[skeefo96]

Well, here goes nothing! I am a Chevy fan Fan through and through. I feel in love with the first Tundra I drove. Could not afford a brand new one so I did want every "New toy craving guy" does...I find one I can afford and bug my wife until she let's me buy it. So my skeem is working out to my benefit, Right? No, I drove the truck home and back to work the next morning (about 100 miles) and my "new to me" 25k mile on it truck spews coolant all over the parking lot. I take it to the dealer they have if fixed and replace the water pump--> 25000 miles! So while its in and under warranty I ask the service manager to take a look at the 4WD and the Tranny to ensure that everything is sound cause I hear a Roa-ring sound as I drive down the highway. "Checked it out, all good buddy!" he told me. this problem persisted and I took it to a dealer closer to my home who took a look at the truck and said "We are going to order you a NEW (25000 miles on this truck) Passenger side axle. We will call you when it comes in."

Now the reason I write all of this is because I hearing this knocking sound as well and I am curious if I should have it check out while it is in the shop on Friday? Any advise to offer would be great or something else that may make them work for their paycheck on a friday?

 

[Larry Lawton]

I'm sure I'm just tellin' you what you're already gonna do...drop it off Thursday before closing and tell the service manager of your concerns. If he says it's normal, ask for the keys to three new ones and be the first to start 'em up. Then you'll know!

BTW, any other clues your "new" truck was in a collision or used pretty hard?

 

[skeefo96]

I'm sure I'm just tellin' you what you're already gonna do...drop it off Thursday before closing and tell the service manager of your concerns. If he says it's normal, ask for the keys to three new ones and be the first to start 'em up. Then you'll know!

BTW, any other clues your "new" truck was in a collision or used pretty hard?

not that I know of. The Carfax was clean, but we all know who much that actually matters. Thanks for the advise!

 

[NATEDAWG3256]

I don't have any knock or slap, but i get a weird howl or whine when i start up when its in the 20's or colder goes away in about 10 to 15 secs.

 

[seadragon]

I don't have any knock or slap, but i get a weird howl or whine when i start up when its in the 20's or colder goes away in about 10 to 15 secs.

Anything like this?...

 

[bandit572]

Whew, I read through all posts here. So what gives? What is the solution? Use a higher grade like 0 or 5 w30?? Or even a 5w40 oil?
Has anyone tried this?
I simply HATE the noise.

 

[off roader]

Now mine 07, has the knocking sound, the wife drove it and came home saying when at idle it sounds like one of those work trucks. Sure enough ,after 30 mile warmup its rattlin ?????

 

[Joe In PA]

Has anyone here gotten their truck fixed by a dealer for this or has everyone been told it's "normal?"

 

[FUNGUS]

This has been beaten to death. Any noise above "normal" is usually associated with lifter timing being adjusted while the engine is cold to facilitate faster warm up. This noise is constantly confused with knocking.... or piston slap. Another issue was the complaint that the truck sounds like a diesel with the knocking, this has been attributed to a leaky exhaust downpipe on the back of the engine. Replaced under warranty if this is the issue. Otherwise, the lifter issue is covered extensively in the owners manual.

 

[Joe In PA]

This has been beaten to death. Any noise above "normal" is usually associated with lifter timing being adjusted while the engine is cold to facilitate faster warm up. This noise is constantly confused with knocking.... or piston slap. Another issue was the complaint that the truck sounds like a diesel with the knocking, this has been attributed to a leaky exhaust downpipe on the back of the engine. Replaced under warranty if this is the issue. Otherwise, the lifter issue is covered extensively in the owners manual.

Maybe it's been beaten to death because no one has fixed it. I'm glad your Tundra has no issues, but mine and apparently a few others have a knock. I'm ok with the lifter noise and the diesel noise the truck makes because that's not the knock that I am talking about. My knock is also not a cold start thing. The knock is there no matter how long I drive the truck.

 

[Buffalobillpatrick]

I think that MY cold start noise is addressed by this post that I found somewhere:

"the noise you are hearing is piston slap (for lack of a better term).
A Cam-Ground piston is a piston that is ground slightly egg-shaped or oval-shaped. Different parts of the piston expand at different rates. There is more metal around the pin bosses than in the skirts, so these two areas grow to different sizes when heated. As the pistons are brought up to operating temperature they expand to become round and create the proper clearances. This is why an engine that is noisy when first started on a cold morning can run quietly after it has warmed up. The design allows for a much closer fit in the cylinder after the engine warms-up so that there is a reduction of blow-by gas, oil consumption, cylinder scuffing, and emissions.
The noise you are hearing is the pistons rocking slightly in their bores when the engine is cold. This noise is much more pronounced with the new short skirt pistons that Toyota and most manufacturers are now using to reduce friction and increase fuel mileage. Also, Toyota's taper-squish combustion chamber design exaggerates this piston rocking and the resulting noise that it produces. This piston rocking doesn't hurt anything, the noise it produces is more annoying than anything else."

 

[Freddy acevedo]

I think that MY cold start noise is addressed by this post that I found somewhere:

"the noise you are hearing is piston slap (for lack of a better term).
A Cam-Ground piston is a piston that is ground slightly egg-shaped or oval-shaped. Different parts of the piston expand at different rates. There is more metal around the pin bosses than in the skirts, so these two areas grow to different sizes when heated. As the pistons are brought up to operating temperature they expand to become round and create the proper clearances. This is why an engine that is noisy when first started on a cold morning can run quietly after it has warmed up. The design allows for a much closer fit in the cylinder after the engine warms-up so that there is a reduction of blow-by gas, oil consumption, cylinder scuffing, and emissions.
The noise you are hearing is the pistons rocking slightly in their bores when the engine is cold. This noise is much more pronounced with the new short skirt pistons that Toyota and most manufacturers are now using to reduce friction and increase fuel mileage. Also, Toyota's taper-squish combustion chamber design exaggerates this piston rocking and the resulting noise that it produces. This piston rocking doesn't hurt anything, the noise it produces is more annoying than anything else."

thank you for that my 2011 does that only on cold start does away after 23 minutes and runs quiet and very smooth have been concerned because its done that for a yr know but no problems just the noise had thought about getting a diagnostic done but just felt was no reason drives goes out of town pulls my boat like nothing other then gas which I’m fine with again thank you let me know if I should do anything to it or give me advise.
Freddy acevedo

 

[H2O_MAN]

My 5.7L had 270,000 undocumented miles when I bought the truck in 2017, the engine made all sorts of loud noise at start up and while idling. I concluded that there was a good bit of carbon and varnish build up in the engine due to one or all 3 of the previous owners not changing the oil and filters as often as they should have... the seller informed me that the engine used 1/2 a quart of oil every 5,000 miles, she wasn't lying. After much research I decide to try both pour-in fuel system and oil system cleaners sold by ATS

The engine has a little over 315,000 miles on it today and after two ATS treatments and 8 oil and filter changes it is very quiet. The amount of soft carbon grit that came out after the first oil system cleaning was scary, most of the grit must have come from the piston rings so I figured a 2nd treatment would not hurt a thing.

The injectors are quieter, there is no knocking sound, the timing chain tensioners are un-stuck and quiet, oil consumption is pretty much zero except for a slow weeping leak at the timing cover.

Your results may vary, but I am very happy.

 

[nainapayalii]

I race dirt bikes myself. I'm very familiar with piston slap, cold seizures and the like. These motors don't turn 14000 RPM and need the clearances that a 250F does.