700R4 TCC Solenoid bad? (limited EFI content)

[David Cooley]

Could also be a bad TPS that won't generate over 50% or so.



At 05:59 PM 3/14/00, you wrote:
>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.

===========================================================
David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
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