Re: 700R4 TCC Solenoid bad? (limited EFI content)

["nacelp" <nacelp@bright.net>]

When's the last time you changed fluid, and filter?.
I don't know what they call it in Oz, but an additive for freeing sticky
auto tranny pistons.
Bruce

> My VN Commodore 3.8 V6 has a "Turbo Hydra-Matic 700R4" and has just
> one ECM connection - the TCC Solenoid (I'm sure this isn't news to most
> list members ;-) I had to look at my manual!...
>
> My wife mostly drives the VN to work in light traffic. I only get to drive
it
> when it's playing up, or on a long trip. Last weekend the car (apparently)
> had a problem with unlocking the TCC. When doing constant freeway speed
(say
> ~ 70 mph) and coming to a hill, there would be a point when you'd expect
> the TCC to unlock to get a few more revs (and torque) to make it up the
> hill. At this point the transmission seemed to try to unlock and
immediately
> lock up again, causing an oscillation at about 3-5 Hz - only cure was to
change
> back to 3rd (from OD to D on shifter) until over the hill!
>
> I swapped the ECU and this didn't make any difference - haven't had time
to
> check anything else (wife has car!). I'll swap/check the TCC solenoid
tonight:
>
> It seems like the TCC solenoid may be pulling in and then almost
immediately
> letting go - is this common, or do I have a hydraulic (ie. auto trans)
fault?
>
> Note that this problem is not apparent when accelerating (fast or slow) up
in
> the gears, only when the motor/ECU/transmission senses a load that would
cause
> a downchange/TCC unlock condition.
>
> All ideas greatly appreciated.
>
> regards, PG
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