[V8] A small quiz for the V8 inclined

[KeithT1967 at aol.com]

There are no common links between the cruise and downshift  functions.
 
 There are two things that make a V8 downshift. #1 is based on  throttle 
demand vs speed and current selected gear which is sent as a signal to  the 
tranny ECU from the Engine ECU. #2 is the full throttle switch on the  
throttle cable. This is why a V8 will make the aggressive two step downshift  
regardless of what mode the tranny is in if you stomp the throttle. Based on  
your description I'd guess your full throttle switch housing is broken  which 
requires replacement of the entire throttle cable assembly.
 
 On the cruise side, the most common problem I've seen is simply a  
selector assembly that's either worn out or dirty. Second most common is an  
unplugged hose at the vacuum actuator under the left dizzy. Third would be a  
broken plastic washer that attaches the actuator rod to the actuator.  


 
In a message dated 6/26/2011 1:44:37 P.M. Eastern Daylight Time,  
ed.kellock at gmail.com writes:

What  sensor input would you think might be used for both cruise control
function  and transmission downshifts?

When I have the 93 V8 in Sport mode the  transmission upshifts as expected,
but it won't make the more aggressive  downshifts that I have experienced in
the 94 V8, like down to 2nd at 55-60  or down to 1st at 30 or so.  The one
time it did downshift  aggressively in Sport mode, I was also able to get 
the
cruise control to  work, hence the search for some common link to help 
direct
my  troubleshooting.

Thanks for any and all  ideas!

Ed


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