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When you put a new thread up in the Workshop please put your car's year and model in the post subject/thread title, along with just a brief indicator of the problem.

Car 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.

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PostPosted: Wed Sep 16, 2020 3:33 pm 
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Joined: Sat Jun 20, 2009 7:49 pm
Posts: 91
Location: Oxfordshire
Car Models: 900S Vert 92 & 9-5 Aero Hi
Hi
Been driving and messing about with Saabs for about 15 years (I currently have 3). This is a new one on me.
I was driving home last week in my 9-5 Aero estate and going down a country lane I started to overtake a cyclist. I put my foot down to pass quickly and all of a sudden I lost power and the car slowly shut down and I slumped to a halt. the car then would not restart.
After about 20mins cooling down it started and off I went until 3 miles further on it stopped again. Car is now in my garage.
I had no engine management lights and no oil pressure lights on Tech 2 has no fault reading.

Anyone got a clue where to start :?: :wall:


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PostPosted: Wed Sep 16, 2020 3:46 pm 
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Light Pressure Turbo

Joined: Mon May 05, 2014 5:22 pm
Posts: 440
Location: Lancashire
Car Models: 9-5 Aero
Crank position sensor.

Common problem, various brands available, iirc Bosch is best.


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PostPosted: Wed Sep 16, 2020 4:05 pm 
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Saab Nut
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Joined: Tue Sep 10, 2019 11:14 pm
Posts: 1096
Location: N Yorks
Car Models: 9-5 Aero Estates, 9-5 2.2 TiD estate, 9-5 2.0 Saloon, 9000 Aero
^^^
WHS

Fiddly job, but not difficult apart from access. Soak the bolt well in penetrating oil


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PostPosted: Wed Sep 16, 2020 4:57 pm 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42029
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
Thirded...

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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: Wed Sep 16, 2020 5:43 pm 
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Shotgun
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Joined: Tue Aug 08, 2006 8:51 pm
Posts: 13513
Location: 'Ull
Car Models: 95 Aero Auto Est Stg 1 Noobed
FYI, and if my memory serves me well, the fixing is a Torx Panhead bolt. It helps to have some Blu-Tak to hold the bolt on the Torx Head "key" otherwise it will keep dropping off (unless very magnetic?).

WIS procedure below :wink:

Attachment:
CPS.pdf [463.56 KiB]
Downloaded 6 times

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den bara markerar sitt territorium


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PostPosted: Wed Sep 16, 2020 5:53 pm 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42029
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
Also make sure that the O ring seal comes out. If you fit the new O ring on top of the old one, it may cause the sensor to perform badly.

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PostPosted: Fri Sep 18, 2020 12:06 pm 
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Joined: Sat Jun 20, 2009 7:49 pm
Posts: 91
Location: Oxfordshire
Car Models: 900S Vert 92 & 9-5 Aero Hi
No, No, Not crank position sensor. Just changed it and still the same.

Have had them go before and usually wont start when cold. This will start cold and when it get hot and under pressure engine dies and will not start till rested.

:wall: :wall:


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PostPosted: Fri Sep 18, 2020 12:12 pm 
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Saab Nut
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Joined: Tue Sep 10, 2019 11:14 pm
Posts: 1096
Location: N Yorks
Car Models: 9-5 Aero Estates, 9-5 2.2 TiD estate, 9-5 2.0 Saloon, 9000 Aero
Usual failure mode of CPS sensor is fine when cold, loss of signal when hot.

When you say "just changed it", does that mean, since the original post or before then ?

You do only have one o ring in place don't you ;)


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PostPosted: Fri Sep 18, 2020 12:19 pm 
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Joined: Sat Jun 20, 2009 7:49 pm
Posts: 91
Location: Oxfordshire
Car Models: 900S Vert 92 & 9-5 Aero Hi
Yes, after post and only one ring


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PostPosted: Fri Sep 18, 2020 12:28 pm 
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Saab Nut
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Joined: Tue Sep 10, 2019 11:14 pm
Posts: 1096
Location: N Yorks
Car Models: 9-5 Aero Estates, 9-5 2.2 TiD estate, 9-5 2.0 Saloon, 9000 Aero
If the problem is still recurring then I would say it is a heat related problem on the wiring somewhere.

Good news is you have a Tech 2.

I would be watching for an rpm reading while you are cranking over and not starting.

No rpm signal, then it's CPS wiring related

RPM signal, then I would be looking a wiring to the DIC, the DIC itself or less likely fuel pump wiring. Or the pump itself, though they tend to fail or not.

Does the fuel pump operate when you try to start the car. (relieve the pressure at the fuel rail, then switch ignition on, you should hear the buzz)

Just for reference, what resistance do you get across two of the pins on the CPS connectors - probably about 950 ohms ??


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PostPosted: Fri Sep 18, 2020 1:04 pm 
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Barrelling Along
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Joined: Fri Nov 23, 2007 6:13 pm
Posts: 20767
Location: Maidstone
Car Models: 9-5 Aero
Just because the sensor is new doesn't mean it can't fail :wink:

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Prefers driving over polishing or reading.


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PostPosted: Fri Sep 18, 2020 1:05 pm 
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Saab Nut
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Joined: Tue Sep 10, 2019 11:14 pm
Posts: 1096
Location: N Yorks
Car Models: 9-5 Aero Estates, 9-5 2.2 TiD estate, 9-5 2.0 Saloon, 9000 Aero
.... hence my final question ;)


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PostPosted: Fri Sep 18, 2020 2:59 pm 
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UKS Encyclopædia G-M
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Joined: Sun Aug 15, 2004 9:39 am
Posts: 42029
Location: SW Herts
Car Models: 2007 9-5 Aero est. 300hp Hirsch. 9-3 2010 9-3 Carlsson
I'm in the middle of changing mine. Car failed to start yesterday, when hot.

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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: Fri Sep 18, 2020 3:44 pm 
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Saab Nut

Joined: Sat Aug 12, 2017 8:31 pm
Posts: 1157
Car Models: 9-3 1.9tiD Vector S Anniversry
Had CPS failure on my laguna, would only die when hot and idling. Normal driving was OK. £65 it cost me from renault and only lasted a year, then got an ebay one for £8 which was on for another couple if years til I sold it.


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