Toyota Detonating

Hi all,
I need some input on a problem, I have a 2000 Tacoma Pre-runner x-tra cab
v-6 , with all options. I bought it new six years ago here in Phoenix. It
has been a great , trouble free truck. The truck now has 64,000 miles I
have always done most of the service myself. It gets oil and filter every
5000, trans serv every 15000 and plugs every 35000. And air and fuel
filter every 20000 and I get all of my parts at the dealer. Yesterday
morning I had an appointment downtown. When I entered the expressway to
come home I accelerated up to 60 or so . I went under a bridge and started
up a slight incline and the engine started to detonate really hard, I let
up on the throttle and the noise went away. As sonn as i touched the
throttle again the rattle started again. The truck has never done anything
like this before. I took it to my dealer. They check timing and it was
perfect. I had the timing belt changeed there 4000 miles ago. He says
carbon build-up in cylinders, I'm skeptical. I have always used name brand
fuel like Chevron, Texaco or Shell. But the last few tanks I bought at
Costco because they were a little cheaper. Has anyone ever had a carbon
problem that was cured by the dealers $139.00 de-carbon treatment. I am
going to run this fuel out and go back to a name brand station. I would
appreciate any input on this.
Scott

On Fri, 12 May 2006 19:43:58 -0400, "zonie" <sjemoomaw@nospam> wrote:
[color=blue]
>Has anyone ever had a carbon
>problem that was cured by the dealers $139.00 de-carbon treatment. I am
>going to run this fuel out and go back to a name brand station. I would
>appreciate any input on this.[/color]

If it's relatively drivable, I'd run out the tank and try some
Techron, or fuel containing same (Chevron? Shell?).

Are you sure it was detonating, or was it simply bucking and losing
power. If it's the latter, you may have simply picked up a bad load
of gas and clogged the fuel filter.

On Fri, 12 May 2006 23:53:22 GMT, Bonehenge
<DwightSchrute@DunderMifflin.com> wrote:
[color=blue]
>On Fri, 12 May 2006 19:43:58 -0400, "zonie" <sjemoomaw@nospam> wrote:
>[color=green]
>>Has anyone ever had a carbon
>>problem that was cured by the dealers $139.00 de-carbon treatment. I am
>>going to run this fuel out and go back to a name brand station. I would
>>appreciate any input on this.[/color]
>
>If it's relatively drivable, I'd run out the tank and try some
>Techron, or fuel containing same (Chevron? Shell?).
>
>Are you sure it was detonating, or was it simply bucking and losing
>power. If it's the latter, you may have simply picked up a bad load
>of gas and clogged the fuel filter.
>
>[/color]


Or that it has lost its tolerance for 87 octane fuel whch is realy too
low to begin with for most modern engines. Octane requirement is not
constant and it increases with tempature and load. You might check to
see if it has a kcock sensor that has failed (a lot of vehicle have
one and retard spark (and performance and MPG too) when it hears a
knock before you hear it
-----------------
The SnoMan
[url]www.thesnoman.com[/url]

Thanks for the input Dwight . It is definitly detonating, sounds awful. I
am going to run this tank out and try some different fuel. It has just
turned hot here in Phoenix (over 100) but the truck has always lived here
and has never done this before. I did some checking and found the knock
sensors are under the intake manifold , the dealer says if they were bad
the check engine light would be on. When I put the different fuel in I
will report on what takes place.
Scott

"Bonehenge" <DwightSchrute@DunderMifflin.com> wrote in message
news:eq7a625mg0hmbed04s7qcbejsr3ilabb87@4ax.com...[color=blue]
> On Fri, 12 May 2006 19:43:58 -0400, "zonie" <sjemoomaw@nospam> wrote:
>[color=green]
>>Has anyone ever had a carbon
>>problem that was cured by the dealers $139.00 de-carbon treatment. I am
>>going to run this fuel out and go back to a name brand station. I would
>>appreciate any input on this.[/color]
>
> If it's relatively drivable, I'd run out the tank and try some
> Techron, or fuel containing same (Chevron? Shell?).
>
> Are you sure it was detonating, or was it simply bucking and losing
> power. If it's the latter, you may have simply picked up a bad load
> of gas and clogged the fuel filter.
>
>[/color]

Even if it's detonating, he could have picked up a bad load of fuel.

"zonie" <sjemoomaw@nospam> wrote in message
news:f2000fc318639301a240d495d023a883@localhost.talkaboutautos.com...[color=blue]
> Thanks for the input Dwight . It is definitly detonating, sounds awful. I
> am going to run this tank out and try some different fuel. It has just
> turned hot here in Phoenix (over 100) but the truck has always lived here
> and has never done this before. I did some checking and found the knock
> sensors are under the intake manifold , the dealer says if they were bad
> the check engine light would be on. When I put the different fuel in I
> will report on what takes place.
> Scott
>[/color]

You can also try octane booster. Or, let the tank drop to about the half way
mark, and top it off with premium, then go back to the regular when that is
gone.

