Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: cjackel492 on 28 January 2015, 23:25:10
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I've been having a few issues with the auto on my 3.0 Omega.
While driving at certain speeds, if I come off the accelerator and then put my foot back on it, even if I wait a while or do it gently, the gearbox changes down 2 gears and then realises I didn't want to change gear and changes back up.
All the time I keep my foot on the accelerator, it's fine.
At 70mph, it's fine, 50-60 it does it all the time (country road driving).
And it is getting worst.
I have done a gearbox fluid change and cleaned the filter (oil smelt burnt) but hasn't had any effect.
I'm guessing it's the AR35 box as it's a 3.0?
Carl,
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Was the level correct when you refilled it? Engine must be running and box upto temp with the car level to check it properly...
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Was the level correct when you refilled it? Engine must be running and box upto temp with the car level to check it properly...
Yes, Level was ok, before I changed it and after.
Weird not having a dipstick to do it by..
Carl,
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Could be a failing shift solenoid then... would need a tech 2 session to check everything is working as expected :-\ but 95% of autobox issues are down to fluid level/quality...
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A mechanic's suggested it could be the pump not being able to maintain pressure causing the change down.
:(
Looks like replace or re-con it's gona have to be.
Carl,
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What was the condition of the old filter ?
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What was the condition of the old filter ?
Was quite dirty, No metal filings thou (on the magnet).
Carl,
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Have a read of this...
http://www.omegaowners.com/forum/index.php?topic=90460.0
And this...
http://www.omegaowners.com/forum/index.php?topic=90554.0
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That's left me confused, lol.
Carl,
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I've been having a few issues with the auto on my 3.0 Omega.
While driving at certain speeds, if I come off the accelerator and then put my foot back on it, even if I wait a while or do it gently, the gearbox changes down 2 gears and then realises I didn't want to change gear and changes back up.
All the time I keep my foot on the accelerator, it's fine.
At 70mph, it's fine, 50-60 it does it all the time (country road driving).
And it is getting worst.
I have done a gearbox fluid change and cleaned the filter (oil smelt burnt) but hasn't had any effect.
I'm guessing it's the AR35 box as it's a 3.0?
Carl,
Thats normally a sign the fluids not been changed for a very long time , obviously not good .. mite be worth unplugging ecu for a while then try again . Any shiny metal filings found ?
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Search on here for autobox problems :y
Possibilities are:
Incorrect fluid level.
Incorrect fluid type.
Thrust washer wear/damage.
Solenoid failure.
Selector switch water/dirt ingress.
Incorrect fluid level.
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Are you getting an auto box warning on the MID?
If the box ever ends up in a gear other than the one the electronics has commanded it to be in, you will get a fault reported by the ECU and it'll probably go into limp mode.
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I've been having a few issues with the auto on my 3.0 Omega.
While driving at certain speeds, if I come off the accelerator and then put my foot back on it, even if I wait a while or do it gently, the gearbox changes down 2 gears and then realises I didn't want to change gear and changes back up.
All the time I keep my foot on the accelerator, it's fine.
At 70mph, it's fine, 50-60 it does it all the time (country road driving).
And it is getting worst.
I have done a gearbox fluid change and cleaned the filter (oil smelt burnt) but hasn't had any effect.
I'm guessing it's the AR35 box as it's a 3.0?
Carl,
Thats normally a sign the fluids not been changed for a very long time , obviously not good .. mite be worth unplugging ecu for a while then try again . Any shiny metal filings found ?
No metal on the magnet.
Search on here for autobox problems :y
Possibilities are:
Incorrect fluid level.
Incorrect fluid type.
Thrust washer wear/damage.
Solenoid failure.
Selector switch water/dirt ingress.
Incorrect fluid level.
Did do a search, nothing similar came up.
Are you getting an auto box warning on the MID?
If the box ever ends up in a gear other than the one the electronics has commanded it to be in, you will get a fault reported by the ECU and it'll probably go into limp mode.
No Warning message on the GID
While it started doing it, thought it might have been something to do with kick down..
Carl,
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Kickdown switch :-\
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Could try unplugging the kickdown switch and see if the symptoms go away :-\
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Looking at the TIS, there isn't a kick down switch, I'm assuming it gets accelerator position from the engine ECU as there are 2 com's wires.
Carl,
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Have a look here - Kickdown switch removal (http://workshop-manuals.com/vauxhall/omega-b/k__clutch_and_transmission/automatic_transmission_rear_wheel_drive/automatic_transmission_ar_25/35/repair_instructions/kickdown_switch_remove_and_install_%28vehicles_with_4-cylinder_petrol/v6_engine%29/) ;)
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Looking at the TIS, there isn't a kick down switch, I'm assuming it gets accelerator position from the engine ECU as there are 2 com's wires.
Carl,
What engine is in your car? Does it have a throttle cable?
2.5/3.0 as per Dbugs link... kickdown switch is built into the throttle cable...
2.6/3.2 engine ecu sends throttle position info to gearbox ecu...
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Says 2001 3.0 Elite on ops profile ;)
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Says 2001 3.0 Elite on ops profile ;)
Agreed, but why the TIS reference to no kickdown switch :-\
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Looking at the TIS, there isn't a kick down switch, I'm assuming it gets accelerator position from the engine ECU as there are 2 com's wires.
Carl,
What engine is in your car? Does it have a throttle cable?
2.5/3.0 as per Dbugs link... kickdown switch is built into the throttle cable...
2.6/3.2 engine ecu sends throttle position info to gearbox ecu...
It's the 3.0 which isn't covered by the TIS so I made an assumption (and we all know what assumption's are..) that the 3.2 must be the same.. Opps..
Will look into switch.
Carl,
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Switch is located between the egr valve and the plenum :y
It's part of the throttle cable so diagnostically all you can do is unplug the switch or change the cable...
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There is a kickdown switch.
Additionally has the MPG dropped since this has started, as it may be a symptom of the engine being under more load for an unrelated reason.
The speeds quoted are in that range of changedowns if needing to accelerate more than at a tunnie pace. Remember, he TC unlocks, then it changes down. This may feel like 2 change downs (and the change up and TC lock may feel like 2 change ups). At 60mph, 2nd gear will be about 4.5k rpm