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[Doctor Gollum]

Does the fuel pump turn on with the ignition?

It should run briefly.

[danzigfan]

No...I can't hear it. But as far as I can remember It never ran before cranking...even when all was fine with the car

[Doctor Gollum]

That might be a problem.

It should run for a couple of seconds when the ignition is first turned to position 2. It then won't run again until the ECU receives a signal from both the crank and cam sensors.

Basically there should be just enough fuel in the rail to start the car and allow it to run for a couple of seconds.
Bang the bottom of the tank as someone cranks the car. If it fires then the fuel pump has failed.

So next question...

Are you getting a spark?pop out the #2 plug and place it against the lifting eye and try cranking it again. If it sparks then you've a fuel issue or a crank sensor one.

[zirk]

long Shot, do you charge a Power bank via Front or Rear Ciggy Lighter Socket and if so are you leaving it plugged in when you start or trying to start the Car?

If so remove it before locking up, or if it's non starting remove the PB and do this -

Remove Key from ING Barrel, open Drivers Door then close it, lock the Car with Fob or Key, Unlock the Car, open Drivers Door, shut Door then try a new Start.

Even without a Powerbank, you you could try the above.

[danzigfan]

That might be a problem.

It should run for a couple of seconds when the ignition is first turned to position 2. It then won't run again until the ECU receives a signal from both the crank and cam sensors.

Basically there should be just enough fuel in the rail to start the car and allow it to run for a couple of seconds.
Bang the bottom of the tank as someone cranks the car. If it fires then the fuel pump has failed.

So next question...

Are you getting a spark?pop out the #2 plug and place it against the lifting eye and try cranking it again. If it sparks then you've a fuel issue or a crank sensor one.

Have spark but car keeps stalling after I replaced crank sensor.
Runs fine only if I give it some beans.
Will pop the fuel rail off now...

[danzigfan]

I replaced fuel pump.....car runs for about 4 minutes on idle then dies with AC on.
It stalls almost emediately with AC off.
Takes longer to start in both cases

[TheBoy]

So I think this is different to the immobiliser issue.

Do you have the tools to get live data readings? If so, what is the MAF (g/s or Kg/m), and is the idle stable or lumpy?

[danzigfan]

No access to live data sorry....Procedure was as follows:
Yesterday car was dead, cranking but no start, eml showed 31 and 144
Today: Replaced crank sensor - cranked for a long time then started with very lumpy idle, not firing all cylinders.
Removed fuel lines by the plenum and there was no fuel pressure...only few drops came out. Eml was still flashing immobilizer code at first cranking then it disappeared for good.and didn't come back.
Then I replaced fuel pump - car ran noticably better, but stalls after 3 - 4 minutes.

I noticed the engine stalls if I turn AC OFF emediately. With AC ON, it runs a bit longer, I assume because of higher RPM's.

Another thing is....Engine stalls when it reaches operating temperature.

I will replace MAF now and report.
It's a good thing I have many parts from previous V6

[Doctor Gollum]

What crank sensor did you fit?

[danzigfan]

...can't remember now, I'm at work...Something like NTK was the brand. Only two makers were available and this one wasn't cheap I' go for Bosch one if I could.

[danzigfan]

Can't report on idle problem yet but I made a 100 miles to work today and it ran fine...all motorway so no idling.

[ronnyd]

Can't report on idle problem yet but I made a 100 miles to work today and it ran fine...all motorway so no idling.

That's a fair old commute. 

[STEMO]

Can't report on idle problem yet but I made a 100 miles to work today and it ran fine...all motorway so no idling.

That's a fair old commute. 

It certainly is! In this country, it would be time to come home as soon as you got there.

[TheBoy]

Can't report on idle problem yet but I made a 100 miles to work today and it ran fine...all motorway so no idling.

That's a fair old commute. 

I think its not far off normal now...

[TheBoy]

The Omega seems excessively fussing with crank sensors.  That's why we always say, without fail, use a genuine one direct from a GM dealer (not online, egay, Amazon, whatever, and also not other brands, including Bosch and Siemens).


However, I don't think this is a crank sensor issue.  9 times of of 10, it will through a crank sensor code (the 31 on a 2.5/3.0 is not a crank sensor fault code), which is 19 for 2.5/3.0 and 0335 for 2.6/3.2