injection is more efficient than direct injection.
Probably the closest thing I've read on this thread.......
- Jun 8, 2024
- 709
- Media
- 76
- 1,541
- Vehicles
- 2024 Toyota Land Cruiser, 2007 Toyota Tundra 4X4 Double Cab 5.7L V8
Just my guess.
Start with the simplest explanation first.
Why is it noisy on a cold start? Because DI injectors are freakin’ noisy and this engine doesn’t have a cover on it.
Plus the engine will run pig rich to warm up the catalytic converter. The colder it is outside the more racket it’s going to make doing it. Hell it probably runs both DI and port on startup for all we know and sends vacuum to open the wastegate and get heat to the catalytic converter. If it has secondary air injection it will run that too when it’s cold to help push air to the catalytic converter, which makes noise for a few seconds.
Once it’s warm all that will change because the emissions system is “happy”.
A little google search got this for me. I know it’s 2021 but sounds like same issue
www.landcruiserclub.net
Engine rattle when accelerating
Hi everyone, I've just signed up to this forum because I'm trying to find an answer to the engine knocking I'm getting. I've got a high mileage 1hz that makes a very loud metal knocking sound when accelerating especially when cold. Once the engine is warm you can still hear it but just briefly...
www.landcruiserclub.net
Not the same engine.. is it?A little google search got this for me. I know it’s 2021 but sounds like same issue
Engine rattle when accelerating
Hi everyone, I've just signed up to this forum because I'm trying to find an answer to the engine knocking I'm getting. I've got a high mileage 1hz that makes a very loud metal knocking sound when accelerating especially when cold. Once the engine is warm you can still hear it but just briefly...
Nope
I wish they posted about what kind of sound I should be looking for.
Mine also makes the same sounds, but here are some examples that others have posted.
Is this an Atkins Cycle 4 cylinder? To me, it sounds like this could definitely have something to do with how the engine has been tuned by Toyota. It might be the kind of thing where Toyota sends out an update on the tune to quiet down this issue.
Last edited:
That 3rd video is mine, I'm going with that's normal for direct port injection and from what I've read on this post seems to back that up. I've not been to the dealer for them to look at it.
The thread you reference on FB is mine. I ended up going Lemon Law. Here’s why. That noise everyone hears in cold startup is NOT the injector noise. It’s what they call piston slap. Once the engine warms up. Everything sounds great. I had an issue because Toyota is calling it “normal”. I couldn’t see myself driving a $65k vehicle that sounds like it has a head gasket / exhaust leak. That being said. If it doesn’t bother you then drive that thing til the wheels fall off. There have been other models that Toyota has produced that have had this in the past. I just expect better engineering from a new car.
that sounds bad. I've never heard that before on mine. Whats the cause of piston slappage
