Kickdown switch stuck closed or kickdown solenoid is stuck in activated
position. Both of those match your symptoms 100% and other defects
would have other symptoms. What gives it away is the car dropping into
first when leaving a stop. That is activated by the kickdown mechanism
or by manually downshifting the shift selector. Bowden cable should not
activate 1st on the 722.3xx.
Quick test: remove the electrical connector at the kickdown solenoid.
Passenger side, tail of the trans., single round connector in black
plastic. If the problem stops, look to the switch, if not look to the
solenoid.
Regards,
Mathieu Cama
Old World Automotive
Lawrenceville, GA
www.oldworldauto.com
404-550-8000
9:30 AM - 5:30 PM Mon-Fri
On May 15, 2009, at 9:34 AM, Jim Cathey wrote:
Also as I recall their is a one valve assembly which has different
springs
for first gear start. thus if the seals on this value is bad or
sticking it
can cause problems.
I can say that I'm pretty sure I feel it drop into 1st from 2nd
when leaving a stop, and that with the cable loosened it definitely
wants to jump through the higher gears faster than optimal, though
you don't have to release the pedal as much (or at all, at lighter
takeoffs) to get it to shift out of first. Forward engagement time
is a second or less, reverse somewhat longer. Any kind of exuberant
takeoff results in bouncing off of redline, until you release the
throttle to get it into higher gears, then you can mash it again.
Usable, but irritating, and not something I really want to hand
off to my wife to drive, which was the original point.
No suggestions? Don't really want to double the price of the
car with a replacement tranny, and besides it seems to shift well
except for its 'separation anxiety'. Not afraid to dive into
things, if I know what to expect and have some idea of what I'm
doing. Valve body R&R? Easy. Valve body surgery? Would be
my first time! Can't be any worse than taking apart (and
reassembling into working condition) the dial bar of an old
Friden rotary calculator, which I did as a youth.
But _what_ to be doing, that is what I lack.
-- Jim
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_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
