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Old 12-29-2005, 10:01   #1 (permalink)
Backyard Mechanic
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Re: 1197 Ford Escort MPC valve

stevedhoward@gmail.com wrote:

> Hi All,
>
> I am a newbie struggling to learn to fix at least minor issues on our
> cars. Recently, our 1997 Ford Escort wagon (120K miles without major
> issue) has been idling roughly, and almost but never quite stalling at
> stoplights after the car is warmed up. After spending the last few
> weeks reading on the Internet and reading my Haynes manual, I worked up
> the courage to purchase an automotive stethoscope, as all my research
> seemed to point to a vacuum leak.
>
> As soon as I started the car and opened the hood, I saw, at least for
> this case, I didn't even need the stethoscope. I immediately heard a
> hissing sound when the hood was raised. I saw a small elbowed "valve"
> pointing into the manifold. The rubber just above where the valve
> actually attaches to the manifold was very squishy. It almost looked
> like it was soaked with oil (not a good sign, I guess?). The wearing
> on the rubber of this substance had worn holes on each side of it (the
> rubber), so that it was collapsing and I guess not allowing air into
> the manifold. As soon as I pulled up so air flowed freely, the engine
> ran fine. If I clamped it with my fingers, the engine stalled. It had
> "MPC" on it, so I looked that up, and tied that down to a "manifold
> pressure control". My Haynes manual does not reference this, and it
> looks like it is long tube that starts from the front of the engine and
> eventually goes into the manifold.
>
> My two questions are:
>
> 1) How do I replace this?
> 2) Is the substance that has soaked and worn down the rubber an omen
> of something terrible about to come my way? :(
>


MPC doesnt ring a bell.

Could it be the other end goes to the PCV valve? Or does it go to the
fuel rail?

Do you use a lot of oil?

Replace the tubing with oil/fuel resistant and the PCV valve while you're
at it, then drive it.

--
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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Old 12-29-2005, 10:01   #2 (permalink)
stevedhoward@gmail.com
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1197 Ford Escort MPC valve

Hi All,

I am a newbie struggling to learn to fix at least minor issues on our
cars. Recently, our 1997 Ford Escort wagon (120K miles without major
issue) has been idling roughly, and almost but never quite stalling at
stoplights after the car is warmed up. After spending the last few
weeks reading on the Internet and reading my Haynes manual, I worked up
the courage to purchase an automotive stethoscope, as all my research
seemed to point to a vacuum leak.

As soon as I started the car and opened the hood, I saw, at least for
this case, I didn't even need the stethoscope. I immediately heard a
hissing sound when the hood was raised. I saw a small elbowed "valve"
pointing into the manifold. The rubber just above where the valve
actually attaches to the manifold was very squishy. It almost looked
like it was soaked with oil (not a good sign, I guess?). The wearing
on the rubber of this substance had worn holes on each side of it (the
rubber), so that it was collapsing and I guess not allowing air into
the manifold. As soon as I pulled up so air flowed freely, the engine
ran fine. If I clamped it with my fingers, the engine stalled. It had
"MPC" on it, so I looked that up, and tied that down to a "manifold
pressure control". My Haynes manual does not reference this, and it
looks like it is long tube that starts from the front of the engine and
eventually goes into the manifold.

My two questions are:

1) How do I replace this?
2) Is the substance that has soaked and worn down the rubber an omen
of something terrible about to come my way? :(

Thanks!

Steve

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Old 12-29-2005, 10:01   #3 (permalink)
ShoeSaleman
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Posts: n/a
Re: 1197 Ford Escort MPC valve

stevedhoward@gmail.com wrote:
> Hi All,
>
> I am a newbie struggling to learn to fix at least minor issues on our
> cars. Recently, our 1997 Ford Escort wagon (120K miles without major
> issue) has been idling roughly, and almost but never quite stalling at
> stoplights after the car is warmed up. After spending the last few
> weeks reading on the Internet and reading my Haynes manual, I worked up
> the courage to purchase an automotive stethoscope, as all my research
> seemed to point to a vacuum leak.
>
> As soon as I started the car and opened the hood, I saw, at least for
> this case, I didn't even need the stethoscope. I immediately heard a
> hissing sound when the hood was raised. I saw a small elbowed "valve"
> pointing into the manifold. The rubber just above where the valve
> actually attaches to the manifold was very squishy. It almost looked
> like it was soaked with oil (not a good sign, I guess?). The wearing
> on the rubber of this substance had worn holes on each side of it (the
> rubber), so that it was collapsing and I guess not allowing air into
> the manifold. As soon as I pulled up so air flowed freely, the engine
> ran fine. If I clamped it with my fingers, the engine stalled. It had
> "MPC" on it, so I looked that up, and tied that down to a "manifold
> pressure control". My Haynes manual does not reference this, and it
> looks like it is long tube that starts from the front of the engine and
> eventually goes into the manifold.
>
> My two questions are:
>
> 1) How do I replace this?
> 2) Is the substance that has soaked and worn down the rubber an omen
> of something terrible about to come my way? :(
>
> Thanks!
>
> Steve
>

Take the hose to an auto parts store and get a new piece. You can buy it
by the foot. The substance that ruined the hose is oil, nothing to worry
about.
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Old 12-30-2005, 12:01   #4 (permalink)
stevedhoward@gmail.com
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Posts: n/a
Re: 1197 Ford Escort MPC valve

Thanks you each for your answers.

Backyard Mechanic,

Yes, it did go to the PCV valve. Thanks for the pointer, as that made
my Internet seach much easier! I don't use any oil, ironically, or at
least noticeably between changes.

ShoeSaleman,

I did exactly that (got a length of hose from Autozone), and I am good
to go.

Thanks to you both!!!

Steve

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