loud engine knock at start-up - 05 sequoia

It happens with some engine designs. The engine oil runs down and there is
not much lubrication for a few moments. Also a bad oil filter backflow
valve can possibly contribute. Also make sure they have enuf oil in the
engine.



"sg" <spgmkg@earthlink.net> wrote in message
news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> My new Sequoia with less than 4k miles sat for 3 days and at start up
> knocked loudly for 4-5 seconds before quieting down. The temp in the
> garage
> over those 3 days was between 35 and 55 degrees f. The oil had been
> changed
> by the dealership at 2,500 miles. I like an early change with a new car.
> The knocking was so loud it seemed loud with the windows closed. The
> dealer
> said this is "normal" when the vehicle is not driven for 3 days. I have
> never had this exeperience before with cars I left for as much as a week
> or
> two undriven.
>
> Is it normal?
>
>

I can't believe a loud knocking could ever be described as normal. If it
really is a knock (rod or main bearing) that could be quite serious,
certainly not acceptable in a newer vehicle. It sounds as though the oil
pressure is not normal for some reason. I am assuming you checked the oil
level. If it does it again I think you need to return it to the dealer and
demand an explanation.
jor
"sg" <spgmkg@earthlink.net> wrote in message
news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> My new Sequoia with less than 4k miles sat for 3 days and at start up
> knocked loudly for 4-5 seconds before quieting down. The temp in the
> garage
> over those 3 days was between 35 and 55 degrees f. The oil had been
> changed
> by the dealership at 2,500 miles. I like an early change with a new car.
> The knocking was so loud it seemed loud with the windows closed. The
> dealer
> said this is "normal" when the vehicle is not driven for 3 days. I have
> never had this exeperience before with cars I left for as much as a week
> or
> two undriven.
>
> Is it normal?
>
>

Thanks for the reply. Oil level looks good. Filter is genuine toyota I have
to believe, since the dealer did the oil change. I was afraid that I am
being handed a line of BS to avoid dealing with the problem, if there is
one. This really effects my confidence in the dealer.
sg

"jor" <jor@jor.com> wrote in message
news:iMudnUbs-rxGLb7fRVn-tA@giganews.com...
> I can't believe a loud knocking could ever be described as normal. If it
> really is a knock (rod or main bearing) that could be quite serious,
> certainly not acceptable in a newer vehicle. It sounds as though the oil
> pressure is not normal for some reason. I am assuming you checked the oil
> level. If it does it again I think you need to return it to the dealer and
> demand an explanation.
> jor
> "sg" <spgmkg@earthlink.net> wrote in message
> news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> > My new Sequoia with less than 4k miles sat for 3 days and at start up
> > knocked loudly for 4-5 seconds before quieting down. The temp in the
> > garage
> > over those 3 days was between 35 and 55 degrees f. The oil had been
> > changed
> > by the dealership at 2,500 miles. I like an early change with a new
car.
> > The knocking was so loud it seemed loud with the windows closed. The
> > dealer
> > said this is "normal" when the vehicle is not driven for 3 days. I have
> > never had this exeperience before with cars I left for as much as a week
> > or
> > two undriven.
> >
> > Is it normal?
> >
> >
>
>

You should be able to test his theory by going out on the lot and cranking
up a couple of new trucks that have been sitting there for a week unsold.



"sg" <spgmkg@earthlink.net> wrote in message
news:KwOUd.7933$MY6.3520@newsread1.news.pas.earthl ink.net...
> Thanks for the reply. Oil level looks good. Filter is genuine toyota I
> have
> to believe, since the dealer did the oil change. I was afraid that I am
> being handed a line of BS to avoid dealing with the problem, if there is
> one. This really effects my confidence in the dealer.
> sg
>
> "jor" <jor@jor.com> wrote in message
> news:iMudnUbs-rxGLb7fRVn-tA@giganews.com...
>> I can't believe a loud knocking could ever be described as normal. If it
>> really is a knock (rod or main bearing) that could be quite serious,
>> certainly not acceptable in a newer vehicle. It sounds as though the oil
>> pressure is not normal for some reason. I am assuming you checked the oil
>> level. If it does it again I think you need to return it to the dealer
>> and
>> demand an explanation.
>> jor
>> "sg" <spgmkg@earthlink.net> wrote in message
>> news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
>> > My new Sequoia with less than 4k miles sat for 3 days and at start up
>> > knocked loudly for 4-5 seconds before quieting down. The temp in the
>> > garage
>> > over those 3 days was between 35 and 55 degrees f. The oil had been
>> > changed
>> > by the dealership at 2,500 miles. I like an early change with a new
> car.
>> > The knocking was so loud it seemed loud with the windows closed. The
>> > dealer
>> > said this is "normal" when the vehicle is not driven for 3 days. I
>> > have
>> > never had this exeperience before with cars I left for as much as a
>> > week
>> > or
>> > two undriven.
>> >
>> > Is it normal?
>> >
>> >
>>
>>
>
>

