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2.6 Auto gear box question

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mantaray:
The Omega was used today to collect a car from S.wales, 140 miles each way on dual carriageway/motorway averaging around 55-60mph.

On the way down, with an empty trailer, she seemed to not want to change up to top gear, and was sitting around 3500rpm, she would occasionally change up and the rpm would drop to around 2500, but before long she would change down again and up the revs went. This resulted in very poor MPG.

On the return journey, however, with a loaded trailer, she returned to normal and sat at 2500rpm most of the time, only changing down on a steep hill, and even dropped the revs to 2000 at one stage.

Any help into what may have caused this would be of great help.

Chris.

grifter:
Found similar with my 2.6, occasionally it would take ages to change up. Other times it would change up and down like a sports car. I'd guess first step is check oil level and condition. Mine was fine but I reckon the box behaves like this as it controlled by computer and is adaptive. I find sometime I have to take revs up to 5500rpm and then it will change up.

Kevin Wood:
The shift points are software controlled and if the gearbox doesn't change when commanded to by the ECU, it'll put the gearbox warning on and store some faults. Best you can do is to ensure you have the latest gearbox ECU firmware.

Also bear in mind that the engine wion't pull as well in really hot weather so it's going to change down a bit earlier.

mantaray:
Didn't get any warning lights, and has never done this before, just felt like it was in 4th and didn't want to change into 5th.

robson:
Do we have 6 gears on a 2.6?

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