Desmond Posted May 26, 2018 Share Posted May 26, 2018 Hi there. I have a 300TDI Discovery fitted with ZF automatic transmission. I noticed the engine RPM will drop tremendously i.e. from 3000RPM to 1800RPM when the gear shift from 3rd to 4th. The RPM then slowly increase from 1800RPM to more than 2500RPM then only I can accelerate again. To over come it, I usually manually shift it to 3rd, picks up enough speed and RPM then manually shift it to 4th. This only happens after then engine has warmed up. Please advise what is wrong. Thank you in advance. Quote Link to comment Share on other sites More sharing options...
Snagger Posted May 27, 2018 Share Posted May 27, 2018 It sounds like the torque converter is locking up as soon as 4th engages. That suggests a blockage or fault in the valve block inside the sump at the bottom of the unit. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted May 28, 2018 Share Posted May 28, 2018 What speed does fourth gear come in? Quote Link to comment Share on other sites More sharing options...
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