Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

151

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 19:30:54 »

You can have the one I’ve got here if you want it. It’s a genuine GM one and will get you on the road quickly.

Happy to install it for you, it would be prudent to do the wiring tests at the same time.

I also have a theory that perhaps if the fuelling was wrong, maybe the 02 sensor heater was running constantly and has burnt itself out - I believe it’s only meant to run for short periods when the car is in open loop

152

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 19:25:17 »

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

Are you sure mate? That’s a square plug which I think was phased out on facelift models. Mig’s Omega will have the later style oval connectors

100%

My '54 3.2 had the square plug. Which makes it really easy to confuse with the charcoal pcv plug.

This is the one from my 2003 2.6 CDX. Definitely oval (the cars in bits so it was easy to check)

153

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 19:09:19 »

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 well be a £10 solution

154

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 19:07:49 »

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

Are you sure mate? That’s a square plug which I think was phased out on facelift models. Mig’s Omega will have the later style oval connectors

155

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 19:06:42 »

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 ….

156

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 16:31:51 »

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!)

157

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 15:45:49 »

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 

158

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 14:58:49 »

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

Engine off
Engine just started
Engine fully hot

159

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 14:55:34 »

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!

160

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 08:55:41 »

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

161

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 08:51:44 »

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 

162

Omega General Help / Re: What does this pipe do?

« on: 13 March 2023, 08:45:36 »

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

163

Omega General Help / Re: What does this pipe do?

« on: 12 March 2023, 17:50:22 »

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!

164

General Car Chat / Re: One for TB’s “list”?

« on: 10 March 2023, 14:53:47 »

Silly fricker 

What struck me moreso is an Omega with only 32k on the clock!!!

165

General Car Chat / One for TB’s “list”?

« on: 10 March 2023, 14:30:57 »

Saw this post on the Omega Owners Facebook group today.

An Omega driver is filming himself driving at speeds of up to 70mph on a two way road in an attempt to demonstrate a misfire.

Please god tell me nobody on here is that daft