Just cranks over and won’t start

[Serpriz]

Car drove fine, went to go start it later and just cranks over and won’t start. Sounds like relay is coming from the passenger side seat area. I don’t understand and can’t find the clicking relay!

[Serpriz]

Bump

[swisssaabist]

Cold or hot start ?

[Digger]

Fuel pump relay is on passenger side behind trim panel, check for gas pressure at fuel rail.

[Serpriz]

I drove it home, parked it, went back out a hour after to leave and won’t start, just hear the relay clicking sounds like underneath the seat?

[Digger]

I drove it home, parked it, went back out a hour after to leave and won’t start, just hear the relay clicking sounds like underneath the seat?

Got it, clicking sounds like underneath the seat. But still don't know if you have any fuel pressure, also will help greatly when asking questions like this to know year of car and engine type.

[Serpriz]

Sorry car is 2002 Saab 9-5 linear I believe 2.3

[Digger]

There are some things specific to Saab that cause odd starting problems like the batteries in the older car security systems. A clicking seat relay isn't one of them, but a clicking relay could be a symptom of a failing battery, or a crusty connection. Still don't know if you have fuel pressure at the injectors when this happens.

When cranking a car with a gas engine you need to have compression, fuel, air and spark. Take any one of these away and the car won't start. This is a vintage vehicle in a northern climate, most any problem you have with starting this time of the year is going to be shared with every other 16 year old car up here. Crusty battery cable ends, rusty ground points, warm engines with more compression than when they are cold and batteries that have enough life left in them to light up the plugs and crank the engine when cold but not enough to do both when warm. So next time it doesn't start, check to see if you are getting gas to the engine.

[Serpriz]

Thank you, I’m going to mess with it today and see if I can find the problem.

[Serpriz]

We are getting fuel to the rail but no spark