Bah ! gearbox has gone...again !

[Joelchester]

Just went in ‘neutral’ (no drive) after going over a speed bump (slowly!) P,locks the wheels,everything else is freewheelin’ ,so here we go again,last time it cost £450 for a new forward clutch pack,think I may have to go FULL RECON this time (never go full recon) he quoted about a grand four years ago,let’s hope it ain’t gone up ! (97’ 840) this one...


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[Joelchester]

Ok then,it turns out it had snapped the main shaft in the gearbox,so he replaced that and put a new pump in....£550 (bargain) However,if I give it a ‘bootfull’ (hard acceleration) on the motorway,it won’t change down ! I can change with the tiptronic into 5th,but otherwise it just stays in third or fourth....it WAS doing this before the gearbox went,any ideas ? Is it a ‘kick down’ adjustment or something...it’s fine when just cruising....cheers,Joel.


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[Timm]

The usual cause is gearbox excessive temperature as measured by the sensor within the gearbox. To reduce torque the EGS locks out 4th and 5th. This is often a failure of the sensor itself rather than real over-heating.

The best plan is to use INPA to read the live data from the gearbox before the car is started - and see if the temperature is raised (probably a faulty sensor) or normal (possibly the gearbox cooler is blocked with leaves).

[toomanyparts]

Has the valve body ever been serviced?

[Joelchester]

Cheers Tim,will check it out,dunno if the valve body has been serviced,I’ll give the geezer a bell next week....this not changinging up thing has happened in the past, but normally when the rear tyres are low on air....weirdly...


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[Timm]

That's not weird - that's normal behaviour - it is designed to stop gear changes when turning sharp corners as the gear-change might destabilise the car. If you have a tyre that has a much lower pressure compared to the other on the same axle, the EGS thinks the car is turning a corner as the deflated tyre rotates faster - so make sure tyres on an axle have the same pressure and rolling diameter!

[72tpik5]

Sorry I can't help with your transmission woes, but I have to say, I am really digging this picture.

[Joelchester]

That's not weird - that's normal behaviour - it is designed to stop gear changes when turning sharp corners as the gear-change might destabilise the car. If you have a tyre that has a much lower pressure compared to the other on the same axle, the EGS thinks the car is turning a corner as the deflated tyre rotates faster - so make sure tyres on an axle have the same pressure and rolling diameter!

Clever buggers.....my car is ‘alive’ ha,ha...


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