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PostPosted: Sun Mar 17, 2019 9:13 am 
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Joined: Sat Mar 16, 2019 5:37 pm
Posts: 5
Car Model: 93 1.8t Sportwagon T.Edition
Hi, my 93 has been in the workshop for two and a half months now(!!!!!) with a misfiring issue. It won't start at all below 5°C and above that up to about 10°C it will eventually start but will misfire heavily until the choke turns off. It'll still be lumpy until it warms up fully, but the power can feel all there or like it's lacking a bit. Now apparently it's even slightly missing when driving, although the engine is running perfectly smoothly otherwise.
The garage are a Saab specialist so they've been using a donor car to swap parts thank god, but nothing has worked. From memory they've replaced
Coils and plugs
Tested injectors
Earth points
All temperature and ECU sensors
Throttle body
Fuel rail
EVAC valve
And I think there were a few other bits I've forgotten. Basically everything mechanical has been tested. The only thing they haven't been able to test is the ECU, which they think is the only thing it can be now. Apparently they've never seen this problem, nor has anyone else they've contacted.
So I'm in need of either someone who can test the ECU for faults, or just get a new one!
Any help would be hugely appreciated!

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59 93 1.8t Sportwagon Turbo Edition


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PostPosted: Sun Mar 17, 2019 10:37 am 
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Saab Nut

Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1994
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
There are two issues which crop up giving similar symptoms either soft valve problems or indeed the T8 ECU.
So has a compression check been done to eliminate the possible valve issue?
https://www.saabcentral.com/forums/show ... p?t=329066

If the T8 needs replacing its not too hard a job....

Look at the videos (part 1 and 2) in the link below
https://www.saabcentral.com/forums/show ... p?t=719528


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PostPosted: Sun Mar 17, 2019 1:03 pm 
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Joined: Sat Mar 16, 2019 5:37 pm
Posts: 5
Car Model: 93 1.8t Sportwagon T.Edition
It's had a compression test done and everything was fine apparently. They're scratching their heads now so if it isn't ECU then who knows what's wrong with it. How close do the numbers on a second hand ECU have to be for it to be compatable?

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59 93 1.8t Sportwagon Turbo Edition


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PostPosted: Sun Mar 17, 2019 6:09 pm 
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Active user

Joined: Mon May 04, 2015 8:25 am
Posts: 230
Location: Near Blackpool. No Near Fleetwood
Car Model: 9-3 Aero SS (Stage 1)
Any ECU can be used from a 2003 up. However using a 2003-2006/7 ECU will require MCP programming with a 2008+ file as well as the specific binary for your car. If you get a 2008+ ECU only the specific binary needs programming. Your Saab specialist may not know this. A friend of mine had a 2005 swapped into a 2008, and it caused all kinds of problems, as Saab specialist didn’t know about the MCP side to the ECU.


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9-3 Aero Coupe(Stg1)*
9-3 SE 2.0T vert(Stg1)*
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PostPosted: Sun Mar 17, 2019 6:12 pm 
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Saab Nut

Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1994
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
They dont if you follow the cloning procedure.
Part numbers from the EPC going the Tech2 route.
Image


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PostPosted: Sun Mar 17, 2019 6:39 pm 
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Saab Nut

Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1994
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
Do you have a list of the error codes?


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PostPosted: Sun Mar 17, 2019 8:26 pm 
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Joined: Sat Mar 16, 2019 5:37 pm
Posts: 5
Car Model: 93 1.8t Sportwagon T.Edition
Well that's interesting, the guys at the garage seem to think that they all have different pin patterns for each model and year, which i did think was pretty weird. So to re programme a 2008 onward ECU all i need is the code from the original? I have a bit of know how mechanically but when it comes to electrical stuff I'm fairly lost!

The only error code it's throwing up is random/multiple misfire detected (P0300). I'll give them a ring or a visit tomorrow and direct them here and see what they have to say. Two and a half months is far too long to be without your car!

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PostPosted: Sun Mar 17, 2019 10:35 pm 
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Saab Nut

Joined: Tue Feb 10, 2015 8:13 pm
Posts: 1994
Location: Peterborough UK
Car Model: 9-5 Aero 2001,1.9TID x 2
The coils are genuine parts?...lots of issues with aftermarket ones.
https://www.saabcentral.com/forums/show ... p?t=535961

Typically if the ECU is bad you get a lot more codes than basic misfire codes...they have a Tech2?
Do they get misfires for each coil?
Have they moved the coils around to see if the codes change?


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