ashbash2403
New Member
Not read all the pages... but I have Rev Drop when in R or D and had the hot stall issue where it would just keep dropping when out and about. This is a 1990 3.9 EFI.
I changed the Stepper/Idle and cleaned inside the chamber.
I also removed the Flame Trap and replaced it + cleaned out all 3 pipes from Flam Trap to T Piece, Pipe to Plenum and smaller pipe in to right side. My T Piece has a brass insert which was clogged and the trap and pipes were well crudded up.
Went through about 1 large can of brake cleaner doing this and sprayed anywhere in plenum I could and cleaned it all up.
Cleaned the pipe from the back of the idle valve which comes round to the back of the plenum as well.
Since then its been fine not changed the idle on the throttle.
Did try and remove the plenum but the allan key bolts are very very tight so did not risk it.
I changed the Stepper/Idle and cleaned inside the chamber.
I also removed the Flame Trap and replaced it + cleaned out all 3 pipes from Flam Trap to T Piece, Pipe to Plenum and smaller pipe in to right side. My T Piece has a brass insert which was clogged and the trap and pipes were well crudded up.
Went through about 1 large can of brake cleaner doing this and sprayed anywhere in plenum I could and cleaned it all up.
Cleaned the pipe from the back of the idle valve which comes round to the back of the plenum as well.
Since then its been fine not changed the idle on the throttle.
Did try and remove the plenum but the allan key bolts are very very tight so did not risk it.