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My 1990 740's overdrive will engage by itself sometimes when I start the engine and at other time when driving. The problem is that after it engages the overdrive, it refuses to disengage and I have to go on 3rd gear until it decides to disengage, also by itself.
This has certainly resulted in unnecessary high fuel consumption. Please knidly advise what is wrong and how do I go about solving this problem? Would it help if I permanently disable the overdrive as I hardly uses it? If so, how do I permanently disable the overdrive?
Many thanks.
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