98 S10 Vacuum Issue

#1

I am trying to track down a possible vacuum issue. I have no HVAC
control and understand it is operated by vacuum.
I found what looks to be a vacuum line disconnected on the driver side
of the motor but can not find where it goes.
I bought this S10 ZR2 4X4 for short money and am just getting it ready
for the winter. It had a recent motor swap and I believe a few things
might have been re-connected. Also the 4X4 does not engage. Could this
be a vacuum issue also? Thanks

#2

HDManny wrote:

Quote:

I am trying to track down a possible vacuum issue. I have no HVAC
control and understand it is operated by vacuum.
I found what looks to be a vacuum line disconnected on the driver side
of the motor but can not find where it goes.
I bought this S10 ZR2 4X4 for short money and am just getting it ready
for the winter. It had a recent motor swap and I believe a few things
might have been re-connected. Also the 4X4 does not engage. Could this
be a vacuum issue also? Thanks

Yep, Same vacuum feed is used by both systems. The line on the 98 comes
from the engine to a T near the left hood hinge area. Then one line runs
up to the vacuum reservoir and the other feeds the control systems.

--
Steve W.
Near Cooperstown, New York

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#3

Quote:

Yep, Same vacuum feed is used by both systems. The line on the 98 comes
from the engine to a T near the left hood hinge area. Then one line runs
up to the vacuum reservoir and the other feeds the control systems.

--
Steve W.
Near Cooperstown, New York

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That does sound like the line I have that is dis-connected.
Can you tell me where exactly on the engine does it go.
I have looked all over the manifold and can not find the source.
The line only reaches around the rear quarter of the engine.

#4

HDManny wrote:

Quote:

Yep, Same vacuum feed is used by both systems. The line on the 98
comes from the engine to a T near the left hood hinge area. Then
one line runs up to the vacuum reservoir and the other feeds the
control systems.

-- Steve W. Near Cooperstown, New York

That does sound like the line I have that is dis-connected. Can you
tell me where exactly on the engine does it go. I have looked all
over the manifold and can not find the source. The line only reaches
around the rear quarter of the engine.

Look under the upper radiator hose on the left side of the engine next
to the throttle body plenum for a fitting that twists into the intake
manifold. The connection is there if this is a 96 or up engine. If you
cannot find one there any continuous manifold vacuum source will work.

--
Steve W.
Near Cooperstown, New York

Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your ass tomorrow!

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#5

On Oct 6, 11:10*am, "Steve W." <csr... (AT) yahoo (DOT) com> wrote:

Quote:

HDManny wrote:
Yep, Same vacuum feed is used by both systems. The line on the 98
comes from the engine to a T near the left hood hinge area. Then
one line runs up to the vacuum reservoir and the other feeds the
control systems.

-- Steve W. Near Cooperstown, New York

That does sound like the line I have that is dis-connected. Can you
tell me where exactly on the engine does it go. I have looked all
over the manifold and can not find the source. The line only reaches
around the rear quarter of the engine.

Look under the upper radiator hose on the left side of the engine next
to the throttle body plenum for a fitting that twists into the intake
manifold. The connection is there if this is a 96 or up engine. If you
cannot find one there any continuous manifold vacuum source will work.

--
Steve W.
Near Cooperstown, New York

Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your ass tomorrow!

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---= - Total Privacy via Encryption =---

I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would another vacuum source be?

#6

HDManny wrote:

Quote:

I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would another vacuum source be?

Sounds like it is a different year. In that event just about any
manifold vacuum source will work as long as it is below the throttle
body. Shouldn't be hard to find one.

--
Steve W.

#7

On Oct 7, 3:40*pm, "Steve W." <csr684... (AT) yahoo (DOT) com> wrote:

Quote:

HDManny wrote:
I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would another vacuum source be?

Sounds like it is a different year. In that event just about any
manifold vacuum source will work as long as it is below the throttle
body. Shouldn't be hard to find one.

--
Steve W.

This issue is getting a bit ridiculous. I took the truck to a local
mechanic. He couldn't find the vacuum source also.
He called Chevrolet for help. No luck there also. Finally he contacted
a customer with a similar vehile (99 S10 Blazer) that he is going to
examine today to find where the vacuum hose is coming from on that.
Hopefully it is the same.
This might seem unusual, But I'm getting used to the statement: "In
all my years doing this, I've never come across anything like this".

