[Gmecm] TPS for diesel and now PCM Algorithm

[Jason M.]

The 700r4 I used came from an 1984 trans am (computer controlled carbureted 
305).  It has 2 pressure switches, One for shifting between 3-4 the other 
was neutral/park if I recall correctly.

I'm honestly not sure how the original diesel set up worked.  The original 
owner had a junkyard 350 gas engine put in during it's first couple years of 
life.  I bought the car from the 3rd owner, he had a junkyard T350 put in. 
Somewhere along that time the wiring to the transmission was removed.  I 
removed 8 pounds of wiring used for the diesel.  I've had the dash out, 
haven't seen the ecm but the car still has it's obdI connector.

Best I can tell the computer controls on this engine were for the egr valve, 
possibly TCC, and cruise control.  Haven't really cared enough to break out 
my 85 caprice service manual to find out more about the diesel set up

Jason.
----- Original Message ----- 
From: "Ne14RoxCJ" <ne14roxcj at comcast.net>
To: <gmecm at diy-efi.org>
Sent: Wednesday, January 18, 2006 2:46 PM
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm


> 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