Cranks, but won't start

[Eljosh]

I think my fuel injectors might be messed up. Because my car was running 3 days ago. And then it sat for one day, without being started. And I went to started it yesterday. And it doesn't start, I've checked spark, I have it. I checked fuel pump, it works, and sends fuel to the Fuel Pressure Regulator. Checked the main and fuel relays, both are good. So I was thinking it was the ecu, so I started to checking all the terminals on the connectors, all the grounds work and such, but when I got to test the injectors, they don't make a clicking noise, like the bentley says. We thought we heard it one time but not sure. How loud would they be? and what would make all the injectors to stop working? I cleaned the injector connector thing.
Any ideas?
Thanks
Also I've sprayed starter fuel up the intake, and it started, and if I let the car sit for awhile it will turn over and like fire once.

[paperplane94]

Yup, sounds like a lack of fuel.
Can you pull off the injector connector and ohm test each one?

How is the fuel pressure?

[lennon]

Check the fuel pressure.

Get some noid lights (aka injector test lights). They loan them at Advanded or Autozone. You plug it in where you injector plugs in, and it flashes if the DME is firing the injector (when cranking). A regular test light isn't good enough for this.

Do you have 12v at the injector plugs with the ignition on (each injector has two pins, both should have 12v when the ignition is on, when the DME fires an injector, it switches one of those to GND). What year/model is your car? The late models have a "separate" injector harness that plugs into the main harness. Sometimes there can be a problem at that connection. Under the intake manifold/behind the fuel rail, follow your injector wires to it.

Report back...

[Eljosh]

I got a 89 325is, and fuel pressure looks ok, I took the one hose off the Pressure Regulator, and flowed good.
And do I have to take off the intake manifold to test the injectors?

[paperplane94]

The hose you disconnencted was actually the fuel return hose, the fuel feed hose goes straight to the fuel rail.
like so:


Yes, you can test the injectors easily.

Just remove the bracket on the valve cover, diconnect the injection harness from the c191 connector under the throttle body, disconnect the temp sensors on the thermo housing and remove the injector harness.

You will want to test with the noid light and ohm out the injectors with a multimeter.