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[Saab c900] Start, Fires, Dies

Ho hum.

After a productive afternoon replacing the defective heater valve I had my 1985 8 valve injected 900 idling away quite happily to get up to temperature so I could check for coolant leaks.

The car idles a bit too fast so I took the opportunity to just back off the throttle stop a touch. It started to hunt then died. No worries thought I, just speed it a little...

It now starts on all four cylinders, runs for a second or two then dies.

Throttle position has no effect. It was low on fuel but now has over two gallons, the pump in the tank can be heard to run for a few seconds and then stops, fuel reaches the filter and is under pressure.

The car ran perfectly this morning.

Ideas? I'm a bit stumped and it's in the way where it is at the moment.

Reply to
sweller
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Someone will have the answer there.

Reply to
Chris Bolus

try hotwiring the pump

Reply to
mrcheerful

Is this CIS injection? If so, it might be a plugged control pressure regulator, unplug the starting injector and see if the car still starts at all. I've been cleaning up a very similar mess on a '79 Volvo, the car sat and the inside of the fuel filter rusted apart and puked a whole mess into the injection system.

Reply to
James Sweet

in article MurDf.10649$Ix.5996@trnddc07, James Sweet at snipped-for-privacy@hotmail.com wrote on 30/01/2006 16:51:

As a 1985 8V, it will be CIS.

Unbolt the injectors from the manifold and arrange them into transparent collector (like jam jars), pop the bellows off the fuel mixture unit and pull the plate up. Do the injectors spray well?

Do you have a massive air leak somewhere? Try firing up with the throttle open and then back down to part throttle. Let off the throttle and see if it dies. That would indicate a huge air leak.

Did you check the oil when doing your recent work? Make sure the dipstick is correctly inserted and pushed down tight.

Paul

1989 900 Turbo S
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Reply to
Paul Halliday

Thanks for all the responses but frustratingly it turned out to be the pump.

The mechanic at Mann & Woodland (Hove, E. Sussex) told me how to check the injectors which weren't getting fuel. It was then a process of working backwards down the system which led to the pump.

Which ran but didn't pump fuel.

The filter appeared to be under pressure on initial checks and coupled with the sound of the running pump when I bridged the relay led me to believe all was well in that department. I discovered with a replacement pump just how under pressure the fuel delivered was...

£30 for a s/h pump and a bit of head scratching. Respect to Mann & Woodland for their advice and putting me on to another Saab specialist, Hawkleys (Southwick, Sussex), when they didn't have a used pump.
Reply to
sweller

in article snipped-for-privacy@news.individual.net, sweller at snipped-for-privacy@mztech.fsnet.co.uk wrote on 31/01/2006 08:55:

Well, it's good news you've found the problem.

Sounds like two garages worth using again, there.

Result! Paul

Reply to
Paul Halliday

That's good news! I'm yet to try the simple idea of swapping the fuel pump currently in my 8V turbo car with the one that I'm assuming to be good still mounted in the tank of the donor car. Once I receive a package of AMP connector parts from Eagleday.com I will repair the hall-effect wiring harness and see if I can get the engine to run. So far I've done fuel pressure tests which seemed to give correct results, and I've changed the fuel filter as well.

Last time I had the engine running it stalled when I tried to give it some more throttle and hasn't started again since. 8-)

Craig.

Reply to
Craig's Saab C900 Site

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