91 with no PVC

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Old 03 May 2006, 06:54 am   #1 (permalink)
m Ransley
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Default 91 with no PVC

A 91 4 cil Camry has no pvc valve from what I have read, what is there
to maintain to keep the gas recirculation clean and operating properly.

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Old 03 May 2006, 09:00 am   #2 (permalink)
Daniel
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Default Re: 91 with no PVC

PVC is poly vinyl chloride - a white plastic commonly found in
sprinkler lines.

Perhaps you mean "positive crankcase ventilation" or "PCV"

I'm quite sure your '91 has got one. The predecessor was road draft
tubes, where the blowby was vented to atmosphere. If you look you
should see a black tube apx. 1/2" diameter coming off the valve cover
and leading to the intake.

My '77 Toyota truck has one, so they've been around a while.

The PCV valve will be at the base of that tube leading from the top of
the valve cover. You won't really see it until you pull it out. Be
forewarned though, on mine, the gasket was really brittle, and the
valve was hard to remove. When I later replaced the valve cover gasket
and had the valve cover removed, I turned it upside down to replace the
PCV valve grommet - the brittle pieces that broke off then fell to the
floor instead of inside the vapor separation baffle at the top of the
inside of the valve cover.

I think the basic test for a PCV valve is simply shake it and if it
rattles, it's OK, but they're cheap enough to replace with new while
you're there.

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Old 03 May 2006, 11:50 am   #3 (permalink)
Jason James
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Default Re: 91 with no PVC


"Daniel" <nospampls2002@yahoo.com> wrote in message
news:1146664807.859008.112490@u72g2000cwu.googlegr oups.com...
> PVC is poly vinyl chloride - a white plastic commonly found in
> sprinkler lines.
>
> Perhaps you mean "positive crankcase ventilation" or "PCV"
>
> I'm quite sure your '91 has got one. The predecessor was road draft
> tubes, where the blowby was vented to atmosphere. If you look you
> should see a black tube apx. 1/2" diameter coming off the valve cover
> and leading to the intake.
>
> My '77 Toyota truck has one, so they've been around a while.
>
> The PCV valve will be at the base of that tube leading from the top of
> the valve cover. You won't really see it until you pull it out. Be
> forewarned though, on mine, the gasket was really brittle, and the
> valve was hard to remove. When I later replaced the valve cover gasket
> and had the valve cover removed, I turned it upside down to replace the
> PCV valve grommet - the brittle pieces that broke off then fell to the
> floor instead of inside the vapor separation baffle at the top of the
> inside of the valve cover.
>
> I think the basic test for a PCV valve is simply shake it and if it
> rattles, it's OK, but they're cheap enough to replace with new while
> you're there.


A poorly sealing PCV valve can cause a host of problems, including too lean
a mixture on starting (providing the car is "open" loop on starting), robs
brake vacuum resevoir of vacuum-top up durimg slow moving traffic and if it
gets bad enough, engine snuffs while idling.

In a Ford I own, the PCV valve caused havoc until I replaced it for about
$10.

Jason


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Old 03 May 2006, 12:29 pm   #4 (permalink)
m Ransley
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Default Re: 91 with no PVC

Well the manual doesnt mention a PCV , the hose on the valve cover going
to the intake has none, it is an opening unobstructed that goes into the
valve train the hose slides onto, so I guess it really has no PCV?

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Old 03 May 2006, 02:57 pm   #5 (permalink)
Andy Hill
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Default Re: 91 with no PVC

ransley@webtv.net (m Ransley) wrote:
>Well the manual doesnt mention a PCV , the hose on the valve cover going
>to the intake has none, it is an opening unobstructed that goes into the
>valve train the hose slides onto, so I guess it really has no PCV?
>

Are you the original owner? I'm not that familiar with the Gen2 Camrys, but it
sounds to me like somebody yanked the PCV valve and just did a direct-connect
into the valve cover. That can't be good...
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Old 03 May 2006, 03:15 pm   #6 (permalink)
Andy Hill
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Default Re: 91 with no PVC

ransley@webtv.net (m Ransley) wrote:
>Well the manual doesnt mention a PCV , the hose on the valve cover going
>to the intake has none, it is an opening unobstructed that goes into the
>valve train the hose slides onto, so I guess it really has no PCV?
>

Following up on my original post, if the engine in the '91 is anything like the
4-bangers in the Gen3 Camrys, there are *two* hoses going to the valve cover
from the air intake -- one has a PCV valve, one is a straight shot.
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Old 04 May 2006, 02:21 am   #7 (permalink)
Jason James
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Default Re: 91 with no PVC


"Andy Hill" <andy_hill@hp.com> wrote in message
news:al3i52tdf88h527jnlabe8m3cq8grfonp3@4ax.com...
> ransley@webtv.net (m Ransley) wrote:
> >Well the manual doesnt mention a PCV , the hose on the valve cover going
> >to the intake has none, it is an opening unobstructed that goes into the
> >valve train the hose slides onto, so I guess it really has no PCV?
> >

> Following up on my original post, if the engine in the '91 is anything

like the
> 4-bangers in the Gen3 Camrys, there are *two* hoses going to the valve

cover
> from the air intake -- one has a PCV valve, one is a straight shot.


That's correct, but the thumbprints of 3sfes on Google image search,..look
like one line. Too hard to see if there's a PCV in it,..but if it did have
no valve, the direct line would go on the atmosphere side of the
throttle,..or aircleaner side.

Jason


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Old 04 May 2006, 02:32 am   #8 (permalink)
bauz
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Default Re: 91 with no PVC

There is PCV system but there is no PCV valve on the 3SFE engine, according
to Chilton. The diagram shows a simple hose from the front of the valve
cover to the intake. Recommended maintenance is to "clean the line with
combustion chamber conditioner", although I have never done it myself.

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Old 04 May 2006, 07:09 am   #9 (permalink)
m Ransley
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Default Re: 91 with no PVC

The hose does go into the intake at the throttle body, not before the
air filter.

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Old 04 May 2006, 08:00 am   #10 (permalink)
m Ransley
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Default Re: 91 with no PVC

I pulled the hose from the valve cover to intake, the fittings have no
valve in them as a screwdriver went in easily, but what is strange is
the hose is perfectly clean inside, no oil residue, I find that hard to
believe as the car has 105000m on it, I wonder if it is not pulling
through engine air for some reason.

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