It sounds like how one acts when the kickdown lever is staying applied.
C6 downshifts when I let off the throttle
Basically the truck downshifts around 1500rpm when I let off the throttle while cruising.
It did this awhile back and got annoying so I switched out to a full manual vb. I hated that as well so I got a Cheetah vb and also switched from a green stripe modulator to a black stripe. Upshifts are nice but the downshifting is back. I tried adjusting the modulator in and out and it doesnt change much. What could be causing this?
It did this awhile back and got annoying so I switched out to a full manual vb. I hated that as well so I got a Cheetah vb and also switched from a green stripe modulator to a black stripe. Upshifts are nice but the downshifting is back. I tried adjusting the modulator in and out and it doesnt change much. What could be causing this?
1 - 9 of 9 Posts
It doesnt have one and the arm was removed and the hole was plugged.
hook a vacuum gage inline with the modulator source . take a reading when backing off throttle
Got good manifold vacuum? Have seen a C4 do similar , guy had hooked modulator to ported vacuum
I switched to a different vacuum port on the carb and it seems much better. Thanks.
That's one I've never come across but I can see it happening.Have seen a C4 do similar , guy had hooked modulator to ported vacuum
Took a little to figure out .. When the throttle closes vacuum drops to zero so trans thinks its at full load and downshifts ..
One I've come across more than once:
EGR valve hooked direct to manifold vac.
Hmm... I wonder why it runs so rough
EGR valve hooked direct to manifold vac.
Hmm... I wonder why it runs so rough
1 - 9 of 9 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
460 Ford Forum
A forum community dedicated to Ford big block owners and enthusiasts. Come join the discussion about performance, modifications, horsepower, tuning, build specifications, and more!
Full Forum Listing
Top Contributors this Month
View All
The Mad Porter
60 Replies
the_partman
33 Replies
PSIG
24 Replies
