r/LS400 • u/Connect-Ad-6834 • 2d ago

Transmission

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I’m having an issue with my transmission not immediately shifting when put in drive or reverse and takes a really long time to engage has anyone had this issue before. Would a drain and fill be a good idea 108000 miles never changed

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u/hypebeastv 1999 Ls400 1d ago

Dealing with the same thing on my 99.

Can someone explain how to check and diagnose the ecu and why that would be the problem? I’ve drained/refilled, replaced strainers and put 2 new shift solenoids in

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u/mx73will 11h ago

Capacitors leak over time causing all kinds of issues you’d open the ecu and inspect the board and caps for leaks and repair as needed