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[Grimble]

Calling all Omega techies

Recently my 1996 Omega 2.0l 8-valve petrol estate has developed an intermitent (and very irritating) problem where it wont start up. It could have been running fine all day, I stop at a shop, turn off, get the shopping, get back in, turn ignition - wont fire up. Try several times - no luck, walk home, go back later - it starts! What's that all about?

I've changed the fuel pump circuit relay (p/n 09 049 4959) but no difference.

One of my sons-in-law suggests it may be to do with the imobilizer. Is this a candidate? If so what can be done about it?

All sensible suggestions gratefully received.

Thanks in expectation.

[Dazzler]

Have you tried a paperclip test yet??

[Grimble]

Hi Dazzler

No, what's that then?

[Grumpy]

Check that EML light works, then carry out the PaperClip test
iaw the following link:

http://www.omegaowners.com/forum/YaBB.pl?num=1189022687

Your symptoms are similar to what a failing Crank Sensor would
give. It will work cold, but when warmed up starts to fail.

But do the test and see what you get.

[Grumpy]

Dazzler beat me to it.  

[Grimble]

Thanks guys, I'll do it now.

Back soon.

[Grimble]

Codes: 73, 13, 145, 31

Where can I find what they mean?

[Grumpy]

There are some links on the 2nd post on the PaperClip
test.

There are also some here.

http://www.topbuzz.co.uk/

As your's is the old 2.0l 8 Valve, I would guess at using the
Bosch Motronic 2 digit codes which would seem to be the same
as the v6 models.

13 Oxygen sensor
31 No RPM signal
73 Oxygen Sensor
145 Incorrect Immobiliser Signal

As you can't test the 2.0l with engine running, I'm not sure if
you can get a code 19(incorrect crank sensor signal) with the
paperclip test??
Anyway, code 31 is a crank sensor fault that the V6's always show
up with the engine not running so you'll have to guided by the
Tech2 experts on here as to whether you can get the confirming
code 19 to show up on an 8V 2.0L.

The oxygen codes are showing that the sensor in your exhaust
is upsetting the ECU.

The immobiliser fault is showing an intermittant immobiliser fault.

[Grimble]

Thanks Grumpy.

I can understand the 31 as engine not running.

Re. 73 & 13, is it a case of replacing the sensors or can anything be done to rectify without replacement?

Re. 145, can the Immobiliser be immobilised/disconnected to see if problem goes away. If prob. persists can immob. be replaced?

[TheBoy]

Does the EML flash when it doesn't start?  Is it a RF or IR remote?

[Grimble]

EML remains on steady when trying to start.

Sorry, don't understand 2nd question.

[TheBoy]

EML remains on steady when trying to start.

Sorry, don't understand 2nd question.

The remote for unlocking, is it Radio Frequency or Infrared (black dome near sunroof)

[Grimble]

Thanks TheBoy

Radio Frequency. However, I had to replace the ignition barrel & key in March 06 and the central locking fob hasn't worked since. I have to unlock with door key and then insert & turn on ignition key to stop alarm. I lock with door key and that turns alarm on.

Is that any help?

[TheBoy]

Thanks TheBoy

Radio Frequency. However, I had to replace the ignition barrel & key in March 06 and the central locking fob hasn't worked since. I have to unlock with door key and then insert & turn on ignition key to stop alarm. I lock with door key and that turns alarm on.

Is that any help?

ok, if eml not flashing, not immobiliser related

[Grimble]

That seems to point the finger at the O2/airmass sensors then, unless you know of other poss. causes.