#8

On Oct 16, 11:57*am, HDManny <HDMa... (AT) gmail (DOT) com> wrote:

Quote:

On Oct 7, 3:40*pm, "Steve W." <csr684... (AT) yahoo (DOT) com> wrote:

HDManny wrote:
I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would anothervacuumsource be?

Sounds like it is a different year. In that event just about any
manifoldvacuumsource will work as long as it is below the throttle
body. Shouldn't be hard to find one.

--
Steve W.

This issue is getting a bit ridiculous. I took the truck to a local
mechanic. He couldn't find thevacuumsource also.
He called Chevrolet for help. No luck there also. Finally he contacted
a customer with a similar vehile (99 S10 Blazer) that he is going to
examine today to find where thevacuumhose is coming from on that.
Hopefully it is the same.
This might seem unusual, But I'm getting used to the statement: "In
all my years doing this, I've never come across anything like this".

OK All squared away finally. We found that the vacuum source is at the
plug from the PCV valve on the manifold. Aparently the plug used for
a 2WD vehicle is different than on a 4WD. I found a 4WD GMC at a
boneyard that has the port for the vacuum line and swapped it out.
Thanks

#9

HDManny wrote:

Quote:

On Oct 16, 11:57 am, HDManny <HDMa... (AT) gmail (DOT) com> wrote:
On Oct 7, 3:40 pm, "Steve W." <csr684... (AT) yahoo (DOT) com> wrote:

HDManny wrote:
I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would anothervacuumsource be?
Sounds like it is a different year. In that event just about any
manifoldvacuumsource will work as long as it is below the throttle
body. Shouldn't be hard to find one.
--
Steve W.
This issue is getting a bit ridiculous. I took the truck to a local
mechanic. He couldn't find thevacuumsource also.
He called Chevrolet for help. No luck there also. Finally he contacted
a customer with a similar vehile (99 S10 Blazer) that he is going to
examine today to find where thevacuumhose is coming from on that.
Hopefully it is the same.
This might seem unusual, But I'm getting used to the statement: "In
all my years doing this, I've never come across anything like this".

OK All squared away finally. We found that the vacuum source is at the
plug from the PCV valve on the manifold. Aparently the plug used for
a 2WD vehicle is different than on a 4WD. I found a 4WD GMC at a
boneyard that has the port for the vacuum line and swapped it out.
Thanks

Yep, different because of that extra nipple.

--
Steve W.

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#10

On Nov 8, 9:54*pm, "Steve W." <csr... (AT) yahoo (DOT) com> wrote:

Quote:

HDManny wrote:
On Oct 16, 11:57 am, HDManny <HDMa... (AT) gmail (DOT) com> wrote:
On Oct 7, 3:40 pm, "Steve W." <csr684... (AT) yahoo (DOT) com> wrote:

HDManny wrote:
I removed the intake and searched all over the manifold. I could not
find the fitting.
This may be a different year motor. I'll have to check that out. Where
would anothervacuumsource be?
Sounds like it is a different year. In that event just about any
manifoldvacuumsource will work as long as it is below the throttle
body. Shouldn't be hard to find one.
--
Steve W.
This issue is getting a bit ridiculous. I took the truck to a local
mechanic. He couldn't find thevacuumsource also.
He called Chevrolet for help. No luck there also. Finally he contacted
a customer with a similar vehile (99 S10 Blazer) that he is going to
examine today to find where thevacuumhose is coming from on that.
Hopefully it is the same.
This might seem unusual, But I'm getting used to the statement: "In
all my years doing this, I've never come across anything like this".

OK All squared away finally. We found that the vacuum source is at the
plug from the PCV valve on the manifold. *Aparently the plug used for
a 2WD vehicle is different than on a 4WD. I found a 4WD GMC at a
boneyard that has the port for the vacuum line and swapped it out.
Thanks

Yep, different because of that extra nipple.

--
Steve W.

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I went back and read what you wrote as to where it was located. You
were right Steve. Now I have another issue. I brought the truck to
Jiffy Lube Saturday. They told me I have 2 Oil Filters and they could
only get to the front one. I haven't figured out why there is another
one and where it is exactly.I do have an S10 Manual to look through. I
am sure it has to do with the 2WD motor in the 4WD truck again. There
must be a way to eliminate one of them?
I'm starting to wonder how much that 2000 boneyard 4WD motor is and
what it will take to swap that one.