AFAIK there is (almost) no connection between the TCSA and the gulp valve.
They both have a connection to the inlet manifold, right enough, but that is
as far as it goes, the engine had the gulp valve long before it had the
TCSA. The TSCA uses the take-off from the inlet manifold, via the TCSA
solenoid on the firewall, to the distributor. The gulp valve uses another
tapping on the inlet manifold. The TCSA solenoid is wired back to a switch
on the gearbox. Haynes is incorrect in that it shows two switches wired in
series for the TCSA - a microswitch with no indication of what operates it,
and a 4th gear only switch which is shared with the overdrive. It is
possible that very late cars did have the microswitch in addition to the
original gearbox switch, with the microswitch operating the TCSA in 4th gear
only, and the original gearbox switch reverting back to 3rd and 4th for the
overdrive.
----- Original Message -----
From: "Paul Root" <proot@iaces.com>
To: <mgs@autox.team.net>
Sent: Wednesday, June 25, 2003 2:13 PM
Subject: TCSA
> So the vacuum hose goes from the manifold/gulp valve to this
> vacuum valve/solenoid thing called a TCSA (transmission control
> something). Can you tell I don't have John's book in
> front of me. Oh, Moss part number, 145-740 N/A.
>
> There are two wires running to it, red/yellow and black. The
> r/y goes to a micro switch, somewhere, and on the other end of that
> switch is a yellow that goes to overdrive gear switch on the tranny.
> Yes, even if you don't have an overdrive. I do know that's there.
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