Omega Owners Forum - Autobox delayed change-up when engine cold

Matchless

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Autobox delayed change-up when engine cold
10. Aug 2006 at 09:57

Does anyone know if this wonderful feature can be disabled?
My street is a fair distance from the main road and has parked cars, school kids, side streets etc so I drive gently along pulling 2700 rpm in first looking like I dont know how to change gear.
I have tried using the snow button which is OK except when I forget to switch it off again once I reach the main road.
There must be a way of knobbling this.

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Admin Administrator Offline Posts: 2660	Re: Autobox delayed change-up when engine cold Reply #1 - 10. Aug 2006 at 10:48 I think it is probably thermostatically controlled so fooling it should not be too difficult with the correct resistor. However, the sensor is probably in the gearbox.... I am sure a certain work colleague will know the answer!
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Matchless

Omega Knight

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Re: Autobox delayed change-up when engine cold
Reply #2 - 10. Aug 2006 at 11:06

The function is supposed to be to help warm up the cats so that the cats start to clean up the exhaust emissions more quickly following cold start.

I wondered if the engine ecu set a flag derived from coolant temp or commencement of closed loop fuelling or similar to tell the gearbox to revert to normal change points.
I doubt if the 'box ecu makes the decision based on its own temp etc.

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Admin Administrator Offline Posts: 2660	Re: Autobox delayed change-up when engine cold Reply #3 - 10. Aug 2006 at 12:42 Good point, I forgot it was used to improve the emission controls. I guess then it is triggered by close loop fuelling as that would make the most sense... well to me anyway! I now await a full and detailed explanation from Mark of the "benefits" of this system.
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Matchless Omega Knight Offline Posts: 1746 Nottingham Gender: Drives: The one at the end of the drive	Re: Autobox delayed change-up when engine cold Reply #4 - 10. Aug 2006 at 13:37 I did ask Mark....... He didnt know how it worked.
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Kev Omega Knight Offline .:The OmegaProject:. Posts: 1543 Glasgow Gender:	Re: Autobox delayed change-up when engine cold Reply #5 - 10. Aug 2006 at 14:07 Matchless wrote on 10. Aug 2006 at 13:37: I did ask Mark....... He didnt know how it worked. I find that astonishing! Are you sure?
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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: Autobox delayed change-up when engine cold Reply #6 - 10. Aug 2006 at 15:16 I will study the diagrams....you have to remember that up until recently my only Omega had the optional driver involvement pack (i.e third pedal.... ) Seem to recall a single connection to the auto box.
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Andy B Over Active Poster Offline Posts: 21988 Bury Lancs Gender: Drives: 1999 3.0 Elite auto/TDM	Re: Autobox delayed change-up when engine cold Reply #7 - 10. Aug 2006 at 16:53 Senators do/did this too.
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TheOutcast

Ex Member

Re: Autobox delayed change-up when engine cold
Reply #8 - 10. Aug 2006 at 17:46

Matchless wrote on 10. Aug 2006 at 09:57:

Does anyone know if this wonderful feature can be disabled?
My street is a fair distance from the main road and has parked cars, school kids, side streets etc so I drive gently along pulling 2700 rpm in first looking like I dont know how to change gear.
I have tried using the snow button which is OK except when I forget to switch it off again once I reach the main road.
There must be a way of knobbling this.

Mine changes up after less than 100 yards. If I take my foot off the pedal for a second it seems to encourage it to change up sooner, but that could be just my imagination
The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it.
You could let the engine tick over for a bit longer before you pull away. That's not good for the engine, but it might make the gearbox change up sooner.

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Andy B Over Active Poster Offline Posts: 21988 Bury Lancs Gender: Drives: 1999 3.0 Elite auto/TDM	Re: Autobox delayed change-up when engine cold Reply #9 - 10. Aug 2006 at 18:25 Quote: ..... The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it. Wrong! It works when you press it starting you off in 3rd gear! Air temp is nothing to do with it.
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Salty

Ex Member

Re: Autobox delayed change-up when engine cold
Reply #10 - 10. Aug 2006 at 20:55

Andy B wrote on 10. Aug 2006 at 18:25:

Quote:

.....
The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it.

Wrong! It works when you press it starting you off in 3rd gear! Air temp is nothing to do with it.

I think thats right, just not sure if its third you set off in? You should be able to activate it as long as your doing less than 30mph. I think its supposed to reduce the chance of wheelspin in slippy conditions

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Andy B

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Re: Autobox delayed change-up when engine cold
Reply #11 - 10. Aug 2006 at 20:58

Salty wrote on 10. Aug 2006 at 20:55:

.......
I think thats right, just not sure if its third you set off in? You should be able to activate it as long as your doing less than 30mph. I think its supposed to reduce the chance of wheelspin in slippy conditions

Definately 3rd you set off in. Reduces wheel spin cos .... you're in third! Roll Eyes

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TheOutcast

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Re: Autobox delayed change-up when engine cold
Reply #12 - 10. Aug 2006 at 22:33

Andy B wrote on 10. Aug 2006 at 18:25:

Quote:

.....
The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it.

Wrong! It works when you press it starting you off in 3rd gear! Air temp is nothing to do with it.

I stand corrected. Smiley

I've just been out to the car and tried it. You're right it does work.
I'm sure that on my old P Reg, it only worked in low temperatures. Perhaps they changed it, or perhaps I'm wrong about that too.

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TheOutcast

Ex Member

Re: Autobox delayed change-up when engine cold
Reply #13 - 10. Aug 2006 at 22:34

Quote:

Andy B wrote on 10. Aug 2006 at 18:25:

Quote:

.....
The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it.

Wrong! It works when you press it starting you off in 3rd gear! Air temp is nothing to do with it.

I stand corrected. Smiley

I've just been out to the car and tried it. You're right it does work. According to the handbook it switches off when you reach 80 KPH.
I'm sure that on my old P Reg, it only worked in low temperatures. Perhaps they changed it, or perhaps I'm wrong about that too.

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Kev

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Re: Autobox delayed change-up when engine cold
Reply #14 - 10. Aug 2006 at 22:35

Quote:

Andy B wrote on 10. Aug 2006 at 18:25:

Quote:

.....
The "Snow button" should only work when the air temperature is around freezing. If your's works in the summer, there's something wrong with it.

Wrong! It works when you press it starting you off in 3rd gear! Air temp is nothing to do with it.

I stand corrected. Smiley

I've just been out to the car and tried it. You're right it does work.
I'm sure that on my old P Reg, it only worked in low temperatures. Perhaps they changed it, or perhaps I'm wrong about that too.

Don't fret.

It's not like you're an Outcast. Wink

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