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When you put a new thread up in the Workshop please put your car's year of registration (not plate or model year) in the post subject/thread title, along with just a brief indicator of the problem.

Registration Year - Car Model: Brief description of issue. EXAMPLE- 1999 9-3. Problems starting when hot.

For Tech II issues or help requests please state the following in your title ''Tech 2 help required - state issue and your location ''.


Please also add as much information as you can about the problem, to your post.

This will help us to help you, without having to ask basic details such as what car you have.


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Nb. Generic thread titles for truly generic issues that genuinely are not model or variant specific (such as "how do I change the spring in an forge wastegate actuator") are acceptable

**The first 5 posts for new users require individual moderator approval (which they will only get it if they are in line the rules of the forum). Please be patient and allow time for that to happen, and avoid duplicate postings.**



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PostPosted: Thu May 09, 2019 11:30 am 
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UKS Addict

Joined: Fri Jan 09, 2015 7:22 am
Posts: 2007
Location: Forest of Dean
Car Models: OG 9-3 SE
I was wondering if an old technique for tracing vacuum leaks would work on Saabs?

I used to spray carb cleaner over the induction and vacuum hoses on my old Golf GTI in order to find leaks, if there was a leak you'd, hear the engine note change as it sucked in the carb cleaner.

Would this work on Saab turbo engines, including intercooler pipes etc?

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2001 OG 9-3 lpt Hatch, gone
BMW 120d with indicators


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PostPosted: Thu May 09, 2019 11:34 am 
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Full Pressure Turbo

Joined: Mon Mar 18, 2013 8:47 pm
Posts: 650
Location: Sunny Chester
Car Models: 9-3SW Sportwagon Aero TTiD
Smoke test is the best way.
https://youtu.be/L9CDZ9lu6Rs


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PostPosted: Thu May 09, 2019 11:56 am 
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UKS Addict

Joined: Thu Sep 01, 2005 5:31 am
Posts: 5831
Location: Bucks
Car Models: Saab NG 9-5 Aero
Given Saab's choice of material for the vacuum hoses it is actually cheaper and quicker to just replace the lot with something decent.


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PostPosted: Thu May 09, 2019 12:12 pm 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42462
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
Carb cleaner will only work on vacuum/suction. But the turbo won't be kicking in while the car is stationary, with the throttle closed the inlet will be under vacuum, so it should work.

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Everything will be OK in the end. If it's not OK, it's not the end...


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PostPosted: Sat May 11, 2019 5:31 pm 
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UKS Addict

Joined: Thu Sep 01, 2005 5:31 am
Posts: 5831
Location: Bucks
Car Models: Saab NG 9-5 Aero
sgould wrote:
Carb cleaner will only work on vacuum/suction. But the turbo won't be kicking in while the car is stationary, with the throttle closed the inlet will be under vacuum, so it should work.

It is not unknown for a pipe to be fine at idle but leak like a sieve under boost


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PostPosted: Sat May 11, 2019 11:20 pm 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42462
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
Indeed. But you can't get any boost when the car is stationary.

One person I know put a webcam under the bonnet to look at things. On full boost, it melted!! :D I did see about 10 seconds of video. Then the turbo went red and the picture went black!!

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Everything will be OK in the end. If it's not OK, it's not the end...


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PostPosted: Sun May 12, 2019 9:27 am 
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UKS Addict

Joined: Thu Sep 01, 2005 5:31 am
Posts: 5831
Location: Bucks
Car Models: Saab NG 9-5 Aero
sgould wrote:
Indeed. But you can't get any boost when the car is stationary.

That was rather the point, you can squirt all the carb cleaner you like but you won't find it that way if it only leaks under boost. Hence the suggestion to just replace the vacuum hoses as it is much quicker and easier than messing around trying to find the leak. Also worth considering that the bypass valve diaphragm can split and cause an internal leak, I had this on a 9000 back in about 1991 but I can't remember the symptoms. Easily checked by blowing and sucking on a length of hose connected to the valve.

sgould wrote:
One person I know put a webcam under the bonnet to look at things. On full boost, it melted!! :D I did see about 10 seconds of video. Then the turbo went red and the picture went black!!

I am surprised it lasted that long! People occasionally ask if the heat shields are necessary, this gives an illustration of the answer to that.


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PostPosted: Sun May 12, 2019 5:40 pm 
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Light Pressure Turbo
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Joined: Tue Jan 15, 2013 7:20 pm
Posts: 599
Car Models: 2006 9-5 2.3 HOT Aero Estate
I've often had these but ALWAYS had a CEL and either ELM/Torque or a Tech II have narrowed the search (last one was last week when a non return/check valve cracked, this beast is already silicone hosed).


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