Vacuum diagrams and coolant pipes and connectors

[Aristides (Aristides Balanos)]

@MoongloAuto

I guess these things don’t have much power or the trans has to learn shift patterns because I got on the highway and punched it and it didn’t kick down a gear. Just stayed in whatever gear it was in.

Doesn’t the 89 V12 still has the TH400? No trans ECU, just the vacuum modulator and the kick down switch.
The switch is at the throttle pedestal, activated by the depression of the throttle cable with distinct feal at the pedal. It might be stuck, or the switch disconnected or broken. Easy to check.

PS
there are two switches at the pedestal, the other is the Fuel Enrichment.

Throttle pedestal microswitch substitute

Doing the wrong move, I accidently touched the spades and the fuel enrichment microswitch literally exploded… ! [IMG20220510201243] This is a inexpensive direct fit made by Omron. The kick-down switch is also the same, so I changed it as well. [IMG20220510201332] The lever is a bit flimsier than the Burgess, but works fine.