700R4 TCC Solenoid bad? (limited EFI content)

[Programmer]

There's a couple things that could be doing this, I'll list them
in order of removal to check <g>:

1. Ignition system problem
2. Misadjusted TV cable
3. Filter problem (cracked neck, seal leak, split housing, plugged)
4. Converter clutch apply valve sticking
5. Turbine shaft "O" ring cut
6. Converter problem.

Sounds more like an ignition leakage problem. The shudder/rough running
engine could be there all the time, but it's only noticed when the converter
locks up, as the converter can absorb the vibes prior
to lockup.

Lyndon.
-----Original Message-----
From: Peter Gargano <peter at ntserver.techedge.com.au>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: March 14, 2000 3:59 PM
Subject: 700R4 TCC Solenoid bad? (limited EFI content)


>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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