Bmw523i. Y does auto trans stick in 4th gear even when takin foot off acc 80mph 5000rpm acc slow goes thru gea
Answers:
The first thing to check is the transmission fluid level. I believe on your car, you have to remove the bolt from the top up hole and add transmission fluid until it starts to overflow.
The reason I think it's this is because accellerating will wincrease the oil pressure in the 'box enough to change up but when you take your foot off, there is not enough reserve fluid to activate the change down.
Whatever the case, this is always check 1 in the mechanic's handbook.
sounds like valve block in the gearbox is sticking has the box ever been serviced?usually one of the things that tends to be neglected on a otherwise looked after car. also get a diagnostic done on the box could be a sensor gone down as it is controlled by its own ecu
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