Toyota Trucks: New Tundra Engine Noise - Valves/Fuel Injectors ??

On Wed, 11 Feb 2004 03:53:15 GMT, WP <ca> wrote:
 

Piston slap.
It's quite normal when cold, but should go away once the engine warms
up.
As people demand more power, more efficiency, and cleaner emissions,
engineers have had to move the rings up, shorten the piston skirt, and
move the wristpin up.
The result is a less stable piston than the old 350 Chevy had.

Relax, our pistons are a ceramic composition and are actually as tough
as forged pistons.



--- Rich
http://richlockyer.tripod.com/

Got an '02 with same noise when cold, but goes away once warmed up. The
colder the start the louder it is. Get far enough above freezing and no
noise on a cold start at all.

It sounds to me like valve-train noise, not piston-slap as some promote.
Since the engine uses solid lifters, it is likely that something is out of
adjustment. Your engine sounds more out than mine, since the noise stays
after full warmup. I would have them adjust your valvetrain. My noise
completely disappears whem warmed. For 40 large, they should not be
bluffing you. They can re-shim.

Mine, I don't care because I'm getting rid of it soon.

If they refuse, try different dealerships. If that doesn't work, call the
1-800 Complaint#.



"WP" <ca> wrote in message
news:LGhWb.468092$.. 

Bob H wrote:
 



It is piston slap. And its normal. If you start it up, let it idle for a
minute or 2 before pedalling it, you'll never hear it. Shows up when its
real cold.

"MDT Tech®" <com> wrote in message
news:4iFWb.1053$news.pas.earthlink.net... 
of 

My ('02) ticking//whatever lasts for a good 8-15 minutes, depending on
outside temps.

I have let the truck warm up for like 5 mins., and it's still noisy on
pullaway depending on outside temps.

Weird.

Great engine otherwise. Wish the rig was 1,000 pounds lighter tho, and had
an auto. 5 speed.
Now we're talkin.

Since when has piston slap become "normal"? <G> I thought only lowly GM
considered this condition "normal"! What's happened over at Toyota?

MDT Tech® wrote: 

On Thu, 12 Feb 2004 16:39:53 GMT, "Jonathan" <com> wrote:
 

Re-read my post above.

People want power.
People want efficiency.
The government wants reduced emissions.

The rings and wristpin have been moved up and the skirt has been
shortened.
These help keep unburned gasses from being trapped and reduce friction
between the piston and cylinder wall. The bad side effect is that the
piston is less stable and you hear piston slap.

Nothing anybody can do about it. It's here to stay, and will continue
to be a problem.

At least Toyota has done it in a manner that does not have engines
blowing up.


--- Rich
http://richlockyer.tripod.com/

Bob H wrote: 

Bob, you may not be hearing a piston slap. Maybe have the clearances
checked?

 

Jonathan wrote:
 

Emissions pal. Shorter skirts reduce friction etc, but pistong get
sideways in cylinders. It not an issue, has zero affect on the life of
the engine. Its only heard on cold start ups with lots of throttle and
little to no loads. Gone with a minute of idling.