On Mon, 28 Feb 2005 17:19:13 GMT, "sg" <spgmkg@earthlink.net> wrote:

>My new Sequoia with less than 4k miles sat for 3 days and at start up
>knocked loudly for 4-5 seconds before quieting down. The temp in the garage
>over those 3 days was between 35 and 55 degrees f. The oil had been changed
>by the dealership at 2,500 miles. I like an early change with a new car.
>The knocking was so loud it seemed loud with the windows closed. The dealer
>said this is "normal" when the vehicle is not driven for 3 days. I have
>never had this exeperience before with cars I left for as much as a week or
>two undriven.
>
>Is it normal?
>


It's the famous I-Force piston slap and it is perfectly normal.
It's worst on cold mornings (sounds like a Duramax), even if it's only
been sitting overnight.
My '03 Tundra has done it from day-1, and I have over 105k on it now
and it STILL does not burn any oil.



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

This I don't get. Piston slap indicates excessive wear. How can this be
normal and how can it not lead to serious engine damage? I really like Art's
idea of cranking up a couple that are sitting on the lot. Anyhow, my
question is serious. I have owned a number of Toyotas and MANY other cars
over the years and never had this symptom without an underlying cause that
was indicative of worn engine components. Thanks.
jor
>
> It's the famous I-Force piston slap and it is perfectly normal.
> It's worst on cold mornings (sounds like a Duramax), even if it's only
> been sitting overnight.
> My '03 Tundra has done it from day-1, and I have over 105k on it now
> and it STILL does not burn any oil.
>

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

"jor" <jor@jor.com> wrote in message
news:vvCdnZ7ytNXp57nfRVn-jg@giganews.com...
> This I don't get. Piston slap indicates excessive wear. How can this be
> normal and how can it not lead to serious engine damage? I really like
> Art's idea of cranking up a couple that are sitting on the lot. Anyhow, my
> question is serious. I have owned a number of Toyotas and MANY other cars
> over the years and never had this symptom without an underlying cause that
> was indicative of worn engine components. Thanks.
> jor
>>

Art's suggestion of trying out other vehicles in the lot is a good one that
I used to use to show customers that a condition is normal. I have noticed
the sound occasionally on our '03 Sequoia, although it rarely goes more than
12 hours without being started so I rarely hear the sound.

Toyota has had piston slap sounds at startup in the past without any
longevity issues. The 22-R engine comes to mind.


>> It's the famous I-Force piston slap and it is perfectly normal.
>> It's worst on cold mornings (sounds like a Duramax), even if it's only
>> been sitting overnight.
>> My '03 Tundra has done it from day-1, and I have over 105k on it now
>> and it STILL does not burn any oil.
>>
>
>> --- Rich
>> http://richlockyer.tripod.com/
>>>
>

--
Ray O
correct the return address punctuation to reply

New engine design is not what it was 15 years ago.
Consumers demand power.
EPA demands low emissions.

These dictate a very narrow band between the piston top and the top
ring, as well as a significant reduction in the length of the skirt.

This contributes to slap when cold.

The good thing is, the I-Force pistons are a ceramic type (I don't
recall the technical name) that are actually stronger than traditional
forged engines.



