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[AndyT]

My Omega is a 2.5 V6 CDX Auto.
  HELP!!   After thousands of miles not missing a beat, yesterday it started to idle a bit rough and to hunt. I ignored it and carried on with my journey cruising at a nice steady 70 down the motorway on cruise control. Then after about 20 miles it started missing, a little at first and then over the next 10 miles it got worse until it died altogether. No way would it start and I had to call for rescue to get home.
Today I tried again to start it. Every time it just fired up and died immediately. Only once did it run for about 10 secs then died as soon as I touched the accelerator. Noted that all the warning lights went out as normal.
I suspected a fuel feed problem. I removed the petrol feed and return pipes at the engine and stuck them in a jar whilst cranking. Petrol came through OK. I checked the fuses, especially fuse 16 - all OK. I checked all other electrical connections but it made no difference.
Any ideas?
Could it be one of the sensors? - which one?
Andy T

[cem_devecioglu]

Before the sensors..Do you have EML light..Whats the mileage..

Can be crank sensor or anything at first sight..But ECU codes must be checked

[Danny]

EML lit at any point??

[AndyT]

EML light was not showing while it was still running. And on the one time when I got it fired up for about 10 secs it went out almost straight away - like usual.
Andy T

[AndyT]

oh - and mileage is 103k

[JamesV6CDX]

It does sound like fuel starvation.

Is fuse 18 OK, (note, 18, NOT 16!) and is there fuel in the tank?

[TheBoy]

Do a paperclip test anyway, and post back results....

Additionally, check plug wells for signs of oil.

[AndyT]

Sorry misprint - yes I checked fuse 18 and it was OK.
There is fuel in the tank (not a lot - about 15 litres) - is it worth putting another 20 litres in (I read on this forum somewhere that a failing pump can stop working if the level drops below 1/4 full).
Plug wells look dry ( at least on the bank you can get to easily - cam gaskets were changed about 2000m ago (with genuine VX ones).
Will get the paperclip out tonight and report back.
Andy T

[TheBoy]

Sorry misprint - yes I checked fuse 18 and it was OK.
There is fuel in the tank (not a lot - about 15 litres) - is it worth putting another 20 litres in (I read on this forum somewhere that a failing pump can stop working if the level drops below 1/4 full).
Plug wells look dry ( at least on the bank you can get to easily - cam gaskets were changed about 2000m ago (with genuine VX ones).
Will get the paperclip out tonight and report back.
Andy T

failing pump, you wouldn't get fuel at fuel rail (diesels, the tank pump is purely a lift pump, but in petrols its much more important)

[Martin_1962]

I suspect crank sensor, does it start at all if left for a few hours?

[AndyT]

Martin,
No - makes no difference how long it stands - just fires up and dies instantly.
Andy T

[cem_devecioglu]

Your problem seems to be ECU stopping ignition.


Anyway crank sensors are cheap..Will worth checking with a new one...

[ians]

Anyway crank sensors are cheap..

are they?  I thought they were c 50 quid give or take..  for me that is a lot for just experimenting without knowing it will fix the problem.

Anyway surely the paperclip will show up the problem if its crank sensor..?

[TheBoy]

paperclip may or may not be conclusive....   ....post up results of test, and we can ponder it...

[cem_devecioglu]

Anyway crank sensors are cheap..

are they?  I thought they were c 50 quid give or take..  for me that is a lot for just experimenting without knowing it will fix the problem.

Anyway surely the paperclip will show up the problem if its crank sensor..?

Here I buy for 35 £ ..This is the most critical part that will let you with a 1.6 tons of non moving metal in the middle of the road..

if you dont like surprises and to pay for the carrier truck its better to pay for that I think..

Also note that even without any problem I think changing this sensor is a preventive action..If you go to the service with car on truck the prices really change.