vacuum switching valve

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Old 15 Sep 2008, 05:14 pm   #1 (permalink)
mrdarrett@gmail.com
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Default vacuum switching valve

What are potential symptoms of a defective vacuum switching valve (for
the EGR system)?

Does the VSV go bad on the '96 I4 camry, typically?

Michael
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Old 17 Sep 2008, 11:21 am   #2 (permalink)
MarvinShos via CarKB.com
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Default Re: vacuum switching valve

mrdarrett@gmail.com wrote:
>What are potential symptoms of a defective vacuum switching valve (for
>the EGR system)?
>
>Does the VSV go bad on the '96 I4 camry, typically?
>
>Michael

---------------------------------------------

If the VSV is not working (venting the manifold vacuum) the EGR valve will
always be controlled by the manifold vacuum. On this occasion may cause a
stumble if in fact the VSV should be venting the manifold vacuum. Try
disconnecting the vacuum line to the top of the EGR valve and blocking the
open end of the vacuum line removed. The EGR valve will now be closed. If the
symptoms you are experiencing change your VSV may be defective.

--
Marvin

Tomorrow's good old days are today!

Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx...camry/200809/1

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Old 17 Sep 2008, 12:12 pm   #3 (permalink)
mrdarrett@gmail.com
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Default Re: vacuum switching valve

On Sep 17, 9:21 am, "MarvinShos via CarKB.com" <u35633@uwe> wrote:
> mrdarr...@gmail.com wrote:
> >What are potential symptoms of a defective vacuum switching valve (for
> >the EGR system)?

>
> >Does the VSV go bad on the '96 I4 camry, typically?

>
> >Michael

>
> ---------------------------------------------
>
> If the VSV is not working (venting the manifold vacuum) the EGR valve will
> always be controlled by the manifold vacuum. On this occasion may cause a
> stumble if in fact the VSV should be venting the manifold vacuum. Try
> disconnecting the vacuum line to the top of the EGR valve and blocking the
> open end of the vacuum line removed. The EGR valve will now be closed. If the
> symptoms you are experiencing change your VSV may be defective.
>
> --
> Marvin
>
> Tomorrow's good old days are today!
>
> Message posted via CarKB.comhttp://www.carkb.com/Uwe/Forums.aspx/toyota-camry/200809/1




To access the VSV (California) do I have to remove the intake
manifold?

Thanks,

Michael
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Old 19 Sep 2008, 07:14 pm   #4 (permalink)
johngdole@hotmail.com
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Default Re: vacuum switching valve

The most problematic VSV is the evap one on the filter housing. Then
the carbon canister one. The EGR VSV much less problematic. It
basically turns off the egr valve at cold or idle so the vacuum
doesn't act on the valve.

You can follow the vacuum hose from the modulator down the firewall
side of the engine, somewhere between the intake plenum and rear
engine mount.

Are you having problems with EGR?



On Sep 15, 3:14*pm, mrdarr...@gmail.com wrote:
> What are potential symptoms of a defective vacuum switching valve (for
> the EGR system)?
>
> Does the VSV go bad on the '96 I4 camry, typically?
>
> Michael


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Old 20 Sep 2008, 12:11 pm   #5 (permalink)
mrdarrett@gmail.com
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Default Re: vacuum switching valve

On Sep 19, 5:14 pm, johngd...@hotmail.com wrote:
> The most problematic VSV is the evap one on the filter housing. Then
> the carbon canister one.



What are the symptoms of those failing?


> The EGR VSV much less problematic. It
> basically turns off the egr valve at cold or idle so the vacuum
> doesn't act on the valve.
>
> You can follow the vacuum hose from the modulator down the firewall
> side of the engine, somewhere between the intake plenum and rear
> engine mount.
>
> Are you having problems with EGR?



Looks like it. Stalls every now and then when coming to a stop (maybe
once a month now). I thought I had fixed it by replacing my EGR
modulator - no stalls for about a year after that.

Putting a nail in the EGR valve put a stop to it when it stalled
nearly every day (~ 1 year ago).

I'm suspecting a bad VSV or a leaky hose. I already cleaned out the
EGR valve with solvent last year

Michael
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Old 21 Sep 2008, 08:20 am   #6 (permalink)
mred
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Default Re: vacuum switching valve

On Sep 19, 8:14*pm, johngd...@hotmail.com wrote:
> The most problematic VSV is the evap one on the filter housing. Then
> the carbon canister one. The EGR VSV much less problematic. It
> basically turns off the egr valve at cold or idle so the vacuum
> doesn't act on the valve.
>
> You can follow the vacuum hose from the modulator down the firewall
> side of the engine, somewhere between the intake plenum and rear
> engine mount.
>
> Are you having problems with EGR?
>
> On Sep 15, 3:14*pm, mrdarr...@gmail.com wrote:
>
>
>
> > What are potential symptoms of a defective vacuum switching valve (for
> > the EGR system)?

>
> > Does the VSV go bad on the '96 I4 camry, typically?

>
> > Michael- Hide quoted text -

>
> - Show quoted text -


If its the carbon canister one there will be no indication except an
engine fault light comes on.

The car runs just as smooth as before the fault.BUT? you need to get
it fixed before your next emissions test.
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