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[Timw976]

Evening Gents,

Thanks for all the advise that you've given me over the last week, unfortunately I'm back at square one so I'm hoping that someone might have a flash of inspiration!!!

Symptoms.....

When starting car will struggle to start, but always will start if not a little lumpy. The MIL light
Also illuminates but the car doesn't go into limp mode. The next time it's started it may start fine but the MIL light remains and this circle continues

I have had the cam sensor changed as advice on OOF and it was for a genuine sensor, no change in symptoms.

I have found a really good mechanic (loads of diagnostic kit etc) and the codes read were P0700, P0727 and P1781. After using 3 different diagnostic machine he finally concluded that it was either the wiring to the transmission control module or the module itself.

He has cleaned all the plugs etc which had evidence of water but the fault was still there. He has now said that the selector switch needs changing and also the transmission control module.

Now, I know he's not ripping me off as he's not supplying parts and he's not adding more to the labour bill, my question is can the transmission control module or the selector switch really cause the car to struggle when starting or am I going to end up changing more parts to cure the problem

Finally I do have another option which is to scrap the omega and buy a Volvo, opinions and advise are all welcome

Thanks again everyone


Tim

[Gaffers]

Stuck EGR?

[Timw976]

I didn't think about egr, but if it was that would the car not be in limp mode??? I might be wrong just thinking a out the be teas we had at work and had loads of issues with egrs not sure if its the same with omega or not!!!

God this car is stressing me now!!! Thinking the scrapage route might just looming lol

[Timw976]

Ok one other thing I've just thought of, when starting the car surely the gearbox or its transmission module is not doing anything so it realistically can't cause the laboured starting etc......can it??

[feeutfo]

They do seem to be linked, as cam sensor faults upsets the gear box with stunning regularity. So there a defo connection between engine and gear box ecu's... Well, there would have to be, as the two work in unison.

Just humour me for a minute, but when you get a chance, check the large electrical connector blocks rear of the battery are secure. It's a long shot...

[Timw976]

Hi Chris

Thanks for your reply, the connections are all secure and clean. Tbh I think it's a sensor somewhere but can't figure out which one

Think I'm losing the will to live lol

[Keith ABS]

  This may be a long shot, but is the car an auto and have you recently changed the ht leads. I ask as on the auto 24v carlton/senators, cheaper leads would upset the auto gearbox ECU.
keith B

[Timw976]

Hi Keith

Ht leads not been changed, only things been changed are cam belt kit 3k ago and cam sensor 4 days ago to try and cure this problem

Mechanic is changing transmission control module and switch selector today because when he took the control module plug off it was green from water and when he removed the selector switch water came from that as well

Cheers

Tim

[Marks DTM Calib]

Not good this, willy nilly part changing is a bad approach (it adds more unknowns to the system).

As already mentioned, feel free to pop it round for an actuator test and proper electronic diag

[Marks DTM Calib]

You do realise the transmission control module is behind the dash on the drivers side.

[Timw976]

Hi Mark,

Had an auto electrician round (Vauxhall Specialist), he read the codes on a Tech 2, a Launch diagnositics and a Bosch wireless auto data machine. They all showed the same. When he took the plug off the side of the gearbox water came pouring out, he took off the switch selector and water came out of that aswell.

I've decided to go all the way with it now, so I've bought a new Gearbox Transmission Module, Selector Switch, another genuine Vauxhall Cam sensor (just in case ive got a faulty one) and a new Crank Sensor.

Its all being fitted today and if that dont work then its being torched and used as a BBQ!!!

Cheers

Tim

[Steve B]

Hi Mark,

Had an auto electrician round (Vauxhall Specialist), he read the codes on a Tech 2, a Launch diagnositics and a Bosch wireless auto data machine. They all showed the same. When he took the plug off the side of the gearbox water came pouring out, he took off the switch selector and water came out of that aswell.

I've decided to go all the way with it now, so I've bought a new Gearbox Transmission Module, Selector Switch, another genuine Vauxhall Cam sensor (just in case ive got a faulty one) and a new Crank Sensor.

Its all being fitted today and if that dont work then its being torched and used as a BBQ!!!

Cheers

Tim

your making a big mistake here

[Timw976]

Which bit? Torching it? lol

Ive had 6 diagnostics run on the car, i've had a genuine vx cam sensor, vx have looked at it, local mechanic has looked at it for 3 days and now the auto electrician.

Gotta have faith that by eliminating the obvious ie. crank and cam sensors and selector switch and by getting rid of the water around the gearbox module that i'll be getting somewhere

[Kevin Wood]

Yep, a load more parts thrown at it to add confusion. Your specialist may have all the tools (not sure why he's using so many, a Tech 2 alone will tell him all he needs to know) but he's not listening to what it's telling him.

Those codes relate to problems with CAN communication between engine and gearbox ECU, so no problems with the selector switch and gearbox ECU (which isn't under the car anyway, as said). Is this "gearbox transmission module" something else, perhaps? The CAN connection is made through the body wiring loom that goes straight through the bulkhead, so the connectors under the car by the gearbox aren't related to this. Sometimes, one of the large, round connectors behind the battery can cause issues here. Have they been checked?

In my experience, these codes do get flagged on the gearbox spuriously sometimes when there is a fault with the engine such as a cam sensor. They always clear again once the engine problem is fixed. A gearbox problem won't stop the engine starting reliably so we're barking up the wrong tree trying to fix gearbox issues anyway. Fix the engine issue first. Often this is the cam sensor on a 2.2 but not always. Time to have a look at the live data from the engine ECU with a Tech 2. If your guy is as good as he says he is, he would have found a clue there. Take it to Mark, as suggested.

[Timw976]

Id love to get it over to Mark, but the car is on axle stands at the minute.

My only option now is to put these bits on and once its rebuilt if the codes are still there or the fault remains then get it over there. As a non vehicle techie you can really only go on what these people tell you.

The auto techs reputation is very good but obviously as you say........i might be throwing good parts after bad. If this is the case then I wont be an Omega driver much longer lol