vacuum modulator
Joined: Sep 2005
Posts: 27,893
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
I'm going to assume that this is a 350, 400, or PG....
No it will not shift until VERY high engine RPMs. The vacuum modulator is how the transmission "measures" engine load.
High vacuum = low load = driver is not demanding much at the moment = shift early.
Low vacuum (atmospheric) = high load = driver has foot on the floor = hold car in low gear as long as possible = "never shift".
Hook up the vacuum modulator. It has NO CHANCE WHATSOEVER of working right without it.
No it will not shift until VERY high engine RPMs. The vacuum modulator is how the transmission "measures" engine load.
High vacuum = low load = driver is not demanding much at the moment = shift early.
Low vacuum (atmospheric) = high load = driver has foot on the floor = hold car in low gear as long as possible = "never shift".
Hook up the vacuum modulator. It has NO CHANCE WHATSOEVER of working right without it.
Thread
Thread Starter
Forum
Replies
Last Post
Pac J
Tech / General Engine
3
May 17, 2020 10:44 AM
HoosierinWA
Tech / General Engine
5
Oct 7, 2015 10:15 AM
