Mine has near 6000 miles on it. It does make the diesel noise, but did not start untill it got colder out. It does not bother me. I used to own diesels and when I here the noise it makes me think I have a diesel under me. Hey, look at at it this way. If it blows up it is under warranty and then guess what. A new motor. Ye haw!
I don't really care for the sound. I will bet you that this same engine in the Sequoia will NOT sound like this. It will be as smooth and quiet as silk.
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2007 Tundra DC TRD 4x4
Pyrite Mica
Bucket Seats
Cold Kit
Deck Rails
Tow Mirrors
Door sill protectors
I must be deaf in one ear and can't hear out of the other.......it just doesn't sound like a diesel to me and it damn sure doesn't STINK like a diesel. I can hear injectors firing, making a light click, click, click, click, click but what EFI engine doesn't. With 32 valves, 4 timing chains, 4 camshafts and that old school, belt driven, radiator fan how can it not make some sound. Geeeeez. I'm amazed at how quiet it is on the inside.
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'07 RCSB 5.7L SR5 Silver Sky Metallic (The Silver Bullet) Yep....it's gotta HEMI
Never argue with an idiot. They will bring you down to their level and beat you with experience!
Compare with the typical pushrod engine, 1 (very short) timing chain w/o tensioner, a single cam muffled from being in the center of the block, 16 valves, 16 rockers, iron block (most have aluminum heads now), 10W-30 oil.
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2007 Tundra 5.7 6-spd 2wd
Silver, double cab, short bed
TRD package
Okay, I have read all the posts on the diesel noise before the engine warms up on the 5.7. Mine does it as well, and it does not have to be very cold for it to do it. It is obvious that we have some very intelligent mechanical minds on the site by the posts submitted. That being the case, why can't we get a definite explanation as to why this is happening. All I see are possible explanations ranging from piston slap to overhead cams to timing chains. I had piston slap on my last Chevy, and it sounded much more destructive than the diesel sound I am getting. It would be really nice to know for sure what is causing this, and with as many trucks as there are with this problem(or issue), sooner or later we will get the honest, complete explanation. Once we do, then we are one step closer to a solution, if there is one. Is this a coverup, or does Toyota really not know what is causing it? It is a very annoying problem, and somewhat embarassing considering the price of these trucks.
To me, it does sound more like a valve train issue than a piston issue, but again that is my speculation.
I had the diesel noise on cold starts, after taking to 4 different dealers they admitted it was a bit noisey and agreed to call the factory rep. Good thing I was there when the rep showed up because he said NO to fixing it but after a secound test drive and some arguing he agreed to a loaner car and reolaced the short block which had 3 cyclinders scored per the machanic. It sounded like a tap, tap, tap. I thought it was the lifters or something in the top of the motor but it wasn't. Good luck.
The 1st generation Tundras would knock on start up, especially on a cold morning if too thick oil was being used. Does anyone have a knock or tapping who are using 0W-20 Synethic?
If those who have the knock would post the weight of oil they are using, maybe we can figure out if the problem is caused be the oil. Also post if Dino or Syn oil.
Has anyone tried just to see using a VERY thin oil like 5-30 or something? Just to start it and try wouldn't hurt anything and would eliminate the fact that its oil based in the upper part of the motor for the most part. Has anyone taken cylinder pressure in all 8 cylinders brand new and at about 10,000 miles? If its piston slap/scored pistons or sidewalls, cylinder pressure will drastically reduce initially at least. I really think it is just noisy, and I worked on tons of different engines before and each one sounds different. Agreed that some are quieter than others... Didn't mean to sound like an *** earlier with the comment, just not sure I would jump to conclusions. It really isn't that loud compared to other bigger technology driven motors. Listen to the Z06 corvette, ford v-10, srt-10 dodge, some hemi's I have played with. These larger engines with gadgets like VVTI and other forms of performance modifiers seem to have added noises. I have also blown up quiet a few and heard valve taps, rod knocks, piston slaps, spark knock, chain lash, lose cam gears. Instinctively it does not seem like a big problem to me, but I am wrong as we all can be. Still looking into it I guess.
PS - Wonder if Toyota used the same technology as on the 3.4L 5VZ-FE (self adjusting valves). It could to me POSSIBLY sound like a valve adjustment issue.
Josh
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2008 Salsa Red Pearl DCSB SR5 2WD
Corsa Sport Single Exit, Doug Thorley's, 20% Tint up front, Line-X, Access Roll-Up Tonneau, Alpine Touchscreen Nav, Sirius Satalite Radio... VA 757 Area Group MEETS
Future Mods: Color Matches Grill, Lowering Kit, TRD CAI, Wheels, Fender Flares, Supercharger, JL Stealthbox, Black Headlight Mod...
Yep, makes excellent sence. Have built a few hot rod Chevys with forged pistons, they are noisy until warm.
Quote:
Originally Posted by 96T100
the lexus use a timing belt not chain. same with the 4.7 that was in the previous tundra, its belt driven. one theory is that the 5.7 use forged piston and rods. so when they heat up and expand the noise goes away.
Hmmm. Sounds good to me. I for one do not think it's a "problem". Sure the start up is loud, but not loud enough. Now if the engine is warm and you have driven it for some time ,and still make that loud start up noise, then you have a problem....For now I'm good.
.02
KRLT
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2007 Black 5.7 Crewmax SR5.
Black Leather
50% front window tint
20% back window tint
PS - Wonder if Toyota used the same technology as on the 3.4L 5VZ-FE (self adjusting valves). It could to me POSSIBLY sound like a valve adjustment issue.
Josh
The 3UR-FE has hydraulic, automatic valve lash adjustment.
The dual VVT-i system is very oil dependent. I get somewhat of a clacking, or knocking type sound from my 1GR that is louder when cold and only occurs at 1500-1800rpm on the throttle without load, and that's only VVT on the intake side in each head. It concerned me at first, and I made a video of it for sound purposes in case something ever happened, but nothing did. Our Tacoma's (and others) 1GRs are also plagued with the infamous exhaust tick under load when cold, which is more of an annoyance than anything. I wouldn't rule out those SS headers on the 3UR-FE. They may be thin enough to allow some of the sounds of the engine to escape.
Unfortunately, the VVT-i system cannot adjust the valves with low oil pressure, which is the main reason Toyota developed VVT-iE, or electric motor driven VVT on the intake side, to adjust the valves even at startup and during times of low oil pressure.
Also keep in mind that this is an open deck engine series, and the 3UR is not a typical big bore engine either. It uses quite a lot of stroke to accomplish its 5.7L (102.11mm). In fact, the 3UR uses the exact same bore as the older 4.7L 2UZ, which is 94mm, so these aren't overly large pistons moving up and down. The cylinder bores are cast WITH and are PART of the engine. Piston slap would be extremely noticable with an open deck engine and it'd clearly come from the bottom end. Since the deck is open, the piston slapping sound from the cylinder bores would reverberate up and down the block making it even louder. It would also, possibly, cause a longetivity issue, since the cylinder bores have no block casting around them. Toyota typically inserts a hard, temperature resistant piece of plastic between the block and the cylinder bores. Hardly enough. The piston skirts are also coated with a wear resistant moly resin. Piston slap could chip that away, and the engine would see increased friction.
Toyota uses very tight clearances, which is why you can use a 0W-20 oil and not see oil consumption. Try doing that on a worn engine and see how long that lasts.
Re: Diesel noise explanation
I'm amazed at how quiet it is on the inside.
. Now if the engine is warm and you have driven it for some time ,and still make that loud start up noise, then you have a problem....For now I'm good.
Linear Mode