On Tue, 1 Mar 2005 07:22:11 -0700, "jor" <jor@jor.com> wrote:

>This I don't get. Piston slap indicates excessive wear. How can this be
>normal and how can it not lead to serious engine damage? I really like Art's
>idea of cranking up a couple that are sitting on the lot. Anyhow, my
>question is serious. I have owned a number of Toyotas and MANY other cars
>over the years and never had this symptom without an underlying cause that
>was indicative of worn engine components. Thanks.
>jor
>>
>> It's the famous I-Force piston slap and it is perfectly normal.
>> It's worst on cold mornings (sounds like a Duramax), even if it's only
>> been sitting overnight.
>> My '03 Tundra has done it from day-1, and I have over 105k on it now
>> and it STILL does not burn any oil.
>>
>
>> --- Rich
>> http://richlockyer.tripod.com/
>>>
>


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

Production engines have almost never ever used forged aluminum pistons.
Cast all the way. This includes very high rpm motorcycle engine. the
reason is expansion control provisions can be cast into a cast piston.
Ceramic pistons are still aluminum but a higher silicon content. The skirt
is etched about .005" leaving only the "glass". The missing alumunum is
then replaced with composite metals or even plastics and finished to size.
--

- Philip

Rich Lockyer wrote:
> New engine design is not what it was 15 years ago.
> Consumers demand power.
> EPA demands low emissions.
>
> These dictate a very narrow band between the piston top and the top
> ring, as well as a significant reduction in the length of the skirt.
>
> This contributes to slap when cold.
>
> The good thing is, the I-Force pistons are a ceramic type (I don't
> recall the technical name) that are actually stronger than traditional
> forged engines.
>
>
>
> On Tue, 1 Mar 2005 07:22:11 -0700, "jor" <jor@jor.com> wrote:
>
>> This I don't get. Piston slap indicates excessive wear. How can this
>> be normal and how can it not lead to serious engine damage? I really
>> like Art's idea of cranking up a couple that are sitting on the lot.
>> Anyhow, my question is serious. I have owned a number of Toyotas and
>> MANY other cars over the years and never had this symptom without an
>> underlying cause that was indicative of worn engine components.
>> Thanks.
>> jor
>>>
>>> It's the famous I-Force piston slap and it is perfectly normal.
>>> It's worst on cold mornings (sounds like a Duramax), even if it's
>>> only been sitting overnight.
>>> My '03 Tundra has done it from day-1, and I have over 105k on it now
>>> and it STILL does not burn any oil.
>>>
>>
>>> --- Rich
>>> http://richlockyer.tripod.com/

sg wrote:
>
> My new Sequoia with less than 4k miles sat for 3 days and at start up
> knocked loudly for 4-5 seconds before quieting down. The temp in the garage
> over those 3 days was between 35 and 55 degrees f. The oil had been changed
> by the dealership at 2,500 miles. I like an early change with a new car.
> The knocking was so loud it seemed loud with the windows closed. The dealer
> said this is "normal" when the vehicle is not driven for 3 days. I have
> never had this exeperience before with cars I left for as much as a week or
> two undriven.
>
> Is it normal?

I think it must be common. Last fall I was shopping for a
Tundra. Three out of three that I test drove made a knocking
sound when they were first started. Don't feel like Toyota
is alone in this. I have a Ford Expedition that behaves in
exactly the same way as you described for your Sequoia. The
truck has 70,000 miles, has never used any oil, and runs
just fine.

Ed

My new Sequoia with less than 4k miles sat for 3 days and at start up
knocked loudly for 4-5 seconds before quieting down. The temp in the garage
over those 3 days was between 35 and 55 degrees f. The oil had been changed
by the dealership at 2,500 miles. I like an early change with a new car.
The knocking was so loud it seemed loud with the windows closed. The dealer
said this is "normal" when the vehicle is not driven for 3 days. I have
never had this exeperience before with cars I left for as much as a week or
two undriven.

Is it normal?

It happens with some engine designs. The engine oil runs down and there is
not much lubrication for a few moments. Also a bad oil filter backflow
valve can possibly contribute. Also make sure they have enuf oil in the
engine.



