1995 Camry V6 Throttle Opener

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Old 09 Dec 2006, 12:46 am   #1 (permalink)
bensteadev@comcast.net
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Default 1995 Camry V6 Throttle Opener

Does anyone know what the "throttle opener" on a 1995 Camry V6
automatic transmission 1MZFE engine does or how it works?

What I can see:

There is a vacuum diaphragm located underneath the throttle position
sensor. The diaphragm is connected via a vacuum line to the throttle
body. The diaphragm has a little piston sticking out f it. As the
piston retracts, there is a contacting arm along the outer diameter of
the throttle position sensor housing that, I guess, should turn. This
arm seems to link via a shaft through the throttle body itself, and
connects over to the other side, into the linkage where the throttle
cable and shifter cable are attached.

I can't find anything on this in Haynes.

The thing I find odd, is that the contacting arm doesn't seem to turn a
whole lot. The piston in the diaphragm will retract, and you'd think
the contacting arm would follow it, but the arm travels about 1/8" or
less and just stops. The piston in the diaphragm just keeps on
retracting...

Is this normal behavior?

Thank you

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Old 09 Dec 2006, 04:23 am   #2 (permalink)
toyomoho
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Default Re: 1995 Camry V6 Throttle Opener


The throttle opener is an emissions item. When the throttle is closed,
the opener rod prevents the throttle from fully closing for a brief
period of time. This allows additional air to completely burn the
mixture reducing NC and CO emissions.

Testing. Engine at idle and warm. Idle speed 700rpm +/-. Disconnect
and plug the end of vacuum hose. Idle should be at 900-1950rpm. Stop
the engine and reconnect hose. Start engine, idle speed should be back
to normal. If not, replace the opener.


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Old 09 Dec 2006, 11:17 am   #3 (permalink)
Daniel
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Default Re: 1995 Camry V6 Throttle Opener

bensteadev@comcast.net wrote:
> Does anyone know what the "throttle opener" on a 1995 Camry V6
> automatic transmission 1MZFE engine does or how it works?


> I can't find anything on this in Haynes.
>

==================
The Factory Service Manual includes an adjustment procedure for the
"throttle opener" in the section on removing, replacing, cleaning and
adjusting items associated with the throttle body.
For the 1994 5S-FE engine, when I removed the throttle body, and
replaced the IAC valve, I followed all the procedures for cleaning and
adjusting. The TPS needed to be adjusted, the orofices for the EGR
vacuum modulator lines needed to be cleaned and the throttle opener
position needed to be adjusted.
Basically everything they said to do needed doing.
See:
http://www.turboninjas.com/camry/
Engine section under Fuel

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Old 09 Dec 2006, 11:28 am   #4 (permalink)
bensteadev@comcast.net
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Default Re: 1995 Camry V6 Throttle Opener

Nice link, thank you!

When you pulled the IAC valve... did you have to re-set the throttle
opener and re-set the TPS because it was necessary after pulling the
throttle body (in other words, when you pull the throttle body, do you
lose the settings)?

Or did you do it just to be thorough?

I was thinking of replacing the IAC valve, and it would be unfortunate
if I were to pull the throttle body and lose a bunch of settings in the
process.

Thank you

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Old 09 Dec 2006, 11:45 am   #5 (permalink)
johngdole@hotmail.com
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Default Re: 1995 Camry V6 Throttle Opener

Toyota put that opener in there after the problem with the throttle
body cooling down and grabbing the throttle plate. And when people try
to start up the car and wonder why they can't open the throttle.

The screw is adjusted so it opens the throttle sufficiently when the
engine is off and doesn't interfere with anything when the engine is
running.



bensteadev@comcast.net wrote:
> Does anyone know what the "throttle opener" on a 1995 Camry V6
> automatic transmission 1MZFE engine does or how it works?
>
> What I can see:
>
> There is a vacuum diaphragm located underneath the throttle position
> sensor. The diaphragm is connected via a vacuum line to the throttle
> body. The diaphragm has a little piston sticking out f it. As the
> piston retracts, there is a contacting arm along the outer diameter of
> the throttle position sensor housing that, I guess, should turn. This
> arm seems to link via a shaft through the throttle body itself, and
> connects over to the other side, into the linkage where the throttle
> cable and shifter cable are attached.
>
> I can't find anything on this in Haynes.
>
> The thing I find odd, is that the contacting arm doesn't seem to turn a
> whole lot. The piston in the diaphragm will retract, and you'd think
> the contacting arm would follow it, but the arm travels about 1/8" or
> less and just stops. The piston in the diaphragm just keeps on
> retracting...
>
> Is this normal behavior?
>
> Thank you


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Old 10 Dec 2006, 09:02 am   #6 (permalink)
Daniel
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Default Re: 1995 Camry V6 Throttle Opener

bensteadev@comcast.net wrote:
> Nice link, thank you!
>
> When you pulled the IAC valve... did you have to re-set the throttle
> opener and re-set the TPS because it was necessary after pulling the
> throttle body (in other words, when you pull the throttle body, do you
> lose the settings)?
>
> Or did you do it just to be thorough?
>
> I was thinking of replacing the IAC valve, and it would be unfortunate
> if I were to pull the throttle body and lose a bunch of settings in the
> process.

================================================
I did it just to be thorough.
When I work on the car, I use the Factory Service Manual and follow
each step.
I do not believe removing the IAC valve had any effect - it is on the
bottom of the throttle body and not really attached in a way that would
affect anything else.
For example, the TPS is adjusted with a continuity tester and a
thickness gauge such that the continuity breaks off idle at something
like .002" and mine was something like .004".
A bit of dark colored goop sprouted out of one of the throttle body
ferrules after applying carburetor cleaner and compressed air to the
disassembled throttle body at the smallest of three openings in the
top.
And the throttle opener needed to have the plunger adjusted also. I
don't remember the procedure any longer, but I do remember tightening
the tiny locknut on the plunger, checking the adjustment, and then re
setting it several times before finally ending up with the correct
setting. I seem to remember looking at the tachometer as well. I think
it was raise the rpms to 1500, release the throttle and then check the
adjustment, but the book will tell you the exact procedure.
I seemed to notice the throttle responding more smoothly afterward.
Earlier, I had also adjusted the throttle cable by holding the pedal to
the floor with a weight, and removing excess slack from the cable at
WOT.

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Old 10 Dec 2006, 03:37 pm   #7 (permalink)
johngdole@hotmail.com
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Default Re: 1995 Camry V6 Throttle Opener

You don't have to reset anything if you pull the IAC valve, it's
independent of TPS and throttle opener.

The notorious IAC valve, if need to be cleaned do not have to be
replaced each time. Daniel uses Triflow spray after cleaning to keep it
working, do a search on the post.

You will have to pull the throttle body to be able to work on the IAC
more easily. Just don't spray throttle body cleaner into TPS or into
the IAC's electrical side. Most cleaners attack rubbers and might cause
seal problems.


bensteadev@comcast.net wrote:
> Nice link, thank you!
>
> When you pulled the IAC valve... did you have to re-set the throttle
> opener and re-set the TPS because it was necessary after pulling the
> throttle body (in other words, when you pull the throttle body, do you
> lose the settings)?
>
> Or did you do it just to be thorough?
>
> I was thinking of replacing the IAC valve, and it would be unfortunate
> if I were to pull the throttle body and lose a bunch of settings in the
> process.
>
> Thank you


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