[Gmecm] TPS for diesel and now PCM Algorithm

[Ne14RoxCJ]

My '85 Blazer's 700R4 has 3 or 4 pressure switches on the valve body. One is
closed when in 4th gear, one unlocks the TCC before the trans downshifts
from 4 to 3 (manual downshift). Doesn't the 200R4 have a lock-up converter
also? How did the '82 Caprice diesel handle TCC control? The throttle
switch? That may be the thing to look for on this app. Like Steve said, the
vacuum on a gas engine is an indicator of load. The diesel's vacuum pump
supplies a constant vacuum to control HVAC and cruise, etc. It does not vary
with engine load.

Beau

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Jason M.
Sent: Tuesday, January 17, 2006 8:40 PM
To: gmecm at diy-efi.org
Subject: Re: [Gmecm] TPS for diesel and now PCM Algorithm

The 700r4 won't let the TCC lock in 1st.  I have the one in my 82 caprice 
set up with an arming switch on the dash, brake switch to interrupt during 
braking.  The car was a diesel with 2004r, it also has a throttle switch 
that I have thought about hooking up but the current set up works good 
enough.

As for operation with the switch on, accelerating 1st gear has no TCC lock 
up, 2nd gear with light throttle the TCC can lock up, I'm not sure of the 
mechanism but say the 2nd shift happens at 15mph under light throttle at 
20mph the clutch locks.  When it hits 3rd the tcc locks no matter what, same

as 4th.  There is a 3-4 switch in mine that disengages the TCC during the 
3-4 shift.

Generally I don't "arm" the TCC circuit until 30mph

And yes I will say this, the way I have it hooked up is no where near the 
best way, just an Ok way to do it.  It is a cheap easy way to get the clutch

working though.
----- Original Message ----- 
From: "Ne14RoxCJ" <ne14roxcj at comcast.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, January 17, 2006 8:33 PM
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm


> You could do without the 4th gear switch if you wanted to lock-up in lower
> gears (burnout in 1st or 2nd?) Not recommended, but I have heard of it.
> Definitely use the brake switch to open the circuit for safety. Stopping
> with the TCC locked would be like stopping a manual without pushing the
> clutch in. this is all really primitive, and probably not recommended by 
> any
> transmission builder, but it works. I still like the vacuum switch if
> possible. The wiring in the valve body changes so much between years and
> models, I can't say for sure, but one side of the TCC solenoid should be
> grounded and the other side should be the switched power. Hard to say how
> your 700R4 is wired without taking the pan down.
> Beau
>


_______________________________________________
Gmecm mailing list
Gmecm at diy-efi.org
http://lists.diy-efi.org/mailman/listinfo/gmecm