Saab 9-5 wont start Help !

[thetapeworm]

Unlikely but are the pipes to and from the fuel pump connected to the right place?

[Med1c]

thetapeworm said:

Unlikely but are the pipes to and from the fuel pump connected to the right place?

Thats a good point - I took picture before swapping pump just to make sure :-)

[thetapeworm]

Med1c said:

thetapeworm said:

Unlikely but are the pipes to and from the fuel pump connected to the right place?

Thats a good point - I took picture before swapping pump just to make sure :-)

Me too and I still screwed it up

[K321]

I've had a few breakdowns on my previous 2002 9.5aero.


1. Fuel pump
2. Crank sensor
3. Intercooler (x2)
4. Some electrical issue which fathomed the saab garage

[Med1c]

Ok managed to fix the problem :

The pressure of the fuel running to the plugs was very low and just dribbling out.

Clamping the return fuel hose from the engine allowed the fuel pressure to build up and now the clamp has been removed the problem has gone away.

Replacing the fuel pump must have caused a loss in fuel pressure but now all is running perfectly.

Strange end to the problem

Thanks for all the advice posted up - Much appreciated :-)

[thetapeworm]

Fickle beasts these Saabs

I "fixed" my full beam issue by tapping a relay the other day, if only all my woes could be sorted so easily.

Glad you're back on the road.

[Med1c]

thetapeworm said:

Fickle beasts these Saabs

I "fixed" my full beam issue by tapping a relay the other day, if only all my woes could be sorted so easily.

Glad you're back on the road.

Totally agree - These cars can be a challenge !

Thanks for your kind words :-)

[paulmakin]

nice one - there's not much that keeps them off the road, literally a case of "round up the usual suspects"

paul

[Mr E]

Very odd - glad you resolved it.

[bearman68]

paulmakin said:

think our posts just crossed - i wonder if the pump not running was a symptom rather than the cause. is the new one definitely priming when you ignition on ? - lift up the rear seat base and you'll clearly hear it when you turn the ignition to on. it'll then go quiet until it gets a signal from the ecu demanding fuel

immobiliser did occur to me but i'm pretty sure it wouldn't even crank if the immobiliser wasn't switching out

paul

Unlikely to be the immobiliser if the car cut out while running. Once the immob has done it's job, and sent the 'go' signal, that's it.
I would personally check to see if it has fuel coming to the engine by disconnecting a pipe. If that's OK, I'd then check for sparks by getting a plug out and checking. If you have sparks the CPS is almost certainly OK.
You can't rely on the rev counter showing RPM to diagnose a CPS, as it will sometimes take it from the cam sensor.
No sparks and no fuel = catastrophic electrical failure - check the ECU powers and grounds. This is about the limit of the checks you can do I would think with no specialist kit or code reader.
No code reader and no specialist kit

[bearman68]

Whoops - no I'll read the end of the thread. Nice to see I would have got there to.

[Roo1st]

Did you resolve this problem... As I have similar..... It started like bad petrol ......coughing and spluttering....then wouldn't start. AA said it was crank sensor .... Changed that still not start... Then changed the ignition coil pack. Problem still exists

[Med1c]

Roo1st said:

Did you resolve this problem... As I have similar..... It started like bad petrol ......coughing and spluttering....then wouldn't start. AA said it was crank sensor .... Changed that still not start... Then changed the ignition coil pack. Problem still exists

Try the fuel pump (located under rear seat) I got a secondhand part and car started fine after that - plus its an easy fit.