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PostPosted: Sat Mar 05, 2022 8:55 pm 
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Joined: Fri Dec 03, 2021 10:09 pm
Posts: 98
Location: Pagham West Sussex
Car Models: 900i
Hi all,

can anyone tell me if this is correct on my throttle body, there is what i can explain as two vacuum outlets side by side and they are just coupled together as in the image.

is this correct? or should they be routed else ware?

Gaz.

Image


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PostPosted: Sun Mar 06, 2022 4:27 pm 
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Joined: Wed Jun 20, 2018 6:05 pm
Posts: 118
Location: Nr Radstock Somerset UK
Car Models: 1993 T16S convertible
Attachment:
c900_vacuum_diagram.jpg
c900_vacuum_diagram.jpg [ 113.73 KiB | Viewed 295 times ]
I can't work out from your photo what weirdness is going on around your throttle body, but......
This is a picture that was posted ages ago - lifted from SaabCentral. Don't know who posted it, but thanks to whoever it was, as it's been an absolute Godsend to me, and should show you what should go where!

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David
'93 T16S convertible
(at the end of a long line of various Saabs - all a long time ago...)


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PostPosted: Sun Mar 06, 2022 8:03 pm 
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Joined: Fri Dec 03, 2021 10:09 pm
Posts: 98
Location: Pagham West Sussex
Car Models: 900i
David Wilson wrote:
Attachment:
c900_vacuum_diagram.jpg
I can't work out from your photo what weirdness is going on around your throttle body, but......
This is a picture that was posted ages ago - lifted from SaabCentral. Don't know who posted it, but thanks to whoever it was, as it's been an absolute Godsend to me, and should show you what should go where!


Hi David, thank you very much for this but sadly the image is for a 16V set up and a different type of fuel injection as to what is in my 8V car.

Still open to suggestions though.

Gaz.


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PostPosted: Mon Mar 07, 2022 1:30 pm 
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Joined: Wed Jun 20, 2018 6:05 pm
Posts: 118
Location: Nr Radstock Somerset UK
Car Models: 1993 T16S convertible
Aah....
I didn't think they'd be different!
(I can't find an 8V version anywhere.)

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David
'93 T16S convertible
(at the end of a long line of various Saabs - all a long time ago...)


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PostPosted: Mon Mar 07, 2022 3:29 pm 
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Full Pressure Turbo

Joined: Fri Jun 16, 2006 9:26 pm
Posts: 890
I think the vacuum connections were for an EGR system on other markets. What's been done to blank them off should be fine. Originally I think there would have been a rubber block fitted over them.


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PostPosted: Tue Mar 08, 2022 8:35 pm 
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Joined: Fri Dec 03, 2021 10:09 pm
Posts: 98
Location: Pagham West Sussex
Car Models: 900i
99 Pete wrote:
I think the vacuum connections were for an EGR system on other markets. What's been done to blank them off should be fine. Originally I think there would have been a rubber block fitted over them.


Still a little baffled over this and have googled many images as i can find of 8V engine bays and even individual throttle bodies but the only thing that i have found close to mine with the two outlets is an Australian spec throttle body??

I suppose it'll be one of those mysteries but thank you for your answer.

Gaz


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PostPosted: Fri May 13, 2022 3:35 pm 
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Joined: Wed Oct 24, 2007 8:49 am
Posts: 242
Location: UK
Car Models: Saab 900i 1984 and 1986 (now sold)
99 Pete wrote:
I think the vacuum connections were for an EGR system on other markets. What's been done to blank them off should be fine. Originally I think there would have been a rubber block fitted over them.


The EGR system was fitted to UK cars. Not sure about other markets. I had a 900i 1984 and 1986 - both had EGR.

What you have is not standard. The EGR connection has been in effect blanked off by some tube. Its unclear what has been done at the other end at the intake manifold. The fuel pipes are also not standard. I see from another post you had a problem with a rough tick over. That may be related to the EGR, or could be caused by something else.

People who make modifications do so at their own peril. I would keep it as standard, or put it back to as stock.

The non turbo 8v cars don't normally have fuel issues if you keep them as stock. At least that is my experience over 30+ years.

I cannot see the benefit of removing the EGR connections. They are there for emission purposes. Those who want better performance, should buy a turbo model, not mess with what is known to work.

Here are some photos off my 1986 which shows how the pipes should be. Sold my 1986 last year, don't own a C900 now.

Suggest you get hold of online copies of the Saab Service manuals. Bentley is OK, but is abridged version of the manuals. You need sections 2.3 1981-93 and 2.4 1981-86.


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PostPosted: Sat May 14, 2022 11:26 pm 
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Joined: Fri Dec 03, 2021 10:09 pm
Posts: 98
Location: Pagham West Sussex
Car Models: 900i
Hi Ricky,

thank you for the detailed reply. This makes a lot of sense and i understand it now.
The thermo vacuum switch is still on the inlet manifold and taking a better look at it, i can now see that one of the pipe unions has been snapped off, probably hence why a past owner has blanked off the throttle body connections and done away with the vacuum pipe.

The rest of the EGR set up is still on the engine, it looks like i may have to come up with a solution of bonding a vacuum pipe connection to the thermo vacuum switch on the manifold as i cannot seem to find new ones, probably no longer available unless someone has any?

A comment on another post of mine mentioned the wrong fuel lines, that was me. The plastic original over inlet manifold lines were decidedly very fragile and i was concerned of failure and fire risk, original spec are no longer available so i purchased these alternatives direct from Sabbits.

Gaz.


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PostPosted: Sun May 15, 2022 6:16 am 
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Joined: Wed Oct 24, 2007 8:49 am
Posts: 242
Location: UK
Car Models: Saab 900i 1984 and 1986 (now sold)
In my experience the fuel pipes don't normally fail. They normally out live the life of the vehicle. They look fragile because they are made of some sort of plastic material. There is no need to replace them unless inadvertently damaged/broken whilst working on the engine.

I have a spare set of all the plastic fuel lines, which I don't need now, but you have probably kept the originals. I don't think I have a spare vacuum pipe. I got rid of a lot of stuff early this year while de-cluttering my loft.

You might find a pipe from someone breaking an 8v for spares, or you could put a wanted advert in the classified section of this forum.

I've lots of new and used parts.

Link to C900 service manuals:
https://www.saabnet.com/tsn/faq/manuals/C900.html


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