On Sat, 13 May 2006 16:17:38 -0700, "Jeff Strickland"
<crwlr@yahoo.com> wrote:
[color=blue]
>You can also try octane booster. Or, let the tank drop to about the half way
>mark, and top it off with premium, then go back to the regular when that is
>gone.[/color]


Cheaper to use better gas than octane booster
-----------------
The SnoMan
[url]www.thesnoman.com[/url]

"SnoMan" <admin@snoman.com> wrote in message
news:6buc621i7e62c9c6q9tu3qqi1p99u0cdoq@4ax.com...[color=blue]
> On Sat, 13 May 2006 16:17:38 -0700, "Jeff Strickland"
> <crwlr@yahoo.com> wrote:
>[color=green]
>>You can also try octane booster. Or, let the tank drop to about the half
>>way
>>mark, and top it off with premium, then go back to the regular when that
>>is
>>gone.[/color]
>
>
> Cheaper to use better gas than octane booster[/color]

In the long run, that is definitely true.

But, he bought a load of crappy gas and needs to recover. Obviously, he
thought he was buying good gas -- he went to Costco -- but you need to
understand he is in Arizona, and they can get gas from pretty much anywhere.
I have never bought bad gas, except once when I was in Arizona. I'm not
suggesting that all gas in Arizona is bad, I'm only suggesting that the odds
that he got a load of bad gas is within the bounds of reason. Octane booster
is among the recovery options. It's also a valid test. If the octane booster
makes the problem go away, then he can be reasonably sure there is no
problem with his truck.




[color=blue]
> -----------------
> The SnoMan
> [url]www.thesnoman.com[/url][/color]

You might want to try some Chevron injector cleaner and some Auto Rx.
which is available at autorx.com.
That should clean up any carbon build up.
Good Luck...
°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°°

AS IN LIFE, IT'S THE JOURNEY, NOT THE DESTINATION THAT'S IMPORTANT.

zonie wrote:[color=blue]
> Hi all,
> I need some input on a problem, I have a 2000 Tacoma Pre-runner x-tra cab
> v-6 , with all options. I bought it new six years ago here in Phoenix. It
> has been a great , trouble free truck. The truck now has 64,000 miles I
> have always done most of the service myself. It gets oil and filter every
> 5000, trans serv every 15000 and plugs every 35000. And air and fuel
> filter every 20000 and I get all of my parts at the dealer. Yesterday
> morning I had an appointment downtown. When I entered the expressway to
> come home I accelerated up to 60 or so . I went under a bridge and started
> up a slight incline and the engine started to detonate really hard, I let
> up on the throttle and the noise went away. As sonn as i touched the
> throttle again the rattle started again. The truck has never done anything
> like this before. I took it to my dealer. They check timing and it was
> perfect. I had the timing belt changeed there 4000 miles ago. He says
> carbon build-up in cylinders, I'm skeptical. I have always used name brand
> fuel like Chevron, Texaco or Shell. But the last few tanks I bought at
> Costco because they were a little cheaper. Has anyone ever had a carbon
> problem that was cured by the dealers $139.00 de-carbon treatment. I am
> going to run this fuel out and go back to a name brand station. I would
> appreciate any input on this.
> Scott
>
>[/color]
Carbon built up in the combustion chamber glows red hot and causes
ignition before the spark fires. If you have this, there are a few
combustion chamber cleaning products that work well. Try Chevron
Techron Concentrate, BG 44K, Red Line Fuel System Cleaner, or Seafoam.

"# I have seen the black bottle of Techron® Concentrate in Chevron
service stations. What is the difference between Techron® and
Techron® Concentrate?

"The principal difference between Techron® and Techron® Concentrate
is additive concentration and rate of deposit clean-up. At the
concentration present in Chevron gasolines, Techron® over many
tankfuls will help clean up deposits on intake valves without
contributing to combustion chamber deposits. So, over time, Chevron
gasolines with Techron® are able to reduce or eliminate
deposit-related hesitation and stumbling during acceleration caused
by deposits. A bottle of Techron® Concentrate, when added to
gasoline according to the label instructions, results in an additive
concentration roughly 10 times stronger than the dose in our
gasolines. This mega-dose of Techron® provides a much quicker clean
up of intake valve deposits left by lower quality gasolines. In
addition, the high concentration of Techron® reduces combustion
chamber deposits, which can help reduce or eliminate deposit-related
engine knock and run-on."

If you use the Seafoam in the process where you suck it slowly into
the engine through a vacuum hose, do it at night. It'll smoke like
mad, but it'll do a very good job.


Ken

On Sun, 14 May 2006 20:07:56 -0700, Ken Shelton
<shelton@cablespeed.com> wrote:
[color=blue]
>Carbon built up in the combustion chamber glows red hot and causes
>ignition before the spark fires.[/color]


Not exactlly. Will it can stay a little hot it is not red hot and the
carbon increases the effective CR of engine and make it more prone to
detenate with low octane fuel.
-----------------
The SnoMan
[url]www.thesnoman.com[/url]