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PostPosted: Mon Oct 15, 2018 5:21 pm 

Joined: Tue Jul 17, 2018 1:15 pm
Posts: 3
Car Model: C900
My Pieburg 175 CD carb works fine on cold starts and out on the open road.
Problems with warm start when the car has been left for say 20 mins. I checked that all pipes are sound and connections tight.
Any ideas or proper schematics would be a help.
Hope someone can help.
Davidtjm :?:

PostPosted: Mon Oct 15, 2018 8:52 pm 
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Joined: Mon Oct 23, 2006 6:23 pm
Posts: 4331
Location: Chesterfield
Car Model: '87 c900 8v '95 9000 CD XS
Hi Davidtjm, and welcome to UKS!

I cannot offer a solution, but you are not alone with this issue. I experience a similar thing with my Pierburg carb in my 1987 c900 too, where it will cut out at an inconvenient moment after being stood about 20mins ish, like when pulling out of a supermarket car park. Also, if in slow traffic when the car is hot, and facing slightly uphill, the revs drop down and feels like it's going to cut out, so have to pull the choke on to stop it cutting out. Once moving again and cooled down a bit, its absolutely fine. From things I've read and people I've spoken too about this in the past, it could be a fuelling issue, or maybe even petrol evaporating from the carb somehow. I have considered a secondary fan positioned near the carb for a bit of extra cooling in this area to see if this helps, but not got any further than thinking about it!

I've had this issue ever since I've had my c900, which is 7 years now. I've changed the fuel pump, fuel filter and carb diaphragm in the process of elimination, but to no avail.

I felt like I have been alone with this issue, so glad someone else is experiencing it too! Anything you find out would be of great interest to me too.

1987 c900 8v Carb 2dr 4 speed
1995 9000 CD XS

PostPosted: Wed Nov 07, 2018 12:20 pm 

Joined: Tue Jul 17, 2018 1:15 pm
Posts: 3
Car Model: C900
File comment: Note Saab Enthusiast in passenger seat!
C900 P n J.jpg
C900 P n J.jpg [ 208.69 KiB | Viewed 416 times ]
Hi Yogi900
And thanks for the welcome.

Investigated the warm start problem again and did a few things.
Found small crack in one of the EGR hoses and replaced it - see green pipe in photo.
Another hose was quite loose fitting so I fitted a jubilee clip to tighten it up - also in photo.
Lubricant was low in the dashpot so I topped this up.
Car has been okay since and the tickover is smoother.

However I have noticed that it's important not to put on the choke when starting after say, a 20 minute rest following a drive around ie when the engine is still kinda warm. You can put on the choke after the engine catches if the tickover is low but not before.

There's a Volvo Fuel Systems manual that you can download from the following website. This provides some information on the Pierburg 175 Carb. There's suggestions on what action to take for rough idle & stalling on page 16. Hope this helps. ... el-Systems

Rgds Davidtjm

File comment: Hoses C900
Hoses C900.jpg
Hoses C900.jpg [ 126.5 KiB | Viewed 416 times ]
PostPosted: Wed Nov 07, 2018 7:52 pm 
Saab Nut
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Joined: Sun Jul 29, 2007 9:32 pm
Posts: 1256
Location: Bath/ Dublin
Car Model: 8V-V4
That is a very nice car, is it still in Dublin? Saw a white 900 recently, may have been you, there's not that many around.


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