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PostPosted: Sun Jul 18, 2021 3:19 pm 
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Joined: Mon Oct 16, 2006 8:17 pm
Posts: 2018
Location: Lincoln
Car Models: 9-5 estate 900 8v 95 van
Hi folks,I have recently acquired a project as above. It starts well and sounds great for a few seconds then cuts out. The pump is a new Bosch. I can hear the pump running as soon as the ignition is switched on which I’m told isn’t right. I’m on a steep learning curve as most of my recent work has been on v4s. Any thoughts?


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PostPosted: Sun Jul 18, 2021 6:20 pm 
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Joined: Wed Jun 20, 2018 6:05 pm
Posts: 91
Location: Nr Radstock Somerset UK
Car Models: 1993 T16S convertible
Fuel injection? Just the startup injector firing? I had the same thing with a Citroen DS a while ago and it was a temp sensor in the system. I'm afraid it's all magic as far as I'm concerned - I know naaaaathing!

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


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PostPosted: Mon Jul 19, 2021 7:34 am 
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Light Pressure Turbo
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Joined: Sun Apr 27, 2014 5:10 pm
Posts: 484
Location: Wiltshire
Car Models: '89 Saab C900 T16S 'Trenty'
My brother found this advice when he had a similar problem:

The later version’s relay (which your 85 may have) starts the pump when the ignition is turned on and runs it for a few seconds (to prime the fuel distributor), then does nothing until the key turns to start to turn the engine.

The early version starts the pump as soon as the key is turned then it keeps going as long as the key stays in run or it turned to start to turn the engine.

Your fuel filter is another possible problem?

My brother also ended up getting his auxiliary air valve and thermo-time switch checked.


This from another forum- The initial start could simply be the result of the cold-start injector pre-charging the intake with fuel vapour at cranking time, then it's up to the interaction between the warm-up regulator, auxilliary air valve an thermo-time switch to control the engine idle as it warms up.

Good luck!

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E38 740i ‘sporty shorty’ Daily driver (sold)


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PostPosted: Mon Jul 19, 2021 10:13 am 
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Joined: Mon Oct 16, 2006 8:17 pm
Posts: 2018
Location: Lincoln
Car Models: 9-5 estate 900 8v 95 van
Thanks for the response Ben,I’ll look into those :D


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PostPosted: Thu Jul 22, 2021 3:03 pm 
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Joined: Wed Nov 22, 2006 10:32 pm
Posts: 6652
Location: Glenrothes, Fife
Car Models: 95, 99, 900, 9000, 93, Sonett
Agree with the warm up regulator diagnosis. When it begins to fail, it makes the car difficult to start from cold. Worth having it inspected and rebuilt if necessary.

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