"sg" <spgmkg@earthlink.net> wrote in message
news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> My new Sequoia with less than 4k miles sat for 3 days and at start up
> knocked loudly for 4-5 seconds before quieting down. The temp in the
> garage
> over those 3 days was between 35 and 55 degrees f. The oil had been
> changed
> by the dealership at 2,500 miles. I like an early change with a new car.
> The knocking was so loud it seemed loud with the windows closed. The
> dealer
> said this is "normal" when the vehicle is not driven for 3 days. I have
> never had this exeperience before with cars I left for as much as a week
> or
> two undriven.
>
> Is it normal?
>
>

I can't believe a loud knocking could ever be described as normal. If it
really is a knock (rod or main bearing) that could be quite serious,
certainly not acceptable in a newer vehicle. It sounds as though the oil
pressure is not normal for some reason. I am assuming you checked the oil
level. If it does it again I think you need to return it to the dealer and
demand an explanation.
jor
"sg" <spgmkg@earthlink.net> wrote in message
news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> My new Sequoia with less than 4k miles sat for 3 days and at start up
> knocked loudly for 4-5 seconds before quieting down. The temp in the
> garage
> over those 3 days was between 35 and 55 degrees f. The oil had been
> changed
> by the dealership at 2,500 miles. I like an early change with a new car.
> The knocking was so loud it seemed loud with the windows closed. The
> dealer
> said this is "normal" when the vehicle is not driven for 3 days. I have
> never had this exeperience before with cars I left for as much as a week
> or
> two undriven.
>
> Is it normal?
>
>

Thanks for the reply. Oil level looks good. Filter is genuine toyota I have
to believe, since the dealer did the oil change. I was afraid that I am
being handed a line of BS to avoid dealing with the problem, if there is
one. This really effects my confidence in the dealer.
sg

"jor" <jor@jor.com> wrote in message
news:iMudnUbs-rxGLb7fRVn-tA@giganews.com...
> I can't believe a loud knocking could ever be described as normal. If it
> really is a knock (rod or main bearing) that could be quite serious,
> certainly not acceptable in a newer vehicle. It sounds as though the oil
> pressure is not normal for some reason. I am assuming you checked the oil
> level. If it does it again I think you need to return it to the dealer and
> demand an explanation.
> jor
> "sg" <spgmkg@earthlink.net> wrote in message
> news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
> > My new Sequoia with less than 4k miles sat for 3 days and at start up
> > knocked loudly for 4-5 seconds before quieting down. The temp in the
> > garage
> > over those 3 days was between 35 and 55 degrees f. The oil had been
> > changed
> > by the dealership at 2,500 miles. I like an early change with a new
car.
> > The knocking was so loud it seemed loud with the windows closed. The
> > dealer
> > said this is "normal" when the vehicle is not driven for 3 days. I have
> > never had this exeperience before with cars I left for as much as a week
> > or
> > two undriven.
> >
> > Is it normal?
> >
> >
>
>

You should be able to test his theory by going out on the lot and cranking
up a couple of new trucks that have been sitting there for a week unsold.



"sg" <spgmkg@earthlink.net> wrote in message
news:KwOUd.7933$MY6.3520@newsread1.news.pas.earthl ink.net...
> Thanks for the reply. Oil level looks good. Filter is genuine toyota I
> have
> to believe, since the dealer did the oil change. I was afraid that I am
> being handed a line of BS to avoid dealing with the problem, if there is
> one. This really effects my confidence in the dealer.
> sg
>
> "jor" <jor@jor.com> wrote in message
> news:iMudnUbs-rxGLb7fRVn-tA@giganews.com...
>> I can't believe a loud knocking could ever be described as normal. If it
>> really is a knock (rod or main bearing) that could be quite serious,
>> certainly not acceptable in a newer vehicle. It sounds as though the oil
>> pressure is not normal for some reason. I am assuming you checked the oil
>> level. If it does it again I think you need to return it to the dealer
>> and
>> demand an explanation.
>> jor
>> "sg" <spgmkg@earthlink.net> wrote in message
>> news:loIUd.161$L17.126@newsread3.news.pas.earthlin k.net...
>> > My new Sequoia with less than 4k miles sat for 3 days and at start up
>> > knocked loudly for 4-5 seconds before quieting down. The temp in the
>> > garage
>> > over those 3 days was between 35 and 55 degrees f. The oil had been
>> > changed
>> > by the dealership at 2,500 miles. I like an early change with a new
> car.
>> > The knocking was so loud it seemed loud with the windows closed. The
>> > dealer
>> > said this is "normal" when the vehicle is not driven for 3 days. I
>> > have
>> > never had this exeperience before with cars I left for as much as a
>> > week
>> > or
>> > two undriven.
>> >
>> > Is it normal?
>> >
>> >
>>
>>
>
>