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[JamesV6CDX]

Re the small vacc pipe, I remember noticing this during the cambelt change, but because it was so mangled and brittle I think we planned to sort it another time. If I forgot that then my apologies.

The threshold codes can genuinely be ignored. They do no harm and don't alter the running at all - they are a feature, not a fault!

The lambda related fault, was never going to be with the ECU. The ECU's are ultra reliable.

I still suspect a break in continuity in the loom. If the ECU is ok, and the sensor is OK, there isn't much left. The heater open circuit code is fairly cut and dry. Usually it's a failed lambda, and then after that, an issue with the heater wire.

We can probably identify which one it is (and which ECU pin) from the wiring diagrams on here

We can work together to fix this, please don't scrap her - she's a lovely example, especially now she's sporting a top notch AR35, and is all cambelted, etc!

As always, I am happy to pay you to take a look James. 

No payment is required, let's get this fixed and get you back in love with the Omega

[JamesV6CDX]

I've not touched my Omega really, since October, apart from fitting the new Rad. I went outside yesterday for half an hour, and fitted the rear cambelt cover and a couple of the cam sprockets. It just made it take shape a little bit, and gave me a bit of motivation to carry on fixing it

My plan was to actually install the cambelt kit too, but my bloody T50 socket broke whilst torquing up the number 2 cam wheel....... so at 4pm on a Sunday, with no inclination to look through my "spare sockets box", that was game over 

[JamesV6CDX]

The following is the wiring detail for all four sensors.

32 B1S2
Pin 1 Grey.
Pin 2 Green X85/50.
Pin 3 BrownBlack X85/60.
Pin 4 Blue X85/28.

36 B2S2
Pin 1 Grey.
Pin 2 Green X85/18.
Pin 3 BrownBlack X85/22.
Pin 4 Blue X85/44.

79 B1S1
Pin 1 Grey.
Pin 2 Green X85/34.
Pin 3 BrownBlack X85/55.
Pin 4 Blue X85/23.

91 B2S1
Pin 1 Grey.
Pin 2 Green X85/2.
Pin 3 BrownBlack X85/7.
Pin 4 Blue X85/39.

Pin 1 Grey is common to all four O2 sensors, the crank/cam /throttle position sensors, and is fed from FV3, through relay K114 and the 4mm RedBlue wire that runs through X3 and into the engine loom.

The ECU plugs are dismantle able for rewiring purposes.

This is immensely helpful info, and I will refer to it if I end up doing any wiring tests on Mig's old girl. Thanks a million Doc

[Migalot]

Re the small vacc pipe, I remember noticing this during the cambelt change, but because it was so mangled and brittle I think we planned to sort it another time. If I forgot that then my apologies.

The threshold codes can genuinely be ignored. They do no harm and don't alter the running at all - they are a feature, not a fault!

The lambda related fault, was never going to be with the ECU. The ECU's are ultra reliable.

I still suspect a break in continuity in the loom. If the ECU is ok, and the sensor is OK, there isn't much left. The heater open circuit code is fairly cut and dry. Usually it's a failed lambda, and then after that, an issue with the heater wire.

We can probably identify which one it is (and which ECU pin) from the wiring diagrams on here

We can work together to fix this, please don't scrap her - she's a lovely example, especially now she's sporting a top notch AR35, and is all cambelted, etc!

As always, I am happy to pay you to take a look James. 

No payment is required, let's get this fixed and get you back in love with the Omega

As soon as possible, James. Let me know when you are free! 

I really am happy to pay you, if not for the work, then most certainly for your fuel costs – preferably for both!

[JamesV6CDX]

I’ll be in touch very soon mate. In the meantime before I come please can you do me a favour. The engine MUST be stone cold for this

Using your fancy Bluetooth scanny thing, can you bring up the live data before the first start of the day, (so engine off and stone cold, but ignition on). 

Find the value for coolant temperature sensor. Check that it’s reading at (or slightly above) the ambient outside temperature with a cold engine. (Make a note)

Then turn on the car, let it idle, and keep watching the coolant temperature reading. Run it to the point the fans kick in, and record the temperature again.

Also note any trends in the middle - eg, it should just go up a bit at a time with no huge rises or falls.

It might be in your live data as “CTS” or “coolant temp” or similar.

My thinking is that a faulty / erratic CTS can cause problems with the engine going from open to closed loop, which can make lambdas rather unhappy!

[JamesV6CDX]

Additionally, please could you also note the MAF / Mass Air Flow reading at the following times

Engine off
Engine just started
Engine fully hot

[Doctor Gollum]

Fancy code reader question...

You do realise that the Omega isn't OBD2

[JamesV6CDX]

Fancy code reader question...

You do realise that the Omega isn't OBD2

Mig has a Vauxhall specific Bluetooth jobby - I’ve seen it do basic live data

I also have a poor man’s Tech2 

[Migalot]

Hi James,

More than happy to do the readings as you suggest. Have just used the car and may be out to the shops later, so will do them tomorrow.

For what it's worth I took screenshots when I started the car yesterday. They may be of vague interest!

[JamesV6CDX]

Was this immediately after start?

It’s showing an ambient outside temp of 9degrees and the coolant temp at 42 degrees!

If this was immediately upon starting, then your coolant temp sensor is goosed and will play hell with the fuelling (and hence lambdas!)

[Migalot]

Was this immediately after start?

It’s showing an ambient outside temp of 9degrees and the coolant temp at 42 degrees!

If this was immediately upon starting, then your coolant temp sensor is goosed and will play hell with the fuelling (and hence lambdas!)

Yes. You can see by the RPM, it hadn't even settled down to 600RPM.

[Migv6 le Frog Fan]

That could be the solution to the problem then by the sound of it. If so, happy days. 

[Migalot]

your coolant temp sensor is goosed and will play hell with the fuelling (and hence lambdas!)

Like this one?

https://www.eurocarparts.com/p/starline-coolant-temperature-sensor-22488006s

[Doctor Gollum]

your coolant temp sensor is goosed and will play hell with the fuelling (and hence lambdas!)

Like this one?

https://www.eurocarparts.com/p/starline-coolant-temperature-sensor-22488006s

Almost certainly not.

That's to say the guide applies to the 2.5/3.0.

You want this one.

https://www.ebay.co.uk/itm/283556554341

[JamesV6CDX]

Was this immediately after start?

It’s showing an ambient outside temp of 9degrees and the coolant temp at 42 degrees!

If this was immediately upon starting, then your coolant temp sensor is goosed and will play hell with the fuelling (and hence lambdas!)

Yes. You can see by the RPM, it hadn't even settled down to 600RPM.

In that case, your coolant temp sensor is totally ficked!

Incorrect CTS readings will play hell with some of the other sensors - particularly lambda, and will affect the fuelling.

It’s a known problem which needs to be fixed, and is highly likely to be linked.

It could very be a £10 solution ….